{"id":50749,"date":"2023-12-23T10:31:41","date_gmt":"2023-12-23T02:31:41","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java%e6%a0%b8%e5%bf%83%e8%80%83%e8%af%95\/"},"modified":"2023-12-23T15:18:45","modified_gmt":"2023-12-23T07:18:45","slug":"java%e6%a0%b8%e5%bf%83%e8%80%83%e8%af%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java%e6%a0%b8%e5%bf%83%e8%80%83%e8%af%95\/","title":{"rendered":"Java\u6838\u5fc3\u8003\u8bd5"},"content":{"rendered":"<p>\u6b22\u8fce\u53c2\u52a0Java\u6838\u5fc3\u77e5\u8bc6\u6d4b\u9a8c\u3002Java\u662f\u4e00\u79cd\u9762\u5411\u5bf9\u8c61\u7684\u7f16\u7a0b\u8bed\u8a00\u3002<\/p>\n<h2>Java \u6838\u5fc3\u77e5\u8bc6\u6d4b\u9a8c<\/h2>\n<p>\u5728\u8fd9\u4e2a\u6d4b\u9a8c\u4e2d\uff0c\u4f60\u5c06\u5728\u6838\u5fc3Java\u57fa\u7840\u548c\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u6982\u5ff5\u4e0a\u63a5\u53d7\u8003\u9a8c\u3002\u8fd8\u6709\u4e00\u4e9b\u4ee3\u7801\u7247\u6bb5\u7528\u6765\u6d4b\u8bd5\u4f60\u7684\u57fa\u672cJava\u7f16\u7801\u80fd\u529b\u3002<\/p>\n<p>\u6709\u4e9b\u95ee\u9898\u6709\u591a\u4e2a\u7b54\u6848\u3002 \u60a8\u53ef\u4ee5\u70b9\u51fb\u201c\u663e\u793a\u7b54\u6848\u201d\u6309\u94ae\u67e5\u770b\u6b63\u786e\u7b54\u6848\u548c\u89e3\u91ca\u3002<\/p>\n<p>\u5982\u679c\u4f60\u559c\u6b22\u7684\u8bdd\uff0c\u8bd5\u4e00\u8bd5\u5e76\u4e0e\u4ed6\u4eba\u5206\u4eab\u3002<\/p>\n<h4>\u4ee5\u4e0b\u54ea\u4e2a\u9009\u9879\u662f\u5728Java\u4e2d\u5b9e\u4f8b\u5316\u6570\u7ec4\u7684\u6709\u6548\u65b9\u6cd5\uff1f<\/h4>\n<p>A. myArray\u7684\u7c7b\u578b\u662fint\u6570\u7ec4\uff0c\u5305\u542b\u7684\u5143\u7d20\u4f9d\u6b21\u4e3a1\u30013\u30015\u3002<br \/>\nB. myArray\u7684\u7c7b\u578b\u662fint\u4e8c\u7ef4\u6570\u7ec4\uff0c\u5305\u542b\u7684\u5143\u7d20\u4f9d\u6b21\u4e3a1\u30012\u30013\u30014\u3002<br \/>\nC. myArray\u7684\u7c7b\u578b\u662fint\u6570\u7ec4\uff0c\u5305\u542b\u7684\u5143\u7d20\u4f9d\u6b21\u4e3a5\u30014\u30013\u3002<br \/>\nD. myArray\u7684\u7c7b\u578b\u662fint\u6570\u7ec4\uff0c\u5305\u542b\u7684\u5143\u7d20\u4f9d\u6b21\u4e3a&#8221;1&#8243;\u3001&#8221;2&#8243;\u3001&#8221;3&#8243;\u3002<\/p>\n<details>\u70b9\u51fb\u5c55\u793a\u7b54\u6848<br \/>\n\u6b63\u786e\u7b54\u6848\uff1aA<br \/>\nint [] myArray = {\u201c1\u201d, \u201c2\u201d, \u201c3\u201d}; \u662f\u65e0\u6548\u7684\uff0c\u56e0\u4e3a\u5b57\u7b26\u4e32\u65e0\u6cd5\u8f6c\u6362\u4e3a\u6574\u6570\u3002<br \/>\nint [] myArray = (5, 4, 3); \u662f\u65e0\u6548\u7684\uff0c\u56e0\u4e3a\u6570\u7ec4\u5143\u7d20\u5e94\u8be5\u5728\u82b1\u62ec\u53f7{}\u4e2d\u5b9a\u4e49\u3002<br \/>\nint myArray [] [] = {1,2,3,4}; \u662f\u65e0\u6548\u7684\uff0c\u56e0\u4e3amyArray\u662f\u4e00\u4e2a\u4e8c\u7ef4\u6570\u7ec4\uff0c\u800c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u88ab\u5b9a\u4e49\u4e3a\u4e00\u4e2a\u4e00\u7ef4\u6570\u7ec4\u3002\u7f16\u8bd1\u5668\u4f1a\u62a5\u9519\uff0c\u9519\u8bef\u7c7b\u578b\u4e3a\uff1a\u7c7b\u578b\u4e0d\u5339\u914d\uff0c\u65e0\u6cd5\u4eceint\u8f6c\u6362\u4e3aint[]\u3002<\/details>\n<h4>\u4ee5\u4e0b\u54ea\u4e2a\u662fJava\u4e2d\u7684\u4fdd\u7559\u5173\u952e\u5b57\uff1f<\/h4>\n<p>A. \u6570\u7ec4<br \/>\nB. \u8df3\u8f6c<br \/>\nC. \u7a7a\u503c<br \/>\nD. \u6574\u6570<\/p>\n<details>\u70b9\u51fb\u67e5\u770b\u7b54\u6848<br \/>\n**\u6b63\u786e\u7b54\u6848\uff1aB\uff0cD<br \/>\n**<br \/>\n\u5728Java\u4e2d\uff0cgoto\u548cint\u662f\u4fdd\u7559\u5173\u952e\u5b57\uff0c\u800carray\u548cnull\u5219\u4e0d\u662f\u5173\u952e\u5b57\u3002<\/details>\n<h4>\u5982\u679c\u6211\u4eec\u8bd5\u56fe\u7f16\u8bd1\u548c\u8fd0\u884c\u4ee5\u4e0b\u7a0b\u5e8f\uff0c\u4f1a\u53d1\u751f\u4ec0\u4e48\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. \u6253\u5370\u51fa10<br \/>\nB. \u6253\u5370\u51fa20<br \/>\nC. \u7f16\u8bd1\u65f6\u9519\u8bef<br \/>\nD. \u8fd0\u884c\u65f6\u9519\u8bef\uff0c\u56e0\u4e3aFoo.x\u662ffinal\u53d8\u91cf\u3002<\/p>\n<details>\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u63a5\u53e3\u7684\u4efb\u4f55\u5b57\u6bb5\u90fd\u662f\u516c\u5171\u7684\u3001\u9759\u6001\u7684\u548c\u4e0d\u53ef\u53d8\u7684\u3002\u56e0\u6b64\u6211\u4eec\u65e0\u6cd5\u6539\u53d8\u5b83\uff0c\u56e0\u6b64\u5728\u8bed\u53e5Foo.x = 20;\u4e2d\u4f1a\u51fa\u73b0\u7f16\u8bd1\u65f6\u9519\u8bef\u3002<\/details>\n<h4>\u4ee5\u4e0b\u7a0b\u5e8f\u7684\u8f93\u51fa\u5c06\u662f\u4ec0\u4e48\uff1f<\/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. \u7f16\u8bd1\u65f6\u9519\u8bef<br \/>\nB. \u8f93\u51fa\u201cc = A\u201d<br \/>\nC. \u8fd0\u884c\u65f6\u9519\u8bef<br \/>\nD. \u8f93\u51fa\u201cc = 