{"id":935,"date":"2023-02-01T16:13:34","date_gmt":"2022-07-19T07:21:38","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/%e3%82%b3%e3%82%a2java%e3%82%af%e3%82%a4%e3%82%ba\/"},"modified":"2025-08-01T03:39:55","modified_gmt":"2025-07-31T18:39:55","slug":"%e3%82%b3%e3%82%a2java%e3%82%af%e3%82%a4%e3%82%ba","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%82%b3%e3%82%a2java%e3%82%af%e3%82%a4%e3%82%ba\/","title":{"rendered":"\u30b3\u30a2Java\u30af\u30a4\u30ba"},"content":{"rendered":"<p>\u30b3\u30a2Java\u30af\u30a4\u30ba\u3078\u3088\u3046\u3053\u305d\u3002Java\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3059\u3002<\/p>\n<h2>\u30b3\u30a2Java\u30af\u30a4\u30ba<\/h2>\n<p>\u3053\u306e\u30af\u30a4\u30ba\u3067\u306f\u3001Core Java\u306e\u57fa\u790e\u3068OOPS\u306e\u6982\u5ff5\u306b\u3064\u3044\u3066\u30c6\u30b9\u30c8\u3055\u308c\u307e\u3059\u3002\u3044\u304f\u3064\u304b\u306e\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u3082\u3042\u308a\u3001\u57fa\u672c\u7684\u306aJava\u306e\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30b9\u30ad\u30eb\u3092\u30c6\u30b9\u30c8\u3057\u307e\u3059\u3002<\/p>\n<p>\u3044\u304f\u3064\u304b\u306e\u8cea\u554f\u306b\u306f\u8907\u6570\u306e\u7b54\u3048\u304c\u3042\u308a\u307e\u3059\u3002\u6b63\u89e3\u3068\u8aac\u660e\u3092\u898b\u308b\u305f\u3081\u306b\u300c\u7b54\u3048\u3092\u8868\u793a\u3059\u308b\u300d\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u6c17\u306b\u5165\u3063\u305f\u3089\u6311\u6226\u3057\u3066\u4ed6\u306e\u4eba\u3068\u5171\u6709\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h4>\u4ee5\u4e0b\u306e\u3046\u3061\u3001Java\u3067\u914d\u5217\u3092\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5316\u3059\u308b\u305f\u3081\u306b\u6b63\u3057\u3044\u65b9\u6cd5\u306f\u3069\u308c\u3067\u3059\u304b\uff1f<\/h4>\n<p>A. myArray\u306b\u306f1\u30013\u30015\u304c\u5165\u3063\u305f\u6574\u6570\u306e\u914d\u5217\u3092\u5b9a\u7fa9\u3059\u308b\u3002<br \/>\nB. myArray\u306b\u306f1\u304b\u30894\u307e\u3067\u306e\u6574\u6570\u304c\u5165\u3063\u305f2\u6b21\u5143\u306e\u914d\u5217\u3092\u5b9a\u7fa9\u3059\u308b\u3002<br \/>\nC. myArray\u306b\u306f5\u30014\u30013\u304c\u5165\u3063\u305f\u6574\u6570\u306e\u914d\u5217\u3092\u5b9a\u7fa9\u3059\u308b\u3002<br \/>\nD. myArray\u306b\u306f&#8221;1&#8243;\u3001&#8221;2&#8243;\u3001&#8221;3&#8243;\u304c\u5165\u3063\u305f\u6587\u5b57\u5217\u306e\u914d\u5217\u3092\u5b9a\u7fa9\u3059\u308b\u3002<\/p>\n<details>\u300c1\u300d\u3001\u300c2\u300d\u3001\u300c3\u300d\u3092\u542b\u3080int\u578b\u306e\u914d\u5217myArray = {\u201c1\u201d, \u201c2\u201d, \u201c3\u201d};\u306f\u7121\u52b9\u3067\u3059\u3002String\u306fint\u306b\u5909\u63db\u3067\u304d\u306a\u3044\u305f\u3081\u3067\u3059\u3002<br \/>\n(5, 4, 3);\u3092\u542b\u3080int\u578b\u306e\u914d\u5217myArray = (5, 4, 3);\u306f\u7121\u52b9\u3067\u3059\u3002\u914d\u5217\u8981\u7d20\u306f\u6ce2\u62ec\u5f27\uff08{}\uff09\u3067\u5b9a\u7fa9\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u305f\u3081\u3067\u3059\u3002<br \/>\nmyArray [] [] = {1,2,3,4};\u3092\u542b\u3080int\u578b\u306e\u914d\u5217myArray\u306f\u7121\u52b9\u3067\u3059\u3002\u3053\u306e\u5834\u5408\u3001myArray\u306f\u4e8c\u6b21\u5143\u914d\u5217\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u308b\u3079\u304d\u3067\u3059\u304c\u3001\u4e00\u6b21\u5143\u914d\u5217\u3068\u3057\u3066\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u300c\u30bf\u30a4\u30d7\u30df\u30b9\u30de\u30c3\u30c1\uff1aint\u304b\u3089int []\u306b\u5909\u63db\u3067\u304d\u307e\u305b\u3093\u300d\u3068\u30a8\u30e9\u30fc\u3092\u5831\u544a\u3057\u307e\u3059\u3002<\/details>\n<h4>\uff12. \u4ee5\u4e0b\u306e\u4e2d\u3067\u3001Java\u306b\u304a\u3051\u308b\u4e88\u7d04\u8a9e\u306f\u3069\u308c\u3067\u3059\u304b\uff1f<\/h4>\n<p>A. \u914d\u5217 (\u306f\u3044\u308c\u3064)<br \/>\nB. \u30b8\u30e3\u30f3\u30d7 (\u3058\u3083\u3093\u3077)<br \/>\nC. \u30cc\u30eb (\u306c\u308b)<br \/>\nD. \u6574\u6570 (\u305b\u3044\u3059\u3046)<\/p>\n<details>Java\u306b\u304a\u3044\u3066\u3001goto\u3068int\u306f\u4e88\u7d04\u8a9e\u3067\u3059\u3002array\u3068null\u306f\u4e88\u7d04\u8a9e\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/details>\n<h4>3. \u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3057\u3066\u5b9f\u884c\u3057\u305f\u5834\u5408\u3001\u3069\u3046\u306a\u308a\u307e\u3059\u304b\uff1f<\/h4>\n<pre class=\"post-pre\"><code>interface Foo{ int x = 10;}\r\n\r\npublic class Test { \r\n    public static void main(String[] args) { \r\n        Foo.x = 20; \r\n        System.out.println(Foo.x); \r\n    }\r\n}\r\n<\/code><\/pre>\n<p>A. 10\u3092\u51fa\u529b\u3059\u308b\u3002<br \/>\nB. 20\u3092\u51fa\u529b\u3059\u308b\u3002<br \/>\nC. \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc\u3002<br \/>\nD. Foo.x\u304cfinal\u306a\u306e\u3067\u3001\u30e9\u30f3\u30bf\u30a4\u30e0\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u3002<\/p>\n<details>\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u3059\u3079\u3066public\u3001static\u3001\u304a\u3088\u3073final\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u5909\u66f4\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u305a\u3001\u6587Foo.x = 20;\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/details>\n<h4>\u300c\u4e0b\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u4f55\u306b\u306a\u308a\u307e\u3059\u304b\uff1f\u300d<\/h4>\n<pre class=\"post-pre\"><code>public class Test {\r\n\tpublic static void main(String[] args) {\r\n\t\tchar c = 65;\r\n\t\tSystem.out.println(\"c = \" + c);\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>A. \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc<br \/>\nB. \u300cc = A\u300d\u3068\u51fa\u529b\u3059\u308b<br \/>\nC. \u5b9f\u884c\u6642\u30a8\u30e9\u30fc<br \/>\nD. \u300cc = 65\u300d\u3068\u51fa\u529b\u3059\u308b<\/p>\n<details>Java\u30b3\u30f3\u30d1\u30a4\u30e9\u306f\u3001int\u3092char\u306b\u81ea\u52d5\u7684\u306b\u5909\u63db\u3057\u3088\u3046\u3068\u3057\u307e\u3059\u300265\u306fA\u306b\u5909\u63db\u3055\u308c\u308b\u305f\u3081\u3001\u51fa\u529b\u306f\u300cc = A\u300d\u306b\u306a\u308a\u307e\u3059\u3002char\u306e\u5024\u306fu0000\u304b\u3089uffff\u307e\u3067\u306e\u7bc4\u56f2\u3067\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001char c = 65535;\u306f\u6709\u52b9\u3067\u3059\u304c\u3001char c = 65536;\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/details>\n<h4>\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h4>\n<pre class=\"post-pre\"><code>public class Test { \r\n    public void main(String[] args) {\r\n        int x = 10*20-20; \r\n        System.out.println(x); \r\n    }\r\n}\r\n<\/code><\/pre>\n<p>A. \u30e9\u30f3\u30bf\u30a4\u30e0\u30a8\u30e9\u30fc<br \/>\nB. 180\u3092\u51fa\u529b\u3057\u307e\u3059<br \/>\nC. 0\u3092\u51fa\u529b\u3057\u307e\u3059<br \/>\nD. \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc<\/p>\n<details>\u6b63\u3057\u3044\u56de\u7b54\uff1aA<br \/>\n\u30e1\u30a4\u30f3\u30e1\u30bd\u30c3\u30c9\u304c\u9759\u7684\u3067\u306a\u3044\u305f\u3081\u3001\u5b9f\u884c\u6642\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u3001\u300cTest\u30af\u30e9\u30b9\u306e\u30e1\u30a4\u30f3\u30e1\u30bd\u30c3\u30c9\u306f\u9759\u7684\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u30e1\u30a4\u30f3\u30e1\u30bd\u30c3\u30c9\u3092\u6b21\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3057\u3066\u304f\u3060\u3055\u3044\uff1apublic static void main(String[] args)\u300d\u3068\u306a\u308a\u307e\u3059\u3002<\/details>\n<h4>6. Java\u306b\u304a\u3051\u308bstatic\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u6709\u52b9\u306a\u8a18\u8ff0\u306f\u4f55\u3067\u3059\u304b\uff1f<\/h4>\n<p>A. \u30af\u30e9\u30b9\u5185\u306b\u306f\u9759\u7684\u30d6\u30ed\u30c3\u30af\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\nB. \u30af\u30e9\u30b9\u5185\u306e\u9759\u7684\u30d6\u30ed\u30c3\u30af\u306f\u3001\u30af\u30e9\u30b9\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4f5c\u6210\u3055\u308c\u308b\u305f\u3073\u306b\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<br \/>\nC. \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306b\u306f\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\nD. \u30e1\u30bd\u30c3\u30c9\u5185\u306b\u9759\u7684\u30d6\u30ed\u30c3\u30af\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<details>\u30af\u30e9\u30b9\u5185\u306b\u306f\u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u30d6\u30ed\u30c3\u30af\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30af\u30e9\u30b9\u304c\u30ed\u30fc\u30c9\u3055\u308c\u308b\u969b\u306b\u4e00\u5ea6\u3060\u3051\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002Java 8\u4ee5\u964d\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u5185\u3067\u3082\u30b9\u30bf\u30c6\u30a3\u30c3\u30af\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/details>\n<h4>7. \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u4e2d\u6838\u6982\u5ff5\u3092\u3059\u3079\u3066\u9078\u629e\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/h4>\n<p>A. \u62bd\u8c61\u5316 (\u3061\u3085\u3046\u3057\u3087\u3046\u304b)<br \/>\nB. \u7d99\u627f (\u3051\u3044\u3057\u3087\u3046)<br \/>\nC. \u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<br \/>\nD. \u30dd\u30ea\u30e2\u30fc\u30d5\u30a3\u30ba\u30e0<br \/>\nE. \u30b8\u30a7\u30cd\u30ea\u30af\u30b9<\/p>\n<details>OOPS\u306e\u57fa\u672c\u7684\u306a\u6982\u5ff5\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\uff1b1. \u62bd\u8c61\u5316<br \/>\n2. \u30ab\u30d7\u30bb\u30eb\u5316<br \/>\n3. \u591a\u614b\u6027<br \/>\n4. \u7d99\u627f<br \/>\n5. \u7d44\u307f\u5408\u308f\u305b<br \/>\n6. \u95a2\u9023<br \/>\n7. \u96c6\u7d04<\/p>\n<p>\u8a73\u3057\u304f\u306fOOPS\u306e\u6982\u5ff5\u3092\u3054\u89a7\u304f\u3060\u3055\u3044\u3002<\/p>\n<\/details>\n<h4>8. \u30b8\u30e3\u30d0\u306b\u304a\u3051\u308b\u7d99\u627f\u306b\u95a2\u3057\u3066\u4ee5\u4e0b\u306e\u8a18\u8ff0\u306e\u3046\u3061\u3001\u771f\u5b9f\u306a\u3082\u306e\u306f\u3069\u308c\u3067\u3059\u304b\uff1f<\/h4>\n<p>A. \u300cextend\u300d\u3068\u3044\u3046\u30ad\u30fc\u30ef\u30fc\u30c9\u306f\u3001Java\u3067\u30af\u30e9\u30b9\u3092\u62e1\u5f35\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<br \/>\nB. Java\u3067\u306f\u3001\u8907\u6570\u306e\u30af\u30e9\u30b9\u3092\u62e1\u5f35\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\nC. \u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30e1\u30f3\u30d0\u30fc\u306f\u3001\u30b5\u30d6\u30af\u30e9\u30b9\u304b\u3089\u30a2\u30af\u30bb\u30b9\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\nD. Java\u3067\u306f\u3001Final\u30af\u30e9\u30b9\u3092\u62e1\u5f35\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<details>\u30af\u30ea\u30c3\u30af\u3057\u3066\u56de\u7b54\u3092\u8868\u793a\u3059\u308b<br \/>\n\u6b63\u89e3\uff1aD<br \/>\nJava\u306b\u304a\u3051\u308b\u7d99\u627f\u306f\u3001\u57fa\u672c\u7684\u306a\u6982\u5ff5\u306e\u4e00\u3064\u3067\u3059\u3002\u305d\u308c\u306b\u3064\u3044\u3066\u3088\u304f\u77e5\u3063\u3066\u304a\u304f\u3079\u304d\u3067\u3059\u3002\u56de\u7b54\u306e\u9078\u629e\u80a2\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u5b66\u3076\u305f\u3081\u306b\u3001\u4ee5\u4e0b\u306e\u8a18\u4e8b\u3092\u304a\u8aad\u307f\u304f\u3060\u3055\u3044 &#8211; Java\u306b\u304a\u3051\u308b\u7d99\u627f\u3001Java\u306b\u304a\u3051\u308b\u591a\u91cd\u7d99\u627f\u3002<\/details>\n<h4>9. \u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u4f55\u306b\u306a\u308a\u307e\u3059\u304b\uff1f<\/h4>\n<pre class=\"post-pre\"><code>package com.scdev.java;\r\n\r\npublic class Test {\r\n\tpublic static void main(String[] args) {\r\n\t\tSuper s = new Subclass();\r\n\t\ts.foo();\r\n\t}\r\n}\r\n\r\nclass Super {\r\n\tvoid foo() {\r\n\t\tSystem.out.println(\"Super\");\r\n\t}\r\n}\r\n\r\nclass Subclass extends Super {\r\n\tstatic void foo() {\r\n\t\tSystem.out.println(\"Subclass\");\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>A. \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc (Konpairuji jikan er\u0101)<br \/>\nB. \u30b9\u30fc\u30d1\u30fc (S\u016bp\u0101)<br \/>\nC. \u30b5\u30d6\u30af\u30e9\u30b9 (Sabu kurasu)<br \/>\nD. \u30e9\u30f3\u30bf\u30a4\u30e0\u30a8\u30e9\u30fc (Rantaimu er\u0101)<\/p>\n<details>foo()\u30e1\u30bd\u30c3\u30c9\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306f\u9759\u7684\u3067\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u9759\u7684\u306a\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3092\u96a0\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u305b\u3093\u3002<\/details>\n<h4>10. \u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u4f55\u306b\u306a\u308a\u307e\u3059\u304b\uff1f<\/h4>\n<pre class=\"post-pre\"><code>package com.scdev.java;\r\n\r\npublic class Test {\r\n\tpublic static void main(String[] args) {\r\n\t\tSubclass s1 = new Subclass();\r\n\t\ts1.foo(); \/\/ line 6\r\n\t\tSuper s = new Subclass();\r\n\t\ts.foo(); \/\/ line 8\r\n\t}\r\n}\r\n\r\nclass Super {\r\n\tprivate void foo() {\r\n\t\tSystem.out.println(\"Super\");\r\n\t}\r\n}\r\n\r\nclass Subclass extends Super {\r\n\tpublic void foo() {\r\n\t\tSystem.out.println(\"Subclass\");\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>A. 6\u884c\u76ee\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<br \/>\nB. 8\u884c\u76ee\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<br \/>\nC. 6\u884c\u76ee\u30688\u884c\u76ee\u306e\u4e21\u65b9\u3067\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<br \/>\nD. \u6b63\u5e38\u306b\u52d5\u4f5c\u3057\u3001\u300c\u30b5\u30d6\u30af\u30e9\u30b9\u300d\u30682\u56de\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<details>**\u6b63\u7b54: B**8\u884c\u76ee\u3067\u306e\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc\u3002\u30b9\u30fc\u30d1\u30fc\u30af\u30e9\u30b9\u306efoo()\u30e1\u30bd\u30c3\u30c9\u306fprivate\u306a\u306e\u3067\u3001\u898b\u3048\u306a\u3044\u3068\u3044\u3046\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n<\/details>\n<h4>11. \u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u4f55\u306b\u306a\u308a\u307e\u3059\u304b\uff1f<\/h4>\n<pre class=\"post-pre\"><code>import java.io.IOException;\r\n\r\npublic class Test {\r\n\tpublic static void main(String[] args) {\r\n\t\ttry {\r\n\t\t\tthrow new IOException(\"Hello\");\r\n\t\t} catch (IOException | Exception e) {\r\n\t\t\tSystem.out.println(e.getMessage());\r\n\t\t}\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>A. \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc<br \/>\nB. \u300c\u3053\u3093\u306b\u3061\u306f\u300d\u3068\u8868\u793a\u3059\u308b<br \/>\nC. \u30e9\u30f3\u30bf\u30a4\u30e0\u30a8\u30e9\u30fc<\/p>\n<details>\u30af\u30ea\u30c3\u30af\u3057\u3066\u56de\u7b54\u3092\u8868\u793a\u3059\u308b<br \/>\n\u6b63\u3057\u3044\u7b54\u3048: A<br \/>\n\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f\u3002IOException\u4f8b\u5916\u306f\u3059\u3067\u306b\u4ee3\u66ff\u306eException\u306b\u3088\u3063\u3066\u30ad\u30e3\u30c3\u30c1\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/details>\n<h4>12. \u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u4f55\u306b\u306a\u308a\u307e\u3059\u304b\uff1f<\/h4>\n<pre class=\"post-pre\"><code>public class Test {\r\n\tpublic static void main(String[] args) {\r\n\t\tString x = \"abc\";\r\n\t\tString y = \"abc\";\r\n\t\tx.concat(y);\r\n\t\tSystem.out.print(x);\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>A. abcabc -&gt; \u30a2\u30fc\u30d3\u30fc\u30b7\u30fc\u30a2\u30fc\u30d3\u30fc\u30b7\u30fc<br \/>\nB. abc -&gt; \u30a2\u30fc\u30d3\u30fc\u30b7\u30fc<br \/>\nC. null -&gt; \u30cc\u30eb<\/p>\n<details>x.concat(y); \u306f\u65b0\u3057\u3044\u6587\u5b57\u5217\u3092\u4f5c\u6210\u3057\u307e\u3059\u304c\u3001x \u306b\u306f\u4ee3\u5165\u3055\u308c\u3066\u3044\u306a\u3044\u305f\u3081\u3001x \u306e\u5024\u306f\u5909\u66f4\u3055\u308c\u307e\u305b\u3093\u3002<\/details>\n<h4>13. \u4ee5\u4e0b\u306e\u3046\u3061\u3001Java\u3067\u672a\u30c1\u30a7\u30c3\u30af\u306e\u4f8b\u5916\u306f\u3069\u308c\u3067\u3059\u304b\uff1f<\/h4>\n<p>A. RuntimeException: \u30e9\u30f3\u30bf\u30a4\u30e0\u4f8b\u5916<br \/>\nB. ClassCastException: \u30af\u30e9\u30b9\u30ad\u30e3\u30b9\u30c8\u4f8b\u5916<br \/>\nC. NullPointerException: \u30cc\u30eb\u30dd\u30a4\u30f3\u30bf\u4f8b\u5916<br \/>\nD. IOException: \u5165\u51fa\u529b\u4f8b\u5916<\/p>\n<details>A\u3001B\u3001C \u6b63\u89e3\u3067\u3059<br \/>\nRuntimeException \u30af\u30e9\u30b9\u3068\u305d\u306e\u30b5\u30d6\u30af\u30e9\u30b9\u306f\u30c1\u30a7\u30c3\u30af\u3055\u308c\u3066\u3044\u306a\u3044\u4f8b\u5916\u3067\u3059\u3002\u30c1\u30a7\u30c3\u30af\u3055\u308c\u3066\u3044\u306a\u3044\u4f8b\u5916\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u3084\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u306e throws \u53e5\u3067\u5ba3\u8a00\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/details>\n<h4>14. \u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u4f55\u306b\u306a\u308a\u307e\u3059\u304b\uff1f<\/h4>\n<pre class=\"post-pre\"><code>package com.scdev.java;\r\n\r\nimport java.io.IOException;\r\n\r\npublic class Test {\r\n\tpublic static void main(String[] args) {\r\n\t\ttry {\r\n\t\t\tthrow new Exception(\"Hello \");\r\n\t\t} catch (Exception e) {\r\n\t\t\tSystem.out.print(e.getMessage());\r\n\t\t} catch (IOException e) {\r\n\t\t\tSystem.out.print(e.getMessage());\r\n\t\t} finally {\r\n\t\t\tSystem.out.println(\"World\");\r\n\t\t}\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>A. \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc (Konpairu-ji er\u0101)<br \/>\nB. \u3053\u3093\u306b\u3061\u306f (Konnichiwa)<br \/>\nC. \u3053\u3093\u306b\u3061\u306f\u4e16\u754c (Konnichiwa sekai)<br \/>\nD. \u3053\u3093\u306b\u3061\u306f \u3053\u3093\u306b\u3061\u306f\u4e16\u754c (Konnichiwa konnichiwa sekai)<\/p>\n<details>\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc IOException\u306e\u5230\u9054\u3067\u304d\u306a\u3044catch\u30d6\u30ed\u30c3\u30af\u3067\u3059\u3002Exception\u306ecatch\u30d6\u30ed\u30c3\u30af\u3067\u65e2\u306b\u51e6\u7406\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/details>\n<h4>15. Java\u306b\u3064\u3044\u3066\u4ee5\u4e0b\u306e\u6587\u4e2d\u306e\u3069\u308c\u304c\u771f\u5b9f\u3067\u3059\u304b\uff1f<\/h4>\n<p>A. JVM\u306f\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u3092\u30de\u30b7\u30f3\u56fa\u6709\u306e\u30b3\u30fc\u30c9\u306b\u5909\u63db\u3059\u308b\u8cac\u4efb\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<br \/>\nB. Java\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u3059\u308b\u306b\u306f\u3001JRE\u304c\u5fc5\u8981\u3067\u3059\u3002<br \/>\nC. Java\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u30b3\u30f3\u30d1\u30a4\u30eb\u3059\u308b\u306b\u306fJDK\u304c\u5fc5\u8981\u3067\u3059\u3002<br \/>\nD. JRE\u306b\u306fJVM\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n<details>\u4ee5\u4e0b\u306e\u65e5\u672c\u8a9e\u306b\u30cd\u30a4\u30c6\u30a3\u30d6\u30ec\u30d9\u30eb\u3067\u8a00\u3044\u63db\u3048\u308b\u3068\u3001\u6b21\u306e\u901a\u308a\u3067\u3059\u3002\u30aa\u30d7\u30b7\u30e7\u30f3\u306f 1 \u3064\u3060\u3051\u5fc5\u8981\u3067\u3059\uff1a\u7b54\u3048\u3092\u660e\u3089\u304b\u306b\u3059\u308b\u306b\u306f\u30af\u30ea\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n\u6b63\u3057\u3044\u7b54\u3048: A\u3001B\u3001C<br \/>\n\u8a73\u3057\u3044\u8aac\u660e\u306b\u3064\u3044\u3066\u306f\u3001JDK\u3001JRE\u3001\u304a\u3088\u3073JVM\u3092\u8aad\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/p>\n<\/details>\n<h4>16. java\u306e\u30af\u30e9\u30b9\u5185\u306b\u306f2\u3064\u306e\u30e1\u30a4\u30f3\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u304b\uff1f<\/h4>\n<p>A. \u306f\u3044<br \/>\nB. \u3044\u3044\u3048<\/p>\n<details>\u300c\u6b63\u89e3\u3092\u8868\u793a\u3059\u308b\u300d\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u304f\u3060\u3055\u3044\u3002<br \/>\n\u6b63\u89e3\uff1aA<br \/>\n\u3053\u308c\u306f\u96e3\u3057\u3044\u554f\u984c\u3067\u3057\u305f\u3002Java\u3067\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u30aa\u30fc\u30d0\u30fc\u30ed\u30fc\u30c9\u3092\u901a\u3058\u3066\u300cmain\u300d\u3068\u3044\u3046\u540d\u524d\u306e\u8907\u6570\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/details>\n<h4>17. Java\u306b\u304a\u3051\u308b\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306b\u95a2\u3059\u308b\u4ee5\u4e0b\u306e\u8a18\u8ff0\u306e\u3046\u3061\u3001\u6b63\u3057\u3044\u3082\u306e\u306f\u3069\u308c\u3067\u3059\u304b\uff1f<\/h4>\n<p>A. \u30ab\u30b9\u30bf\u30e0\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306b\u3001@interface\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<br \/>\nB. @Override\u306fJava\u306e\u7d44\u307f\u8fbc\u307f\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u3059\u3002<br \/>\nC. \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u30af\u30e9\u30b9\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u306f\u9069\u7528\u3067\u304d\u307e\u305b\u3093\u3002<br \/>\nD. @Retention\u306fJava\u306e\u30e1\u30bf\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u4e00\u3064\u3067\u3059\u3002<br \/>\nE. \u30af\u30e9\u30b9\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u308b\u3068\u3001Java\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u60c5\u5831\u306f\u5931\u308f\u308c\u307e\u3059\u3002<\/p>\n<details>\u89e3\u7b54\u3092\u8868\u793a\u3059\u308b\u306b\u306f\u3001Java\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u8aad\u3093\u3067\u304f\u3060\u3055\u3044\u3002<\/details>\n<h4>\uff11\uff18\uff0eJava\u306b\u304a\u3051\u308bEnum\u306b\u95a2\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u8a18\u8ff0\u306e\u3046\u3061\u771f\u5b9f\u306a\u3082\u306e\u306f\u3069\u308c\u3067\u3059\u304b\uff1f<\/h4>\n<p>A. \u5168\u3066\u306eJava\u306eenum\u306f\u6697\u9ed9\u7684\u306bjava.lang.Enum\u30af\u30e9\u30b9\u3092\u62e1\u5f35\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\nB. Java\u306eenum\u306f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\nC. new\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u3066enum\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\nD. switch\u6587\u3067\u306fenum\u306f\u4f7f\u7528\u3067\u304d\u307e\u305b\u3093\u3002<br \/>\nE. enum\u306e\u5b9a\u6570\u306f\u6697\u9ed9\u7684\u306bstatic\u3067final\u3067\u3059\u3002<\/p>\n<details>Java\u306b\u304a\u3051\u308b\u5217\u6319\u578b\u306b\u3064\u3044\u3066\u306f\u3001Java\u3067Enum\u3092\u4f7f\u7528\u3059\u308b\u969b\u306bEnum in Java \u306e\u8a18\u4e8b\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/details>\n<h4>19. Java\u306b\u304a\u3044\u3066\u3001\u4ee5\u4e0b\u306e\u4e2d\u3067\u7d44\u307f\u8fbc\u307f\u306e\u30af\u30e9\u30b9\u30ed\u30fc\u30c0\u30fc\u306f\u3069\u308c\u3067\u3059\u304b\uff1f<\/h4>\n<p>A. \u30d6\u30fc\u30c8\u30b9\u30c8\u30e9\u30c3\u30d7\u30af\u30e9\u30b9\u30ed\u30fc\u30c0\u30fc<br \/>\nB. \u62e1\u5f35\u30af\u30e9\u30b9\u30ed\u30fc\u30c0\u30fc<br \/>\nC. \u30e9\u30f3\u30bf\u30a4\u30e0\u30af\u30e9\u30b9\u30ed\u30fc\u30c0\u30fc<br \/>\nD. \u30b7\u30b9\u30c6\u30e0\u30af\u30e9\u30b9\u30ed\u30fc\u30c0\u30fc<\/p>\n<details>\u30af\u30ea\u30c3\u30af\u3057\u3066\u7b54\u3048\u3092\u8868\u793a\u3059\u308b<br \/>\n\u6b63\u89e3: A\u3001B\u3001D<br \/>\n\u300cJava\u306b\u304a\u3051\u308b\u30af\u30e9\u30b9\u30ed\u30fc\u30c0\u30fc\u306b\u3064\u3044\u3066\u306fClassloaders in Java\u3092\u53c2\u7167\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u300d<\/details>\n<h4>\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u4f55\u306b\u306a\u308a\u307e\u3059\u304b\uff1f<\/h4>\n<pre