{"id":31029,"date":"2024-01-13T12:41:53","date_gmt":"2023-03-16T00:25:54","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-java-se-8-%e9%93%b6%e8%89%b2%e7%ac%94%e8%ae%b0\/"},"modified":"2025-08-12T21:56:58","modified_gmt":"2025-08-12T13:56:58","slug":"java-java-se-8-%e9%93%b6%e8%89%b2%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-java-se-8-%e9%93%b6%e8%89%b2%e7%ac%94%e8%ae%b0\/","title":{"rendered":"[Java] Java SE 8 \u94f6\u8272\u7b14\u8bb0"},"content":{"rendered":"<h2>\u8003\u8bd5\u6280\u5de7<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u8a2d\u554f\u3092\u3088\u304f\u8aad\u3080\u3053\u3068\uff08\u6b63\u3057\u3044\u3001\u8aa4\u308a\u3092\u30013\u500b\u306a\u3069\u306f\u898b\u843d\u3068\u3055\u306a\u3044\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5909\u6570\u306e\u578b\u3001\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u306f\u6ce8\u610f\u6df1\u304f\u78ba\u8a8d\u3059\u308b\u3053\u3068<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u578b\u306e\u4e0d\u4e00\u81f4\u3084\u30a2\u30af\u30bb\u30b9\u6a29\u9650\u306e\u554f\u984c\u306b\u8981\u6ce8\u610f<\/ul>\n<h2>Java\u7684\u57fa\u7840<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u7121\u540d\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u5c5e\u3059\u308b\u30af\u30e9\u30b9\u306f\u7121\u540d\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u5c5e\u3059\u308b\u30d1\u30c3\u30b1\u30fc\u30b8\u304b\u3089\u3057\u304b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">protected \u306f\u5225\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u30af\u30e9\u30b9\u3067\u7d99\u627f\u3055\u308c\u305f\u6642\u3001\u7d99\u627f\u3057\u305f\u30af\u30e9\u30b9\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u304c\u3001\u7121\u540d\u30d1\u30c3\u30b1\u30fc\u30b8\u306f\u30a2\u30af\u30bb\u30b9\u4e0d\u53ef(\u7121\u540d\u30d1\u30c3\u30b1\u30fc\u30b8\u306e\u5236\u7d04\u304c\u512a\u5148)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u968e\u5c64\u306e\u6982\u5ff5\u306f\u306a\u3044<\/ul>\n<h2>\u5bf9Java\u7684\u6570\u636e\u7c7b\u578b\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30ea\u30c6\u30e9\u30eb\u306b\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc(_)\u304c\u4f7f\u7528\u3067\u304d\u308b(\u4ee5\u4e0b\u306e\u5236\u9650\u3042\u308a)<\/ul>\n<\/li>\n<\/ul>\n<p>\u30ea\u30c6\u30e9\u30eb\u306e\u5148\u982d\u3068\u672b\u5c3e\u306b\u8a18\u8ff0\u3067\u304d\u306a\u3044(NG: _0)<br \/>\n\u8a18\u53f7\u306e\u524d\u5f8c\u306b\u4f7f\u7528\u3067\u304d\u306a\u3044(NG: 0_.0)<\/p>\n<p>\u5c0f\u6570\u70b9\u30ea\u30c6\u30e9\u30eb\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306f double<br \/>\n\u3053\u306e\u305f\u3081\u3001float \u306e\u5909\u6570\u306b\u30ea\u30c6\u30e9\u30eb\u3092\u4ee3\u5165\u3059\u308b\u5834\u5408\u306f\u3001\u578b(\u63a5\u5c3e\u5b50)\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"kt\">float<\/span> <span class=\"n\">f<\/span> <span class=\"o\">=<\/span> <span class=\"mf\">0.0f<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5909\u6570\u3001\u30e1\u30bd\u30c3\u30c9\u3001\u30af\u30e9\u30b9\u306a\u3069\u306e\u540d\u524d\uff08\u8b58\u5225\u5b50\uff09\u306f\u4ee5\u4e0b\u306e\u5236\u9650\u304c\u3042\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>\u4e88\u7d04\u8a9e\u306f\u4f7f\u3048\u306a\u3044<br \/>\n\u4f7f\u3048\u308b\u8a18\u53f7\u306f\u3001\u30a2\u30f3\u30c0\u30fc\u30d0\u30fc(_)\u3001\u901a\u8ca8\u8a18\u53f7($\u7b49)\u306e\u307f<br \/>\n\u6570\u5b57\u304b\u3089\u59cb\u3081\u3066\u306f\u3044\u3051\u306a\u3044<\/p>\n<p>byte \u578b\u306f 8\u30d3\u30c3\u30c8\u6574\u6570(-128\u304b\u301c127)<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"kt\">byte<\/span> <span class=\"n\">b<\/span> <span class=\"o\">=<\/span> <span class=\"mb\">0b1000000<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"err\">\u2192<\/span><span class=\"mi\">128<\/span> <span class=\"n\">\u306e\u305f\u3081\u30a8\u30e9\u30fc<\/span>\r\n  <span class=\"kt\">byte<\/span> <span class=\"n\">b<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"kt\">byte<\/span><span class=\"o\">)<\/span><span class=\"mb\">0b1000000<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"err\">\u2192<\/span><span class=\"o\">-<\/span><span class=\"mi\">128<\/span> <span class=\"n\">\u306e\u305f\u3081OK<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u4e0a\u4f4d\u306e\u578b(int \u3067\u3042\u308c\u3070 long)\u3078\u306e\u4ee3\u5165\u306f\u30ad\u30e3\u30b9\u30c8\u4e0d\u8981(\u30a2\u30c3\u30d7\u30ad\u30e3\u30b9\u30c8)<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"kt\">int<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"kt\">long<\/span> <span class=\"n\">b<\/span> <span class=\"o\">=<\/span> <span class=\"n\">a<\/span><span class=\"o\">;<\/span>\r\n\r\n  <span class=\"kt\">float<\/span> <span class=\"n\">f<\/span> <span class=\"o\">=<\/span> <span class=\"mf\">0.0f<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"kt\">double<\/span> <span class=\"n\">d<\/span> <span class=\"o\">=<\/span> <span