65\u201d<\/p>\n<details>\u70b9\u51fb\u663e\u793a\u7b54\u6848<br \/>\n**\u6b63\u786e\u7b54\u6848\uff1aB**<\/p>\n<p>Java \u7f16\u8bd1\u5668\u5c1d\u8bd5\u81ea\u52a8\u5c06 int \u8f6c\u6362\u4e3a char\u3002\u7531\u4e8e 65 \u88ab\u8f6c\u6362\u4e3a A\uff0c\u56e0\u6b64\u8f93\u51fa\u5c06\u662f\u201cc = A\u201d\u3002char \u503c\u7684\u8303\u56f4\u662f\u4ece u0000 \u5230 uffff\u3002\u6240\u4ee5 char c = 65535; \u662f\u6709\u6548\u7684\uff0c\u4f46 char c = 65536; \u5c06\u5bfc\u81f4\u7f16\u8bd1\u65f6\u9519\u8bef\u3002<\/details>\n<h4>\u4ee5\u4e0b\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\u5c06\u4f1a\u662f\u4ec0\u4e48\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. \u8fd0\u884c\u65f6\u9519\u8bef<br \/>\nB. \u6253\u5370\u51fa180<br \/>\nC. \u6253\u5370\u51fa0<br \/>\nD. \u7f16\u8bd1\u65f6\u9519\u8bef<\/p>\n<details>\u5355\u51fb\u67e5\u770b\u7b54\u6848<br \/>\n\u6b63\u786e\u7b54\u6848\uff1aA<br \/>\n\u7531\u4e8e main \u65b9\u6cd5\u4e0d\u662f\u9759\u6001\u7684\uff0c\u6240\u4ee5\u4f1a\u51fa\u73b0\u8fd0\u884c\u65f6\u9519\u8bef\u3002\u9519\u8bef\u6d88\u606f\u5c06\u4f1a\u662f\u5728 Test \u7c7b\u4e2d main \u65b9\u6cd5\u4e0d\u662f\u9759\u6001\u7684\uff0c\u8bf7\u5c06 main \u65b9\u6cd5\u5b9a\u4e49\u4e3a\uff1apublic static void main(String[] args)<\/details>\n<h4>\u5728Java\u4e2d\uff0c\u9759\u6001\u5173\u952e\u5b57\u7684\u6709\u6548\u8bed\u53e5\u6709\u54ea\u4e9b\uff1f<\/h4>\n<p>A. \u4e00\u4e2a\u7c7b\u4e2d\u53ef\u4ee5\u6709\u9759\u6001\u5757\u3002<br \/>\nB. \u7c7b\u4e2d\u7684\u9759\u6001\u5757\u5728\u6bcf\u6b21\u521b\u5efa\u7c7b\u7684\u5bf9\u8c61\u65f6\u90fd\u4f1a\u88ab\u6267\u884c\u3002<br \/>\nC. \u63a5\u53e3\u4e2d\u53ef\u4ee5\u6709\u9759\u6001\u65b9\u6cd5\u7684\u5b9e\u73b0\u3002<br \/>\nD. \u6211\u4eec\u53ef\u4ee5\u5728\u65b9\u6cd5\u5185\u5b9a\u4e49\u9759\u6001\u5757\u3002<\/p>\n<details>\u6211\u4eec\u53ef\u4ee5\u5728\u4e00\u4e2a\u7c7b\u4e2d\u6709\u9759\u6001\u4ee3\u7801\u5757\uff0c\u5728\u7c7b\u52a0\u8f7d\u65f6\u53ea\u6267\u884c\u4e00\u6b21\u3002\u4eceJava 8\u5f00\u59cb\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u63a5\u53e3\u4e2d\u6709\u9759\u6001\u65b9\u6cd5\u7684\u5b9e\u73b0\u3002<\/details>\n<h4>7. \u9009\u62e9\u6240\u6709\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff08OOPS\uff09\u7684\u6838\u5fc3\u6982\u5ff5\u3002<\/h4>\n<p>A. \u62bd\u8c61\u5316<br \/>\nB. \u7ee7\u627f<br \/>\nC. \u63a5\u53e3<br \/>\nD. \u591a\u6001\u6027<br \/>\nE. \u6cdb\u578b <\/p>\n<details>\u70b9\u51fb\u663e\u793a\u7b54\u6848<br \/>\n\u6b63\u786e\u7b54\u6848\uff1aA\u3001B\u3001D<br \/>\nOOPS\u6838\u5fc3\u6982\u5ff5\u5305\u62ec\uff1a<\/p>\n<p>\u62bd\u8c61<br \/>\n\u5c01\u88c5<br \/>\n\u591a\u6001<br \/>\n\u7ee7\u627f<br \/>\n\u7ec4\u5408<br \/>\n\u5173\u8054<br \/>\n\u805a\u5408<\/p>\n<p>\u8be6\u7ec6\u9605\u8bfbOOPS\u6982\u5ff5\uff0c\u8bf7\u70b9\u51fb\u6b64\u5904\u3002<\/details>\n<h4>\u4ee5\u4e0b\u54ea\u4e9b\u9648\u8ff0\u662f\u6709\u5173Java\u7ee7\u627f\u7684\u6b63\u786e\u8bf4\u6cd5\uff1f<\/h4>\n<p>A. Java\u4e2d\u4f7f\u7528\u201cextend\u201d\u5173\u952e\u5b57\u6765\u6269\u5c55\u4e00\u4e2a\u7c7b\u3002<br \/>\nB. \u5728Java\u4e2d\u53ef\u4ee5\u6269\u5c55\u591a\u4e2a\u7c7b\u3002<br \/>\nC. \u5b50\u7c7b\u53ef\u4ee5\u8bbf\u95ee\u7236\u7c7b\u7684\u79c1\u6709\u6210\u5458\u3002<br \/>\nD. \u5728Java\u4e2d\u65e0\u6cd5\u6269\u5c55Final\u7c7b\u3002<\/p>\n<details>\u70b9\u51fb\u5c55\u793a\u7b54\u6848<br \/>\n**\u6b63\u786e\u7b54\u6848\uff1aD**<br \/>\n\u7ee7\u627f\u662fJava\u4e2d\u7684\u6838\u5fc3\u6982\u5ff5\u4e4b\u4e00\u3002\u4f60\u5e94\u8be5\u719f\u6089\u5b83\u3002\u8bf7\u9605\u8bfb\u4ee5\u4e0b\u6587\u7ae0\u4ee5\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7b54\u6848\u9009\u9879\u7684\u5185\u5bb9 &#8211; Java\u4e2d\u7684\u7ee7\u627f\uff0cJava\u4e2d\u7684\u591a\u91cd\u7ee7\u627f\u3002<\/details>\n<h4>\u4ee5\u4e0b\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\u662f\u4ec0\u4e48\uff1f<\/h4>\n<pre class=\"post-pre\"><code>package com.Olivia.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. \u7f16\u8bd1\u65f6\u9519\u8bef<br \/>\nB. \u8d85\u7c7b<br \/>\nC. \u5b50\u7c7b<br \/>\nD. \u8fd0\u884c\u65f6\u9519\u8bef<\/p>\n<details>\u70b9\u51fb\u663e\u793a\u7b54\u6848<br \/>\n**\u6b63\u786e\u7b54\u6848\uff1aA**<br \/>\n\u5b50\u7c7b\u7684foo()\u65b9\u6cd5\u4e0d\u80fd\u662f\u9759\u6001\u7684\uff0c\u5426\u5219\u4f1a\u5728\u7f16\u8bd1\u65f6\u51fa\u9519\u3002\u8fd9\u4e2a\u9759\u6001\u65b9\u6cd5\u65e0\u6cd5\u9690\u85cf\u8d85\u7c7b\u7684\u5b9e\u4f8b\u65b9\u6cd5\u3002<\/details>\n<h4>\u4ee5\u4e0b\u7a0b\u5e8f\u7684\u8f93\u51fa\u4f1a\u662f\u4ec0\u4e48\uff1f<\/h4>\n<pre class=\"post-pre\"><code>package com.Olivia.