{"id":31532,"date":"2024-01-09T22:18:47","date_gmt":"2023-08-18T21:56:43","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e6%96%b9%e6%b3%95%e7%bb%91%e5%ae%9a%e7%9a%84%e5%86%85%e5%ae%b9\/"},"modified":"2024-05-04T17:35:21","modified_gmt":"2024-05-04T09:35:21","slug":"%e5%85%b3%e4%ba%8ejava%e6%96%b9%e6%b3%95%e7%bb%91%e5%ae%9a%e7%9a%84%e5%86%85%e5%ae%b9","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e6%96%b9%e6%b3%95%e7%bb%91%e5%ae%9a%e7%9a%84%e5%86%85%e5%ae%b9\/","title":{"rendered":"\u5173\u4e8eJava\u65b9\u6cd5\u7ed1\u5b9a\u7684\u5185\u5bb9"},"content":{"rendered":"

\u6211\u4eca\u5929\u6253\u7b97\u5199\u4e00\u7bc7\u5173\u4e8eJava\u65b9\u6cd5\u7ed1\u5b9a\u7684\u6587\u7ae0\u3002\u5e73\u65f6\u5b66\u4e60Java\u65f6\u6ca1\u6709\u7279\u522b\u6ce8\u610f\uff0c\u6240\u4ee5\u8fd9\u6b21\u6211\u51b3\u5b9a\u597d\u597d\u6574\u7406\u4e00\u4e0b\u3002<\/p>\n

\u5148\u5099\u77e5\u8b58<\/h1>\n

\u8ba9\u6211\u4eec\u63d0\u524d\u590d\u4e60\u4e00\u4e0b\u6709\u5173\u4e8eCast\u7684\u77e5\u8bc6\u3002Cast\u5305\u62ec\u663e\u793a\u7c7b\u578b\u8f6c\u6362\u548c\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362\u3002\u8bf7\u8be6\u7ec6\u53c2\u9605\u4ee5\u4e0bURL\u3002
\nhttps:\/\/techacademy.jp\/magazine\/28486
\n\u8fd8\u6709\uff0c\u4e86\u89e3\u4e00\u4e0b\u7f16\u8bd1\u65f6\u548c\u8fd0\u884c\u65f6\u7684\u65f6\u673a\u4e5f\u5f88\u91cd\u8981\u3002\u7f16\u8bd1\u65f6\u662f\u6307\u6211\u4eec\u5199\u7684Java\u6587\u4ef6\u8f6c\u6362\u4e3a\u5b57\u8282\u7801\u7684\u65f6\u673a\u3002\u8fd0\u884c\u65f6\u662f\u6307JVM\u5b9e\u9645\u6267\u884c\u8be5\u5b57\u8282\u7801\u7684\u65f6\u673a\u3002\u5982\u679c\u4f60\u5728Eclipse\u4e0a\u5f00\u53d1\uff0c\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u7f16\u5199\u4ee3\u7801\u540e\u4f1a\u81ea\u52a8\u7f16\u8bd1\uff0c\u5728\u6309\u4e0b\u8fd0\u884c\u6309\u94ae\u7684\u65f6\u5019\u4ee3\u7801\u4f1a\u88ab\u6267\u884c\u3002\u800c\u5728\u7ec8\u7aef\u7b49\u5176\u4ed6\u5f00\u53d1\u73af\u5883\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u7528javac\u547d\u4ee4\u8fdb\u884c\u7f16\u8bd1\u751f\u6210class\u6587\u4ef6\uff0c\u7136\u540e\u518d\u7528java\u547d\u4ee4\u8fdb\u884c\u5b9e\u9645\u6267\u884c\u3002
\n\u6b64\u5916\uff0c\u6587\u7ae0\u4e2d\u4f7f\u7528\u7684\u201c\u7ed1\u5b9a\u201d\u548c\u201c\u8fde\u63a5\u201d\u7b49\u8bcd\u8bed\u90fd\u662f\u540c\u4e00\u4e2a\u610f\u601d\u3002\uff08\u5f88\u5bb9\u6613\u9020\u6210\u6df7\u6dc6\uff0c\u62b1\u6b49\uff09<\/p>\n

\u4ece\u6839\u672c\u4e0a\u8bf4\uff0c\u4ec0\u4e48\u662f\u65b9\u6cd5\u7ed1\u5b9a\uff1f<\/h1>\n

\u6211\u81ea\u5df1\u5e76\u4e0d\u77e5\u9053\u8fd9\u4e2a\u8bcd\u7684\u610f\u601d\uff0c\u4f46\u7b80\u5355\u6765\u8bf4\uff0c\u5728Java\u4e2d\uff0c\u7ed1\u5b9a\u662f\u6307\u5c06\u65b9\u6cd5\u8c03\u7528\u548c\u88ab\u8c03\u7528\u65b9\u6cd5\u7684\u7b7e\u540d\u4ee5\u53ca\u5b9e\u73b0\u90e8\u5206\u5173\u8054\u8d77\u6765\u7684\u673a\u5236\u3002\u7b7e\u540d\u6307\u7684\u662f\u65b9\u6cd5\u540d\u52a0\u53c2\u6570\uff0c\u800c\u5b9e\u73b0\u90e8\u5206\u6307\u7684\u662f{}\u4e2d\u7684\u4ee3\u7801\u5904\u7406\u90e8\u5206\u3002\u65b9\u6cd5\u7531\u8fd9\u4e24\u4e2a\u90e8\u5206\u7ec4\u6210\uff0c\u4f46\u73b0\u5728\u8bf7\u5206\u522b\u8003\u8651\u5b83\u4eec\u3002\u5982\u679c\u4e0d\u7406\u89e3\u8fd9\u4e00\u70b9\uff0c\u53ef\u80fd\u4f1a\u5728\u610f\u60f3\u4e0d\u5230\u7684\u5730\u65b9\u9047\u5230\u95ee\u9898\u3002\u8ba9\u6211\u4eec\u5177\u4f53\u6765\u770b\u3002<\/p>\n

