{"id":31395,"date":"2023-07-12T16:50:21","date_gmt":"2023-03-24T19:00:10","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b\/"},"modified":"2025-08-12T23:49:31","modified_gmt":"2025-08-12T15:49:31","slug":"java-%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b\/","title":{"rendered":"Java \u6570\u636e\u7c7b\u578b"},"content":{"rendered":"<h1>\u6570\u636e\u7c7b\u578b<\/h1>\n<p>\u6570\u636e\u7c7b\u578b\u662f\u6307\u5b58\u50a8\u5728\u53d8\u91cf\u4e2d\u7684\u6570\u636e\u7684\u5206\u7c7b\u3002<\/p>\n<p>\u6570\u636e\u7c7b\u578b\u5206\u4e3a\u56db\u79cd\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u6574\u6570<\/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\">\u5c0f\u6570<\/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\">\u6587\u5b57<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u30d6\u30fc\u30eb\u578b\uff08\u771f\u507d\u5024\u578b\uff09<\/ul>\n<h1>\u6574\u6570\u7c7b\u578b\u7684\u6570\u636e<\/h1>\n<p>\u6574\u6570\u6570\u636e\u7c7b\u578b\u5305\u62ecbyte\u3001short\u3001int\u548clong\u8fd9\u56db\u79cd\u3002<br \/>\n\u5b83\u4eec\u7684\u6570\u503c\u8303\u56f4\u5404\u4e0d\u76f8\u540c\u3002<\/p>\n<div>\n<div class=\"post-table\">\u578b\u540d\u6271\u3048\u308b\u6574\u6570\u5024\u306e\u7bc4\u56f2byte-256~255short-32768~+32767int-\u7d0420\u5104~+\u7d0420\u5104long\u300c\u4eac\u300d\u306e\u6841\u4ee5\u4e0a<\/div>\n<\/div>\n<p>\u203b \u5982\u679c\u662f long \u7c7b\u578b\u7684\u8bdd\uff0c\u6700\u540e\u9700\u8981\u52a0\u4e0a\u5c0f\u5199\u6216\u5927\u5199\u7684\u5b57\u6bcd &#8220;L&#8221;\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Lesson07_01<\/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\">byte<\/span> <span class=\"n\">var01<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"kt\">short<\/span> <span class=\"n\">var02<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">12345<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"kt\">int<\/span> <span class=\"n\">var03<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1234567890<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"kt\">long<\/span> <span class=\"n\">var04<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">123456789000L<\/span><span class=\"o\">;<\/span>\r\n\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\">var01<\/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\">var02<\/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\">var03<\/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\">var04<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h1>\u5c0f\u6570<\/h1>\n<p>\u5c0f\u6570\u7c7b\u578b\u6709\u4e24\u79cd\uff1afloat\u548cdouble\u3002<br \/>\nfloat\u548cdouble\u5728\u80fd\u5904\u7406\u7684\u5c0f\u6570\u4f4d\u6570\u4e0a\u6709\u6240\u4e0d\u540c\u3002<\/p>\n<p>double\u80fd\u591f\u5904\u7406\u6bd4float\u66f4\u591a\u4f4d\u6570\u7684\u5c0f\u6570\u70b9\u3002<\/p>\n<p>\u5728\u6d6e\u9ede\u6578\uff08float\uff09\u7684\u7d50\u5c3e\u6dfb\u52a0\u5b57\u6bcd\u300cF\u300d\uff0c\u5c31\u50cf\u5728\u9577\u6574\u6578\uff08long\uff09\u7684\u7d50\u5c3e\u4e00\u6a23\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Lesson07_02<\/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\">double<\/span> <span class=\"n\">var01<\/span> <span class=\"o\">=<\/span> <span class=\"mf\">1.23456789<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"kt\">float<\/span> <span class=\"n\">var02<\/span> <span class=\"o\">=<\/span> <span class=\"mf\">1.234<\/span><span class=\"no\">F<\/span><span class=\"o\">;<\/span>\r\n\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\">var01<\/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\">var02<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h1>\u6587\u5b57\u53ef\u4ee5\u88ab\u5927\u81ea\u7136\u7684\u529b\u91cf\u6fc0\u53d1\u521b\u9020\u548c\u8868\u8fbe\u7684\u80fd\u529b\u3002<\/h1>\n<p>\u6587\u5b57\u7c7b\u578b\u7684\u6570\u636e\u7c7b\u578b\u6709\u4e24\u79cd\uff0c\u5206\u522b\u662fchar\u548cString\u3002<br \/>\n\u5f53\u53ea\u6709\u4e00\u4e2a\u5b57\u7b26\u65f6\uff0c\u4f7f\u7528char\uff1b\u5f53\u6709\u4e24\u4e2a\u6216\u66f4\u591a\u5b57\u7b26\u65f6\uff0c\u4f7f\u7528String\u3002<\/p>\n<div>\n<div class=\"post-table\">\u578b\u540d\u6587\u5b57\u3092\u56f2\u3080\u6587\u5b57char\u30b7\u30f3\u30b0\u30eb\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3 (&#8216;)String\u30c0\u30d6\u30eb\u30af\u30a9\u30fc\u30c6\u30fc\u30b7\u30e7\u30f3 (&#8220;)<\/div>\n<\/div>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Lesson07_03<\/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\">char<\/span> <span class=\"n\">var01<\/span> <span class=\"o\">=<\/span> <span class=\"sc\">'c'<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"nc\">String<\/span> <span class=\"n\">var02<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"hellow,World!\"<\/span><span class=\"o\">;<\/span>\r\n\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\">var01<\/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\">var02<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h1>\u5e03\u5c14\u578b<\/h1>\n<p>\u5e03\u5c14\u503c\uff08\u771f\u5047\u503c\uff09\u7684\u6570\u636e\u7c7b\u578b\u662f\u5e03\u5c14\u3002<\/p>\n<div>\n<div class=\"post-table\">\u30d6\u30fc\u30eb\u5024\u610f\u5473true\u771ffalse\u507d<\/div>\n<\/div>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Lesson07_0\uff14<\/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\r\n        <span class=\"kt\">int<\/span> <span class=\"n\">var_a<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">10<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"kt\">int<\/span> <span class=\"n\">var_b<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"kt\">boolean<\/span> <span class=\"n\">var_bool<\/span><span class=\"o\">;<\/span>\r\n\r\n        <span class=\"n\">var_bool<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"n\">var_a<\/span> <span class=\"o\">&gt;<\/span> <span class=\"kt\">var<\/span><span class=\"o\">&gt;<\/span><span class=\"n\">b<\/span><span class=\"o\">);<\/span>\r\n\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\">var_bool<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u6570\u636e\u7c7b\u578b \u6570\u636e\u7c7b\u578b\u662f\u6307\u5b58\u50a8\u5728\u53d8\u91cf\u4e2d\u7684\u6570\u636e\u7684\u5206\u7c7b\u3002 \u6570\u636e\u7c7b\u578b\u5206\u4e3a\u56db\u79cd\u3002 \u6574\u6570 &nbsp; \u5c0f\u6570 &nbsp;  [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31395","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 \u6570\u636e\u7c7b\u578b - Blog - Silicon 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