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. \u5728\u7b2c6\u884c\u7f16\u8bd1\u65f6\u53d1\u751f\u9519\u8bef\u3002<br \/>\nB. \u5728\u7b2c8\u884c\u7f16\u8bd1\u65f6\u53d1\u751f\u9519\u8bef\u3002<br \/>\nC. \u5728\u7b2c6\u884c\u548c\u7b2c8\u884c\u90fd\u53d1\u751f\u7f16\u8bd1\u65f6\u9519\u8bef\u3002<br \/>\nD. \u8fd0\u884c\u6b63\u5e38\uff0c\u6253\u5370\u51fa&#8221;Subclass&#8221;\u4e24\u6b21\u3002<\/p>\n<details>\u70b9\u51fb\u663e\u793a\u7b54\u6848<br \/>\n**\u6b63\u786e\u7b54\u6848\uff1aB**<br \/>\n\u7b2c8\u884c\u7f16\u8bd1\u65f6\u51fa\u9519\uff0c\u56e0\u4e3a\u7236\u7c7b\u7684foo()\u65b9\u6cd5\u662f\u79c1\u6709\u7684\u3002\u9519\u8bef\u6d88\u606f\u4e3aSuper\u7c7b\u578b\u7684foo()\u65b9\u6cd5\u4e0d\u53ef\u89c1\u3002<\/details>\n<h4>\u4ee5\u4e0b\u7a0b\u5e8f\u7684\u8f93\u51fa\u662f\u4ec0\u4e48\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. \u7f16\u8bd1\u65f6\u9519\u8bef<br \/>\nB. \u6253\u5370\u201c\u4f60\u597d\u201d<br \/>\nC. \u8fd0\u884c\u65f6\u9519\u8bef<\/p>\n<details>\u70b9\u51fb\u63ed\u793a\u7b54\u6848<br \/>\n\u6b63\u786e\u7b54\u6848\uff1aA<br \/>\n\u7f16\u8bd1\u65f6\u9519\u8bef\uff0c\u56e0\u4e3a\u5f02\u5e38IOException\u5df2\u88ab\u66ff\u4ee3\u5f02\u5e38\u6355\u83b7\u3002<\/details>\n<h4>12. \u4ee5\u4e0b\u7a0b\u5e8f\u7684\u8f93\u51fa\u7ed3\u679c\u5c06\u662f\u4ec0\u4e48\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  &#8211;  ABABAB<\/p>\n<p>B. abc &#8211; \u4e09\u4e2a\u5b57\u6bcd<\/p>\n<p>C. null &#8211; \u65e0<\/p>\n<details>\u70b9\u51fb\u663e\u793a\u7b54\u6848<br \/>\n**\u6b63\u786e\u7b54\u6848\uff1aB**<br \/>\nx.concat\uff08y\uff09;\u5c06\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\uff0c\u4f46\u5b83\u6ca1\u6709\u88ab\u5206\u914d\u7ed9x\uff0c\u6240\u4ee5x\u7684\u503c\u6ca1\u6709\u6539\u53d8\u3002<\/details>\n<h4>\u4e0b\u5217\u54ea\u4e9b\u662fJava\u4e2d\u7684\u672a\u68c0\u67e5\u5f02\u5e38\uff1f<\/h4>\n<p>A. \u8fd0\u884c\u65f6\u5f02\u5e38<br \/>\nB. \u7c7b\u578b\u8f6c\u6362\u5f02\u5e38<br \/>\nC. \u7a7a\u6307\u9488\u5f02\u5e38<br \/>\nD. \u8f93\u5165\u8f93\u51fa\u5f02\u5e38<\/p>\n<details>\u5355\u51fb\u4ee5\u663e\u793a\u7b54\u6848<br \/>\n**\u6b63\u786e\u7b54\u6848\uff1aA\uff0cB\uff0cC**<br \/>\nRuntimeException\u53ca\u5176\u5b50\u7c7b\u90fd\u662f\u672a\u68c0\u67e5\u5f02\u5e38\u3002\u672a\u68c0\u67e5\u5f02\u5e38\u4e0d\u9700\u8981\u5728\u65b9\u6cd5\u6216\u6784\u9020\u51fd\u6570\u7684throws\u5b50\u53e5\u4e2d\u58f0\u660e\u3002<\/details>\n<h4>\u4ee5\u4e0b\u7a0b\u5e8f\u7684\u8f93\u51fa\u503c\u5c06\u662f\u4ec0\u4e48\uff1f<\/h4>\n<pre class=\"post-pre\"><code>package com.Olivia.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. \u7f16\u8bd1\u65f6\u9519\u8bef<br \/>\nB. \u4f60\u597d<br \/>\nC. \u4f60\u597d\u4e16\u754c<br \/>\nD. \u4f60\u597d\u4f60\u597d\u4e16\u754c<\/p>\n<details>\u7f16\u8bd1\u65f6\u9519\u8bef\uff1aIOException\u7684catch\u5757\u65e0\u6cd5\u8bbf\u95ee\u3002\u56e0\u4e3aException\u7684catch\u5757\u5df2\u7ecf\u5904\u7406\u4e86\u3002<\/details>\n<h4>\u4ee5\u4e0b\u54ea\u79cd\u8bf4\u6cd5\u9002\u7528\u4e8eJava\uff1f<\/h4>\n<p>A. JVM\u8d1f\u8d23\u5c06\u5b57\u8282\u7801\u8f6c\u6362\u4e3a\u7279\u5b9a\u673a\u5668\u4ee3\u7801\u3002<br \/>\nB. \u8fd0\u884cJava\u7a0b\u5e8f\u53ea\u9700\u8981JRE\u3002<br \/>\nC. \u7f16\u8bd1Java\u7a0b\u5e8f\u9700\u8981JDK\u3002<br \/>\nD. JRE\u4e0d\u5305\u542bJVM\u3002<\/p>\n<details>\u70b9\u51fb\u63ed\u793a\u7b54\u6848<br \/>\n\u6b63\u786e\u7b54\u6848\uff1aA\uff0cB\uff0cC<br \/>\n\u8981\u4e86\u89e3\u5b8c\u6574\u89e3\u91ca\uff0c\u8bf7\u9605\u8bfbJDK\uff0cJRE\u548cJVM\u3002<\/details>\n<h4>16. \u5728\u4e00\u4e2aJava\u7c7b\u4e2d\uff0c\u6211\u4eec\u80fd\u591f\u62e5\u6709\u4e24\u4e2a\u4e3b\u8981\u7684\u65b9\u6cd5\u5417\uff1f<\/h4>\n<p>A. \u662f\u7684<br \/>\nB. \u4e0d\u662f<\/p>\n<details>\u70b9\u51fb\u4ee5\u663e\u793a\u7b54\u6848<br \/>\n\u6b63\u786e\u7b54\u6848\uff1aA<br \/>\n\u8fd9\u662f\u4e00\u4e2a\u68d8\u624b\u7684\u95ee\u9898\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u65b9\u6cd5\u91cd\u8f7d\u4f7fJava\u4e2d\u6709\u591a\u4e2a\u540d\u79f0\u4e3a\u201cmain\u201d\u7684\u65b9\u6cd5\u3002<\/details>\n<h4>17. \u5173\u4e8eJava\u4e2d\u7684\u6ce8\u89e3\uff0c\u4ee5\u4e0b\u54ea\u4e9b\u8bf4\u6cd5\u662f\u6b63\u786e\u7684\uff1f<\/h4>\n<p>A. @interface\u5173\u952e\u5b57\u7528\u4e8e\u521b\u5efa\u81ea\u5b9a\u4e49\u6ce8\u89e3\u3002<br \/>\nB. @Override\u662fJava\u4e2d\u7684\u5185\u7f6e\u6ce8\u89e3\u3002<br \/>\nC. \u6ce8\u89e3\u4e0d\u80fd\u5e94\u7528\u4e8e\u7c7b\u4e2d\u7684\u5b57\u6bb5\u3002<br \/>\nD. @Retention\u662fJava\u4e2d\u7684\u5143\u6ce8\u89e3\u4e4b\u4e00\u3002<br \/>\nE. Java\u6ce8\u89e3\u4fe1\u606f\u5728\u7c7b\u7f16\u8bd1\u65f6\u4f1a\u4e22\u5931\u3002<\/p>\n<details>\u70b9\u51fb\u67e5\u770b\u7b54\u6848<br \/>\n**\u6b63\u786e\u7b54\u6848\uff1aA\uff0cB\uff0cD<br \/>\n**<br \/>\n\u8981\u83b7\u53d6\u5b8c\u6574\u7684\u89e3\u91ca\uff0c\u8bf7\u9605\u8bfbJava\u6ce8\u89e3\u3002<\/details>\n<h4>18. \u5173\u4e8eJava\u4e2d\u7684Enum\uff0c\u4e0b\u9762\u54ea\u4e9b\u9648\u8ff0\u662f\u6b63\u786e\u7684\uff1f<\/h4>\n<p>A. \u6240\u6709\u7684Java\u679a\u4e3e\u90fd\u9690\u5f0f\u5730\u7ee7\u627f\u4e86java.lang.Enum\u7c7b\u3002<br \/>\nB. Java\u679a\u4e3e\u53ef\u4ee5\u5b9e\u73b0\u63a5\u53e3\u3002<br \/>\nC. \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528new\u8fd0\u7b97\u7b26\u521b\u5efa\u679a\u4e3e\u7684\u5b9e\u4f8b\u3002<br \/>\nD. \u679a\u4e3e\u4e0d\u80fd\u7528\u4e8eswitch\u8bed\u53e5\u4e2d\u3002<br \/>\nE. \u679a\u4e3e\u5e38\u91cf\u9690\u5f0f\u5730\u662f\u9759\u6001\u548c\u6700\u7ec8\u7684\u3002<\/p>\n<details>\u70b9\u51fb\u4ee5\u663e\u793a\u7b54\u6848<br \/>\n**\u6b63\u786e\u7b54\u6848\uff1aA\uff0cB\uff0cE**<br \/>\n\u9605\u8bfb\u66f4\u591a\u5173\u4e8eJava\u4e2d\u7684Enum\u7684\u5185\u5bb9\u3002<\/details>\n<h4>19. Java\u4e2d\u4ee5\u4e0b\u54ea\u4e9b\u662f\u5185\u7f6e\u7c7b\u52a0\u8f7d\u5668\uff1f<\/h4>\n<p>A. \u5f15\u5bfc\u7c7b\u52a0\u8f7d\u5668<br \/>\nB. \u6269\u5c55\u7c7b\u52a0\u8f7d\u5668<br \/>\nC. \u8fd0\u884c\u65f6\u7c7b\u52a0\u8f7d\u5668<br \/>\nD. \u7cfb\u7edf\u7c7b\u52a0\u8f7d\u5668<\/p>\n<details>\u70b9\u51fb\u63ed\u793a\u7b54\u6848<br \/>\n\u6b63\u786e\u7b54\u6848\uff1aA\u3001B\u3001D<br \/>\n\u9605\u8bfb\u66f4\u591a\u5173\u4e8eJava\u4e2d\u7684\u7c7b\u52a0\u8f7d\u5668\u7684\u5185\u5bb9\uff0c\u8bf7\u8bbf\u95eeClassloaders in Java\u3002<\/details>\n<h4>\u4ee5\u4e0b\u7a0b\u5e8f\u7684\u8f93\u51fa\u5c06\u662f\u4ec0\u4e48\uff1f<\/h4>\n<pre class=\"post-pre\"><code>package com.Olivia.