class=\"n\">f<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u4e0b\u4f4d\u306e\u578b\u3078\u306e\u4ee3\u5165\u306f\u30ad\u30e3\u30b9\u30c8\u304c\u5fc5\u8981(\u30c0\u30a6\u30f3\u30ad\u30e3\u30b9\u30c8)<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"kt\">long<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"kt\">int<\/span> <span class=\"n\">b<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"kt\">int<\/span><span class=\"o\">)<\/span><span class=\"n\">a<\/span><span class=\"o\">;<\/span>\r\n\r\n  <span class=\"kt\">double<\/span> <span class=\"n\">d<\/span> <span class=\"o\">=<\/span> <span class=\"mf\">0.0<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"kt\">float<\/span> <span class=\"n\">f<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"kt\">float<\/span><span class=\"o\">)<\/span><span class=\"n\">d<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u30af\u30e9\u30b9\u306b\u95a2\u3057\u3066\u3082\u540c\u3058\u30eb\u30fc\u30eb<\/ul>\n<h2>\u7b97\u5b50\u548c\u5224\u65ad\u7ed3\u6784\u7684\u5e94\u7528<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">equal \u30e1\u30bd\u30c3\u30c9\u306f Object \u30af\u30e9\u30b9\u3067\u5b9a\u7fa9\u3055\u308c\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30c1\u30a7\u30c3\u30af(\u540c\u4e00\u6027\u30c1\u30a7\u30c3\u30af)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">String \u30af\u30e9\u30b9\u306e equal \u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6587\u5b57\u5217\u30c1\u30a7\u30c3\u30af\uff08\u540c\u5024\u6027\u30c1\u30a7\u30c3\u30af\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">equal \u30e1\u30bd\u30c3\u30c9\u3092\u30aa\u30fc\u30d0\u30e9\u30a4\u30c9\u3057\u305f\u554f\u984c\u304c\u3067\u305f\u5834\u5408\u3001\u4e0a\u8a18\u3092\u610f\u8b58\u3059\u308b\u3053\u3068<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u6587\u5b57\u5217\u30ea\u30c6\u30e9\u30eb\u306f\u30b3\u30f3\u30b9\u30bf\u30f3\u30c8\u30d7\u30fc\u30eb\u306b\u914d\u7f6e\u3055\u308c\u3001\u540c\u3058\u30ea\u30c6\u30e9\u30eb\u306f\u5171\u6709\u3055\u308c\u308b\u305f\u3081\u3001\u4ee5\u4e0b\u306e\u6761\u4ef6\u306f true \u3068\u306a\u308b<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"nc\">String<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"aaa\"<\/span>\r\n  <span class=\"nc\">String<\/span> <span class=\"n\">b<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"aaa\"<\/span>\r\n  <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">a<\/span> <span class=\"o\">==<\/span> <span class=\"n\">b<\/span><span class=\"o\">);<\/span>\r\n  <span class=\"err\">\u2192<\/span> <span class=\"kc\">true<\/span> <span class=\"n\">\u304c\u8868\u793a\u3055\u308c\u308b<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">if \u6587\u3067\u51e6\u7406\u3092\u6539\u884c\u3057\u3066\u66f8\u304f\u3068\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u4e2d\u62ec\u5f27\u3092\u9069\u5b9c\u4ed8\u4e0e\u3059\u308b(\u3072\u3063\u304b\u3051\u306b\u6ce8\u610f)<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"kt\">int<\/span> <span class=\"n\">num<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">10<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">num<\/span> <span class=\"o\">==<\/span> <span class=\"mi\">100<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"A\"<\/span><span class=\"o\">);<\/span>\r\n  <span class=\"k\">else<\/span> <span class=\"nf\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">num<\/span> <span class=\"o\">&gt;<\/span> <span class=\"mi\">10<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"B\"<\/span><span class=\"o\">);<\/span>\r\n  <span class=\"k\">else<\/span>\r\n  <span class=\"nf\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">num<\/span> <span class=\"o\">==<\/span> <span class=\"mi\">10<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"C\"<\/span><span class=\"o\">);<\/span>\r\n  <span class=\"k\">else<\/span>\r\n  <span class=\"nf\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">num<\/span> <span class=\"o\">==<\/span> <span class=\"mi\">10<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"D\"<\/span><span class=\"o\">);<\/span>\r\n\r\n<\/code><\/pre>\n<p>\u7f16\u8bd1\u5668\u7684\u89e3\u91ca<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"kt\">int<\/span> <span class=\"n\">num<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">10<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">num<\/span> <span class=\"o\">==<\/span> <span class=\"mi\">100<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"A\"<\/span><span class=\"o\">);<\/span>\r\n  <span class=\"o\">}<\/span> <span class=\"k\">else<\/span> <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">num<\/span> <span class=\"o\">&gt;<\/span> <span class=\"mi\">10<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"B\"<\/span><span class=\"o\">);<\/span>\r\n  <span class=\"o\">}<\/span> <span class=\"k\">else<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">num<\/span> <span class=\"o\">==<\/span> <span class=\"mi\">10<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"C\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span> <span class=\"k\">else<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">num<\/span> <span class=\"o\">==<\/span> <span class=\"mi\">10<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"D\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">switch \u6587\u306b\u6761\u4ef6\u304c\u6e21\u305b\u308b\u578b\u306b long, boolean \u306f\u542b\u307e\u308c\u306a\u3044!