class=\"post-pre\"><code>package com.scdev.util;\r\n\r\npublic class Test {\r\n\tpublic static String toString() {\r\n\t\tSystem.out.println(\"Test toString called\");\r\n\t\treturn \"\";\r\n\t}\r\n\r\n\tpublic static void main(String args[]) {\r\n\t\tSystem.out.println(toString());\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>A. &#8220;\u30c6\u30b9\u30c8toString\u304c\u547c\u3073\u51fa\u3055\u308c\u307e\u3057\u305f&#8221;<br \/>\nB. \u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u30a8\u30e9\u30fc<br \/>\nC. &#8220;Test@7fh2bd8&#8221; (Object\u30af\u30e9\u30b9\u306etoString()\u30e1\u30bd\u30c3\u30c9\u304c\u547c\u3073\u51fa\u3055\u308c\u3066\u3044\u307e\u3059)<\/p>\n<details>\u9078\u629e\u80a2B\uff1a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30af\u30e9\u30b9\u306e\u30e1\u30bd\u30c3\u30c9\u3092static\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u4f7f\u3063\u3066\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30af\u30e9\u30b9\u306b\u306ftoString()\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002\u300c\u3053\u306e\u9759\u7684\u30e1\u30bd\u30c3\u30c9\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u30e1\u30bd\u30c3\u30c9\u3092\u96a0\u3059\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u300d\u3068\u3044\u3046\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/details>\n<h4>\u4ee5\u4e0b\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u306f\u4f55\u306b\u306a\u308a\u307e\u3059\u304b\uff1f<\/h4>\n<pre class=\"post-pre\"><code>public class Test {\r\n\tpublic static void main(String[] args) {\r\n\t\tString s1 = \"abc\";\r\n\t\tString s2 = \"abc\";\r\n\t\tSystem.out.println(\"s1 == s2 is:\" + s1 == s2);\r\n\t}\r\n}\r\n<\/code><\/pre>\n<p>A. s1\u3068s2\u304c\u7b49\u3057\u3044:true<br \/>\nB. false<br \/>\nC. s1\u3068s2\u304c\u7b49\u3057\u3044:false<br \/>\nD. true<\/p>\n<details>\u4e0e\u3048\u3089\u308c\u305f\u6587\u306e\u51fa\u529b\u306f\u300cfalse\u300d\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u3002\u306a\u305c\u306a\u3089\u3001Java\u3067\u306f+\u6f14\u7b97\u5b50\u306e\u512a\u5148\u9806\u4f4d\u304c==\u6f14\u7b97\u5b50\u3088\u308a\u3082\u9ad8\u3044\u304b\u3089\u3067\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u4e0e\u3048\u3089\u308c\u305f\u5f0f\u306f\u300cs1 == s2 is:abc\u300d\u3068\u300cabc\u300d\u3092\u8a55\u4fa1\u3059\u308b\u3053\u3068\u306b\u306a\u308a\u3001\u7d50\u679c\u306ffalse\u3068\u306a\u308a\u307e\u3059\u3002<\/details>\n<h2>\u7d50\u8ad6<\/h2>\n<p>\u30b3\u30a2Java\u30af\u30a4\u30ba\u304c\u304a\u6c17\u306b\u5165\u308a\u3067\u3057\u305f\u3089\u5b09\u3057\u3044\u3067\u3059\u3002\u3082\u3057\u79c1\u304c\u91cd\u8981\u306a\u5206\u91ce\u3092\u898b\u843d\u3068\u3057\u3066\u3044\u308b\u3068\u601d\u3063\u305f\u3089\u3001\u6559\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u3046\u3059\u308c\u3070\u3001\u3082\u3063\u3068\u96e3\u3057\u3044\u30af\u30a4\u30ba\u306e\u554f\u984c\u3092\u8ffd\u52a0\u3057\u307e\u3059\u3002<\/p>\n<p>\u6b21\u306e\u30af\u30a4\u30ba\uff1aJava\u306e\u6587\u5b57\u5217\u30af\u30a4\u30ba<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u30b3\u30a2Java\u30af\u30a4\u30ba\u3078\u3088\u3046\u3053\u305d\u3002Java\u306f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3067\u3059\u3002 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