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;\u6d4b\u8bd5\u8c03\u7528toString\u65b9\u6cd5&#8221;<br \/>\nB. \u7f16\u8bd1\u65f6\u9519\u8bef<br \/>\nC. &#8220;Test@7fh2bd8&#8221; (\u6b63\u5728\u8c03\u7528Object\u7c7b\u7684toString()\u65b9\u6cd5)<\/p>\n<details>\u6211\u4eec\u4f1a\u5728\u7f16\u8bd1\u65f6\u51fa\u73b0\u9519\u8bef\uff0c\u56e0\u4e3a\u6211\u4eec\u4e0d\u80fd\u7528static\u5173\u952e\u5b57\u91cd\u5199\u4e00\u4e2aObject\u7c7b\u7684\u65b9\u6cd5\u3002Object\u7c7b\u6709toString()\u65b9\u6cd5\u3002\u4f60\u4f1a\u5f97\u5230\u4e00\u4e2a\u7f16\u8bd1\u65f6\u9519\u8bef\uff0c\u9519\u8bef\u4fe1\u606f\u662f\u201c\u8fd9\u4e2a\u9759\u6001\u65b9\u6cd5\u4e0d\u80fd\u9690\u85cfObject\u4e2d\u7684\u5b9e\u4f8b\u65b9\u6cd5\u201d\u3002<\/details>\n<h4>\u4ee5\u4e0b\u7a0b\u5e8f\u7684\u8f93\u51fa\u5c06\u662f\u4ec0\u4e48\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\u548cs2\u76f8\u7b49\uff1a\u662f<br \/>\nB. \u9519\u8bef<br \/>\nC. s1\u548cs2\u76f8\u7b49\uff1a\u5426<br \/>\nD. \u6b63\u786e<\/p>\n<details>\u70b9\u51fb\u4ee5\u63ed\u793a\u7b54\u6848\uff1a<br \/>\n\u6b63\u786e\u7b54\u6848\uff1aB<br \/>\n\u7ed9\u5b9a\u8bed\u53e5\u7684\u7ed3\u679c\u5c06\u662f\u201cfalse\u201d\uff0c\u56e0\u4e3a\u5728Java\u4e2d\uff0c+\u8fd0\u7b97\u7b26\u7684\u4f18\u5148\u7ea7\u9ad8\u4e8e==\u8fd0\u7b97\u7b26\u3002\u56e0\u6b64\uff0c\u7ed9\u5b9a\u7684\u8868\u8fbe\u5f0f\u5c06\u88ab\u8ba1\u7b97\u4e3a\u201cs1 == s2 is:abc\u201d == \u201cabc\u201d\uff0c\u5373\u4e3afalse\u3002<\/details>\n<h2>\u7ed3\u8bba<\/h2>\n<p>\u5e0c\u671b\u4f60\u559c\u6b22\u8fd9\u4e2aJava\u6838\u5fc3\u77e5\u8bc6\u6d4b\u9a8c\u3002\u5982\u679c\u4f60\u8ba4\u4e3a\u6211\u9057\u6f0f\u4e86\u4e00\u4e9b\u91cd\u8981\u9886\u57df\uff0c\u8bf7\u544a\u8bc9\u6211\uff0c\u6211\u4f1a\u5728\u8fd9\u91cc\u6dfb\u52a0\u66f4\u591a\u6709\u96be\u5ea6\u7684\u6d4b\u9a8c\u95ee\u9898\u3002<\/p>\n<p>\u4e0b\u4e00\u6b21\u6d4b\u9a8c\uff1aJava\u5b57\u7b26\u4e32\u6d4b\u9a8c<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6b22\u8fce\u53c2\u52a0Java\u6838\u5fc3\u77e5\u8bc6\u6d4b\u9a8c\u3002Java\u662f\u4e00\u79cd\u9762\u5411\u5bf9\u8c61\u7684\u7f16\u7a0b\u8bed\u8a00\u3002 Java \u6838\u5fc3\u77e5\u8bc6\u6d4b\u9a8c \u5728\u8fd9\u4e2a\u6d4b\u9a8c\u4e2d\uff0c\u4f60\u5c06\u5728 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-50749","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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