<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">switch \u306e\u6761\u4ef6\u306b\u5909\u6570\u306f\u4f7f\u3048\u306a\u3044<\/ul>\n<h2>\u521b\u5efa\u548c\u4f7f\u7528\u6570\u7ec4<\/p>\n<ul class=\"post-ul\">\u914d\u5217\u306e\u578b\u5ba3\u8a00\u3067\u8981\u7d20\u6570\u306f\u6307\u5b9a\u3057\u306a\u3044\uff08\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff09<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"c1\">\/\/ \u57fa\u672c\u5f62<\/span>\r\n  <span class=\"kt\">int<\/span> <span class=\"o\">[]<\/span> <span class=\"n\">a<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"c1\">\/\/ \u3053\u308c\u3060\u3081<\/span>\r\n  <span class=\"kt\">int<\/span> <span class=\"o\">[<\/span><span class=\"mi\">3<\/span><span class=\"o\">]<\/span> <span class=\"n\">a<\/span><span class=\"o\">;<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u914d\u5217\u306e\u521d\u671f\u5316\u3067\u8981\u7d20\u6570\u3068\u521d\u671f\u5024\u8a2d\u5b9a\u3092\u540c\u6642\u306b\u304b\u3051\u306a\u3044\uff08\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff09<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"c1\">\/\/ \u57fa\u672c\u5f62<\/span>\r\n  <span class=\"kt\">int<\/span> <span class=\"o\">[]<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"kt\">int<\/span> <span class=\"o\">[]{<\/span><span class=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"mi\">2<\/span><span class=\"o\">};<\/span>\r\n  <span class=\"c1\">\/\/ \u3053\u308c\u3060\u3081<\/span>\r\n  <span class=\"kt\">int<\/span> <span class=\"o\">[]<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"kt\">int<\/span> <span class=\"o\">[<\/span><span class=\"mi\">2<\/span><span class=\"o\">]{<\/span><span class=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"mi\">2<\/span><span class=\"o\">};<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u914d\u5217\u306e\u5ba3\u8a00\u3068\u521d\u671f\u5024\u8a2d\u5b9a\u3092\u5225\u306b\u304b\u3051\u306a\u3044\uff08\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff09<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"c1\">\/\/ \u57fa\u672c\u5f62<\/span>\r\n  <span class=\"kt\">int<\/span> <span class=\"o\">[]<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"kt\">int<\/span> <span class=\"o\">[]{<\/span><span class=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"mi\">2<\/span><span class=\"o\">};<\/span>\r\n  <span class=\"c1\">\/\/ \u3053\u308c\u3060\u3081<\/span>\r\n  <span class=\"kt\">int<\/span> <span class=\"o\">[]<\/span> <span class=\"n\">a<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"o\">{<\/span><span class=\"mi\">1<\/span><span class=\"o\">,<\/span> <span class=\"mi\">2<\/span><span class=\"o\">};<\/span>\r\n<\/code><\/pre>\n<h2>\u4f7f\u7528\u5faa\u73af\u7ed3\u6784<\/p>\n<ul class=\"post-ul\">\u7279\u306b\u6ce8\u610f\u70b9\u7121\u3057<\/ul>\n<h2>\u65b9\u6cd5\u548c\u5c01\u88c5\u7684\u64cd\u4f5c<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u53ef\u5909\u9577\u5f15\u6570\u5ba3\u8a00<\/ul>\n<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3059\u308b<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"kt\">void<\/span> <span class=\"nf\">sample<\/span><span class=\"o\">(<\/span><span class=\"kt\">int<\/span><span class=\"o\">...<\/span> <span class=\"n\">num<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">for<\/span> <span class=\"o\">(<\/span><span class=\"kt\">int<\/span> <span class=\"n\">i<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"o\">;<\/span> <span class=\"n\">i<\/span> <span class=\"o\">&lt;<\/span> <span class=\"n\">num<\/span><span class=\"o\">.<\/span><span class=\"na\">length<\/span><span class=\"o\">;<\/span> <span class=\"n\">i<\/span><span class=\"o\">++)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">num<\/span><span class=\"o\">[<\/span><span class=\"n\">i<\/span><span class=\"o\">]);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u53ef\u5909\u9577\u5f15\u6570\u306f\u914d\u5217\u3068\u3057\u3066\u6e21\u3055\u308c\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u53ef\u5909\u9577\u5f15\u6570\u306f\u6700\u5f8c\u306b\u3060\u3051\u6307\u5b9a\u53ef\u80fd<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"kt\">void<\/span> <span class=\"nf\">sampl<\/span><span class=\"o\">(<\/span><span class=\"kt\">int<\/span><span class=\"o\">...<\/span> <span class=\"n\">num<\/span><span class=\"o\">,<\/span> <span class=\"kt\">int<\/span> <span class=\"n\">pos<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n  <span class=\"err\">\u2192<\/span><span class=\"n\">\u30a8\u30e9\u30fc<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u306e\u30a2\u30af\u30bb\u30b9\u5f37\u5ea6<\/ul>\n<\/li>\n<\/ul>\n<p>public: \u3059\u3079\u3066\u306e\u30af\u30e9\u30b9\u304b\u3089\u30a2\u30af\u30bb\u30b9\u53ef\u80fd<br \/>\nprotected: \u540c\u3058\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u5c5e\u3059\u308b\u304b\u3001\u7d99\u627f\u3057\u3066\u3044\u308b\u30b5\u30d6\u30af\u30e9\u30b9\u304b\u3089\u306e\u307f\u30a2\u30af\u30bb\u30b9\u53ef\u80fd<br \/>\n\u4fee\u98fe\u5b50\u306a\u3057: \u540c\u3058\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u5c5e\u3059\u308b\u30af\u30e9\u30b9\u304b\u3089\u30a2\u30af\u30bb\u30b9\u53ef\u80fd<br \/>\nprivate: \u30af\u30e9\u30b9\u5185\u304b\u3089\u306e\u307f\u30a2\u30af\u30bb\u30b9\u53ef\u80fd<br \/>\n\u6ce8\u610f: \u7121\u540d\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u5c5e\u3059\u308b\u30af\u30e9\u30b9\u306f\u540c\u3058\u7121\u540d\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u5c5e\u3059\u308b\u30af\u30e9\u30b9\u304b\u3089\u3057\u304b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044<\/p>\n<p>\u7d99\u627f\u3057\u305f\u30e1\u30bd\u30c3\u30c9\u306e\u4fee\u98fe\u5b50\u306f\u5143\u306e\u4fee\u98fe\u5b50\u3068\u540c\u3058\u304b\u3001\u305d\u308c\u3046\u3088\u308a\u3082\u3086\u308b\u3044\u4fee\u98fe\u5b50\u3092\u3064\u3051\u308b<br \/>\n(ex: protected: protected or public)<br \/>\n\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u62bd\u8c61\u30e1\u30bd\u30c3\u30c9\u306f\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50\u306f&#8221;public&#8221;<br \/>\nstatic \u3067\u4fee\u98fe\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u304b\u3089\u306f\u3001static \u3067\u4fee\u98fe\u3055\u308c\u305f\u3082\u306e\u4ee5\u5916\u306b\u306f\u30a2\u30af\u30bb\u30b9\u3067\u304d\u306a\u3044<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kt\">int<\/span> <span class=\"n\">num<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">test<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"n\">num<\/span><span class=\"o\">++;<\/span>\r\n      <span class=\"err\">\u2192<\/span><span class=\"n\">\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">ptintln<\/span><span class=\"o\">(<\/span><span class=\"n\">num<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u6697\u9ed9\u306e\u578b\u5909\u63db\u306b\u3088\u308a\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u300c\u3042\u3044\u307e\u3044\u306a\u30e1\u30bd\u30c3\u30c9\u306e\u547c\u3073\u51fa\u3057\u300d\u304c\u767a\u751f\u3059\u308b<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"nc\">Main<\/span> <span class=\"n\">m<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Main<\/span><span class=\"o\">();<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">m<\/span><span class=\"o\">.<\/span><span class=\"na\">calc<\/span><span class=\"o\">(<\/span><span class=\"mi\">2<\/span><span class=\"o\">,<\/span> <span class=\"mi\">3<\/span><span class=\"o\">));<\/span>\r\n      <span class=\"err\">\u2192<\/span><span class=\"mi\">2<\/span><span class=\"o\">,<\/span> <span class=\"mi\">3<\/span> <span class=\"n\">\u306f\u6697\u9ed9\u306e\u578b\u5909\u63db\u306b\u3088\u308a<\/span><span class=\"err\">\u3001<\/span><span class=\"kt\">double<\/span> <span class=\"n\">\u306b\u3082\u89e3\u91c8\u3067\u304d\u308b\u3053\u306e\u305f\u3081<\/span><span class=\"err\">\u3001<\/span>\r\n        <span class=\"n\">\u30aa\u30fc\u30d0\u30ed\u30fc\u30c9\u3055\u308c\u305f\u3069\u3061\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u304b\u5224\u65ad\u3067\u304d\u306a\u3044<\/span><span class=\"err\">\u3002\u3002\u3002<\/span>\r\n        <span class=\"err\">\u2192\u300c<\/span><span class=\"n\">\u3042\u3044\u307e\u3044\u306a\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057<\/span><span class=\"err\">\u300d<\/span><span class=\"n\">\u306b\u3066\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"kd\">private<\/span> <span class=\"kt\">double<\/span> <span class=\"nf\">calc<\/span><span class=\"o\">(<\/span><span class=\"kt\">double<\/span> <span class=\"n\">a<\/span><span class=\"o\">,<\/span> <span class=\"kt\">int<\/span> <span class=\"n\">b<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"k\">return<\/span> <span class=\"o\">(<\/span><span class=\"n\">a<\/span> <span class=\"o\">+<\/span> <span class=\"n\">b<\/span><span class=\"o\">)<\/span> <span class=\"o\">\/<\/span> <span class=\"mi\">2<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"kd\">private<\/span> <span class=\"n\">duoble<\/span> <span class=\"nf\">calc<\/span><span class=\"o\">(<\/span><span class=\"kt\">int<\/span> <span class=\"n\">ak<\/span> <span class=\"kt\">double<\/span> <span class=\"n\">b<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"k\">return<\/span> <span class=\"o\">(<\/span><span class=\"n\">a<\/span> <span class=\"o\">+<\/span> <span class=\"n\">b<\/span><span class=\"o\">)<\/span> <span class=\"o\">\/<\/span> <span class=\"mi\">2<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc\u306e\u547c\u3073\u51fa\u3057(super, this)\u306f\u51e6\u7406\u306e\u6700\u521d\u306b\u884c\u308f\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nf\">Main<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"A\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"k\">this<\/span><span class=\"o\">(<\/span><span class=\"s\">\"B\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"err\">\u2192<\/span><span class=\"n\">\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9<\/span>\r\n    <span class=\"o\">}<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nf\">Main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">str<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"B\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"nc\">Main<\/span> <span class=\"n\">m<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Main<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">protected \u306f\u3001\u7d99\u627f\u3055\u308c\u305f\u30af\u30e9\u30b9\u5185\u3067\u53c2\u7167\u3067\u304d\u308b\uff08\u304c\u3001\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3068\u3057\u3066\u306f\u547c\u3073\u51fa\u305b\u306a\u3044\uff09<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5f53\u7136\u3067\u3059\u304c\u3001\u52d8\u9055\u3044\u3057\u305d\u3046\u306a\u306e\u3067<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"kn\">package<\/span> <span class=\"nn\">other<\/span><span class=\"o\">;<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Book<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">isbn<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">setIsbn<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">isbn<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">isbn<\/span> <span class=\"o\">=<\/span> <span class=\"n\">isbn<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n    <span class=\"kd\">protected<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">printInfo<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">isbn<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>  <span class=\"kn\">package<\/span> <span class=\"nn\">pkg<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"kn\">import<\/span> <span class=\"nn\">other.Book<\/span><span class=\"o\">;<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">StoryBook<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">Book<\/span> <span class=\"o\">{}<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>  <span class=\"kn\">package<\/span> <span class=\"nn\">pkg<\/span><span class=\"o\">;<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"nc\">StoryBook<\/span> <span class=\"n\">sb<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">StoryBook<\/span><span class=\"o\">();<\/span>\r\n      <span class=\"n\">sb<\/span><span class=\"o\">.<\/span><span class=\"na\">setIsbn<\/span><span class=\"o\">(<\/span><span class=\"s\">\"xxxx-xxxx-xxxx\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"n\">sb<\/span><span class=\"o\">.<\/span><span class=\"na\">printInfo<\/span><span class=\"o\">();<\/span>\r\n      <span class=\"err\">\u2192<\/span><span class=\"n\">\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u7ee7\u627f\u7684\u64cd\u4f5c<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b5\u30d6\u30af\u30e9\u30b9\u306f\u3001\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3001private \u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u3084\u30e1\u30bd\u30c3\u30c9\u306f\u5f15\u304d\u7d99\u304c\u306a\u3044<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u7d99\u627f\u306e\u30eb\u30fc\u30eb<\/ul>\n<\/li>\n<\/ul>\n<p>\u30af\u30e9\u30b9\u540c\u58eb\u306f\u5358\u4e00\u7d99\u627f\u306e\u307f<br \/>\n\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u540c\u58eb\u306f\u591a\u91cd\u7d99\u627f\u304c\u53ef\u80fd<\/p>\n<p>\u30dd\u30ea\u30e2\u30d5\u30a3\u30ba\u30e0\u306f\u3001\u7d99\u627f\u95a2\u4fc2\u306b\u3042\u308b\u30af\u30e9\u30b9\u3060\u3051\u3067\u306a\u304f\u3001\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3068\u5b9f\u88c5\u306e\u95a2\u4fc2\u3067\u3082\u306a\u308a\u305f\u3064<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">interface<\/span> <span class=\"nf\">Worker<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kt\">void<\/span> <span class=\"nf\">work<\/span><span class=\"o\">();<\/span>\r\n  <span class=\"o\">}<\/span>\r\n\r\n  <span class=\"kd\">class<\/span> <span class=\"nc\">Employee<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">work<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"work\"<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n\r\n  <span class=\"kd\">class<\/span> <span class=\"nc\">Engineer<\/span> <span class=\"n\">extend<\/span> <span class=\"nc\">Employee<\/span> <span class=\"kd\">implements<\/span> <span class=\"nc\">Worker<\/span> <span class=\"o\">{<\/span> <span class=\"o\">}<\/span>\r\n\r\n  <span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"nc\">Worker<\/span> <span class=\"n\">w<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">Engineer<\/span><span class=\"o\">();<\/span>\r\n      <span class=\"err\">\u2192<\/span><span class=\"n\">work<\/span> <span class=\"n\">\u304c\u51fa\u529b\u3055\u308c\u308b<\/span><span class=\"err\">\uff08<\/span><span class=\"n\">\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u306f\u767a\u751f\u3057\u306a\u3044<\/span><span class=\"err\">\uff09<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u5f02\u5e38\u5904\u7406<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u4f8b\u5916\u30af\u30e9\u30b9\u306f\u3001\u5927\u304d\u304f\u5206\u3051\u3066 Error\u3068Exception\u3001RuntimeException \u306b\u5206\u304b\u308c\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>Error: \u30d7\u30ed\u30b0\u30e9\u30e0\u304b\u3089\u306f\u56de\u5fa9\u4e0d\u80fd\u306a\u30a8\u30e9\u30fc(OutOfMemoryError, StackOverflowError, NoClassDefFoundError \u7b49)<br \/>\n\u2192\u691c\u67fb\u3057\u3066\u3082\u56de\u5fa9\u4e0d\u80fd<br \/>\n\u691c\u67fb\u4f8b\u5916: Exception \u304a\u3088\u3073\u305d\u306e\u30b5\u30d6\u30af\u30e9\u30b9<br \/>\n\u975e\u691c\u67fb\u4f8b\u5916: \u30d7\u30ed\u30b0\u30e9\u30e0\u30df\u30b9\u306b\u3046\u3088\u308b\u30a8\u30e9\u30fc(RuntimeException \u304a\u3088\u3073\u305d\u306e\u30b5\u30d6\u30af\u30e9\u30b9. NullPoiterException \u7b49)<\/p>\n<p>\u691c\u67fb\u4f8b\u5916\u306f\u4f8b\u5916\u306e\u5bfe\u5fdc\u51e6\u7406\u3092\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044(try-catch \u304b throws\u53e5\u5ba3\u8a00\u3092\u5f37\u8981\u3055\u308c\u308b)<br \/>\nstatic \u30a4\u30cb\u30b7\u30e3\u30e9\u30a4\u30b6\u3092\u51e6\u7406\u3057\u3066\u3044\u308b\u5834\u5408\u306b\u30c8\u30e9\u30d6\u30eb\u304c\u767a\u751f\u3057\u305f\u6642\u306b\u306f\u3001\u901a\u77e5\u76f8\u624b\u304c\u3044\u306a\u3044\u305f\u3081\u3001JVM\u306f ExceptionInitializerError \u3092\u767a\u751f\u3055\u305b\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5f37\u5236\u7d42\u4e86\u3059\u308b<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">static<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">name<\/span><span class=\"o\">.<\/span><span class=\"na\">length<\/span><span class=\"o\">()<\/span> <span class=\"o\">==<\/span> <span class=\"mi\">0<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"err\">\u2192<\/span><span class=\"n\">name<\/span> <span class=\"n\">\u304c\u521d\u671f\u5316\u3055\u308c\u3066\u3044\u306a\u3044\u72b6\u614b\u3067<\/span> <span class=\"n\">length<\/span><span class=\"o\">()<\/span> <span class=\"n\">\u3092\u547c\u3073\u51fa\u3057\u305f\u305f\u3081<\/span><span class=\"err\">\u3001<\/span><span class=\"n\">\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b<\/span>\r\n        <span class=\"n\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"sample\"<\/span>\r\n      <span class=\"o\">}<\/span>\r\n      <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">){<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"hellow \"<\/span> <span class=\"o\">+<\/span> <span class=\"n\">name<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">2\u91cd try-catch-finally \u306b\u3064\u3044\u3066 finally \u7bc0\u306f\u304b\u306a\u3089\u305a\u5b9f\u884c\u3055\u308c\u308b<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nf\">Main<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n          <span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">array<\/span><span class=\"o\">=<\/span> <span class=\"o\">{<\/span><span class=\"s\">\"a\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"b\"<\/span><span class=\"o\">,<\/span> <span class=\"s\">\"c\"<\/span><span class=\"o\">};<\/span>\r\n          <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">array<\/span><span class=\"o\">[<\/span><span class=\"mi\">3<\/span><span class=\"o\">]);<\/span>\r\n        <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">ArrayIndexOuntOfBoundsException<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n          <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"D\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span> <span class=\"k\">finally<\/span> <span class=\"o\">{<\/span>\r\n          <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"E\"<\/span><span class=\"o\">);<\/span>\r\n          <span class=\"err\">\u2192<\/span><span class=\"n\">\u5b9f\u884c\u3055\u308c\u308b<\/span>\r\n        <span class=\"o\">}<\/span>\r\n      <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">ArrayIndexOutOfBoundsException<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"F\"<\/span><span class=\"o\">);<\/span>\r\n      <span class=\"o\">}<\/span> <span class=\"k\">finally<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"G\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"err\">\u2192<\/span><span class=\"n\">\u5b9f\u884c\u3055\u308c\u308b<\/span>\r\n      <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n  <span class=\"err\">\u2192<\/span><span class=\"s\">\"D E G\"<\/span><span class=\"n\">\u304c\u8868\u793a\u3055\u308c\u308b<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nf\">Main<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">test<\/span><span class=\"o\">(<\/span><span class=\"kc\">null<\/span><span class=\"o\">));<\/span>\r\n      <span class=\"err\">\u2192<\/span><span class=\"no\">A<\/span> <span class=\"n\">\u3092\u8868\u793a<\/span>\r\n    <span class=\"o\">}<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">test<\/span><span class=\"o\">(<\/span><span class=\"nc\">Object<\/span> <span class=\"n\">obj<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"k\">try<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">obj<\/span><span class=\"o\">.<\/span><span class=\"na\">toString<\/span><span class=\"o\">());<\/span>\r\n      <span class=\"o\">}<\/span> <span class=\"k\">catch<\/span> <span class=\"o\">(<\/span><span class=\"nc\">NullPointerException<\/span> <span class=\"n\">e<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"s\">\"A\"<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"err\">\u2192<\/span><span class=\"no\">A<\/span> <span class=\"n\">\u304c\u30b9\u30bf\u30c3\u30af\u306b\u7a4d\u307e\u308c\u308b<\/span>\r\n      <span class=\"o\">}<\/span> <span class=\"k\">finally<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"s\">\"B\"<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"err\">\u2192<\/span> <span class=\"k\">return<\/span> <span class=\"n\">\u524d\u306b<\/span> <span class=\"no\">B<\/span> <span class=\"n\">\u3092\u51fa\u529b<\/span>\r\n      <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n  <span class=\"err\">\u2192<\/span><span class=\"s\">\"B A\"<\/span> <span class=\"n\">\u304c\u8868\u793a\u3055\u308c\u308b<\/span>\r\n<\/code><\/pre>\n<h2>Java API \u4e2d\u7684\u5173\u952e\u7c7b\u64cd\u4f5c<\/p>\n<ul class=\"post-ul\">String object \u306e\u751f\u6210\u65b9\u6cd5<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"nc\">String<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">String<\/span><span class=\"o\">(<\/span><span class=\"s\">\"sampl\"<\/span><span class=\"o\">);<\/span>\r\n  <span class=\"nc\">String<\/span> <span class=\"n\">b<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"sample\"<\/span>\r\n  <span class=\"nc\">String<\/span> <span class=\"n\">c<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">String<\/span><span class=\"o\">.<\/span><span class=\"na\">valueOf<\/span><span class=\"o\">(<\/span><span class=\"s\">\"sample\"<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">null \u304c\u4ee3\u5165\u3055\u308c\u305f String \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u9023\u7d50(+)\u3059\u308b\u3068&#8221;null&#8221;\u3068\u5909\u63db\u3055\u308c\u3066\u9023\u7d50\u3055\u308c\u308b<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"nc\">String<\/span> <span class=\"n\">a<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">null<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"n\">a<\/span> <span class=\"o\">+=<\/span> <span class=\"s\">\"null\"<\/span><span class=\"o\">;<\/span>\r\n  <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">a<\/span><span class=\"o\">)<\/span>\r\n  <span class=\"err\">\u2192<\/span><span class=\"s\">\"nullnull\"<\/span><span class=\"n\">\u3068\u8868\u793a\u3055\u308c\u308b<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">StringBulider \u306f\u5185\u90e8\u7684\u306b\u30c7\u30fc\u30bf\u3092 char[] \u3067\u7ba1\u7406\u3057\u3001\u30c7\u30d5\u30a9\u30eb\u30c8\u3067 16\u6587\u5b57\u5206\u306e\u30d0\u30c3\u30d5\u30a1\u3092\u6301\u3064<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"nc\">StringBuilder<\/span> <span class=\"n\">sb<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">StringBuilder<\/span><span class=\"o\">(<\/span><span class=\"s\">\"abcde\"<\/span><span class=\"o\">);<\/span>\r\n  <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">sb<\/span><span class=\"o\">.<\/span><span class=\"na\">capacity<\/span><span class=\"o\">());<\/span>\r\n  <span class=\"err\">\u2192<\/span><span class=\"mi\">21<\/span> <span class=\"n\">\u304c\u51fa\u3088\u304f\u3055\u308c\u308b<\/span><span class=\"o\">(<\/span><span class=\"n\">\u30d0\u30c3\u30d5\u30a116\u6587\u5b57<\/span><span class=\"o\">+<\/span><span class=\"mi\">5<\/span><span class=\"o\">)<\/span>\r\n<\/code><\/pre>\n<p>\u30e9\u30e0\u30c0\u5f0f\u306e\u69cb\u6587\u306b\u95a2\u3057\u3066<\/p>\n<p>\u30e9\u30e0\u30c0\u5f0f\u3067\u4e2d\u30ab\u30c3\u30b3\u3092\u7701\u7565\u3057\u305f\u5834\u5408\u3001\u51e6\u7406\u306f\u4e00\u6587\u3067\u8a18\u8ff0\u3067\u304d\u308b\u3002\u3053\u306e\u6642\u3001return \u306f\u8a18\u8ff0\u3067\u304d\u306a\u3044<br \/>\n\u30e9\u30e0\u30c0\u5f0f\u3067\u4e2d\u30ab\u30c3\u30b3\u3092\u8a18\u8ff0\u3057\u305f\u5834\u5408\u3001return \u306f\u7701\u7565\u3067\u304d\u306a\u3044<\/p>\n<p>Function f = str -&gt; &#8220;hello &#8221; + str;<br \/>\nFunction f = str -&gt; { return &#8220;hello &#8221; + str };<\/p>\n<p>\u30e9\u30e0\u30c0\u306e\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u5ba3\u8a00\u3057\u305f\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u3068\u540c\u3058\u540d\u524d\u306e\u5909\u6570\u3092\u30e9\u30e0\u30c0\u5f0f\u306e\u5909\u6570\u306b\u4f7f\u3046\u3053\u3068\u306f\u3067\u304d\u306a\u3044<\/p>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Main<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"nc\">String<\/span> <span class=\"n\">val<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"A\"<\/span><span class=\"o\">;<\/span>\r\n      <span class=\"nc\">Function<\/span> <span class=\"n\">f<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"n\">val<\/span><span class=\"o\">)<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"o\">{<\/span> <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">val<\/span><span class=\"o\">);<\/span> <span class=\"o\">};<\/span>\r\n      <span class=\"err\">\u2192<\/span><span class=\"n\">\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/span>\r\n    <span class=\"o\">}<\/span>\r\n    <span class=\"kd\">interface<\/span> <span class=\"nc\">Function<\/span> <span class=\"o\">{<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">test<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">val<\/span><span class=\"o\">);<\/span> <span class=\"o\">}<\/span>\r\n    <span class=\"err\">\u2192<\/span><span class=\"n\">\u95a2\u6570\u578b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u30e9\u30e0\u30c0\u5f0f\u306e\u5916\u3067\u5ba3\u8a00\u3055\u308c\u305f\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306b\u30e9\u30e0\u30c0\u5f0f\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3059\u308b\u306b\u306f\u3001\u5b9f\u8cea\u7684\u306b final \u306a\u5909\u6570\u3067\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\uff08\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff09<\/ul>\n<pre class=\"post-pre\"><code>  <span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Sample<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">main<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n      <span class=\"kt\">int<\/span> <span class=\"n\">cnt<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"o\">;<\/span>\r\n      <span class=\"nc\">Runnable<\/span> <span class=\"n\">r<\/span> <span class=\"o\">=<\/span> <span class=\"o\">()<\/span> <span class=\"o\">-&gt;<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">for<\/span> <span class=\"o\">(<\/span><span class=\"n\">cnt<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0<\/span><span class=\"o\">;<\/span>  <span class=\"n\">cnt<\/span> <span class=\"o\">&lt;<\/span> <span class=\"mi\">10<\/span><span class=\"o\">;<\/span> <span class=\"n\">i<\/span><span class=\"o\">++)<\/span> <span class=\"o\">{<\/span>\r\n          <span class=\"err\">\u2192<\/span><span class=\"n\">\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/span><span class=\"o\">(<\/span><span class=\"kd\">final<\/span> <span class=\"n\">\u3067\u306a\u3044<\/span><span class=\"err\">\u3002\u3002\u3002<\/span><span class=\"o\">)<\/span>\r\n          <span class=\"nc\">System<\/span><span class=\"o\">.<\/span><span class=\"na\">out<\/span><span class=\"o\">.<\/span><span class=\"na\">println<\/span><span class=\"o\">(<\/span><span class=\"n\">cnt<\/span><span class=\"o\">++);<\/span>\r\n        <span class=\"o\">}<\/span>\r\n      <span class=\"o\">}<\/span>\r\n      <span class=\"k\">new<\/span> <span class=\"nf\">Thread<\/span><span class=\"o\">(<\/span><span class=\"n\">r<\/span><span class=\"o\">).<\/span><span class=\"na\">start<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span>\r\n  <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">StringBuilder \u306e equals \u30e1\u30bd\u30c3\u30c9\u306f object \u306e\u6bd4\u8f03(\u5024\u6bd4\u8f03\u306f\u884c\u308f\u306a\u3044)<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">LocalDate, LocalDateTime \u30af\u30e9\u30b9\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3067\u3042\u308a\u3048\u306a\u65e5\u4ed8\u3092\u6307\u5b9a\u3059\u308b\u3068\u4f8b\u5916\u304c throw \u3055\u308c\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">LocalData, LocalDateTime \u30af\u30e9\u30b9\u306f immutable(\u5185\u90e8\u30c7\u30fc\u30bf\u306f\u66f4\u65b0\u3055\u308c\u306a\u3044)<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u8003\u8bd5\u6280\u5de7 \u8a2d\u554f\u3092\u3088\u304f\u8aad\u3080\u3053\u3068\uff08\u6b63\u3057\u3044\u3001\u8aa4\u308a\u3092\u30013\u500b\u306a\u3069\u306f\u898b\u843d\u3068\u3055\u306a\u3044\uff09 &nbsp; \u5909\u6570\u306e\u578b\u3001\u30a2\u30af\u30bb\u30b9\u4fee\u98fe\u5b50 [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31029","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Java] Java SE 8 \u94f6\u8272\u7b14\u8bb0 - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e[Java] Java SE 8 \u94f6\u8272\u7b14\u8bb0\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/java-java-se-8-\u94f6\u8272\u7b14\u8bb0\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" 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