public<\/span> class<\/span> Animal<\/span> {<\/span>\r\n      public<\/span> void<\/span> eat<\/span>(<\/span>double<\/span> quantity<\/span>)<\/span> {<\/span>\r\n             System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u52d5\u7269\u306f\"<\/span> +<\/span> quantity<\/span> +<\/span> \"g\u98df\u3079\u307e\u3057\u305f\u3002\"<\/span>);<\/span>\r\n      }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
public<\/span> class<\/span> Human<\/span> extends<\/span> Animal<\/span> {<\/span>\r\n      public<\/span> void<\/span> eat<\/span>(<\/span>int<\/span> quantity<\/span>)<\/span> {<\/span>\r\n            System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"\u4eba\u9593\u306f\"<\/span> +<\/span> quantity<\/span> +<\/span> \"g\u98df\u3079\u307e\u3057\u305f\u3002\"<\/span>);<\/span>\r\n      }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
public<\/span> class<\/span> Test<\/span> {<\/span>\r\n     public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n           Animal<\/span> animal<\/span> =<\/span> new<\/span> Human<\/span>();<\/span>\r\n           int<\/span> quantity<\/span> =<\/span> 500<\/span>;<\/span>\r\n           animal<\/span>.<\/span>eat<\/span>(<\/span>quantity<\/span>);<\/span>  \/\/ ?<\/span>\r\n     }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5047\u8bbe\u6240\u6709\u7684\u7c7b\u90fd\u5728\u540c\u4e00\u4e2a\u5305\u4e2d\u3002\u5982\u679c\u6267\u884cTest.java\u6587\u4ef6\uff0c\u4f1a\u8f93\u51fa\u4ec0\u4e48\uff1f\u4e3a\u4ec0\u4e48\u4f1a\u8fd9\u6837\uff1f<\/p>\n
\u65b9\u6cd5\u7ed1\u5b9a<\/h1>\n
\u4ee5\u4e0b\u662f\u201c\u7b54\u6848\u662f\u201c\u52a8\u7269\u5403\u4e86500\u514b\u201d\u201d\u7684\u8f93\u51fa\u7ed3\u679c\u3002\u4e3a\u4ec0\u4e48\u4f1a\u8fd9\u6837\u5462\uff1f\u6211\u4e00\u5f00\u59cb\u8ba4\u4e3a\u5e94\u8be5\u8f93\u51fa\u201c\u4eba\u7c7b\u5403\u4e86500\u514b\u201d\uff0c\u56e0\u4e3a\u6211\u7ed9\u4ed6\u7684\u5f15\u7528\u5bf9\u8c61\u662fHuman\u3002\u800c\u4e14\u5728Test\u7c7b\u4e2d\uff0c\u4f20\u9012\u7684\u53c2\u6570\u4e5f\u662fint\u7c7b\u578b\u3002\u4f46\u5b9e\u9645\u4e0a\u7b54\u6848\u662f\u4e0d\u540c\u7684\u3002
\n\u4e3a\u4e86\u7406\u89e3\u53d1\u751f\u4e86\u4ec0\u4e48\uff0c\u8ba9\u6211\u4eec\u6765\u770b\u770b\u5728Java\u4e2d\u65b9\u6cd5\u7ed1\u5b9a\u53d1\u751f\u7684\u65f6\u673a\u3002\u8bf7\u53c2\u8003\u4e0b\u8868\u3002<\/p>\n
\n
\u30e1\u30bd\u30c3\u30c9\u30bf\u30a4\u30d7\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0 \u3000\u5b9f\u884c\u6642\u306b\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0non-static\u30e1\u30bd\u30c3\u30c9\u30e1\u30bd\u30c3\u30c9\u30b7\u30b0\u30cb\u30c1\u30e3\u30e1\u30bd\u30c3\u30c9\u5b9f\u88c5static\u30e1\u30bd\u30c3\u30c9\u30e1\u30bd\u30c3\u30c9\u30b7\u30b0\u30cb\u30c1\u30e3\u3001\u30e1\u30bd\u30c3\u30c9\u5b9f\u88c5<\/div>\n<\/div>\n
\u7531\u4e8e\u672c\u4f8b\u4e2d\u7684eat\u65b9\u6cd5\u662f\u975e\u9759\u6001\u65b9\u6cd5\uff0c\u6211\u6253\u7b97\u4ee5\u6b64\u4e3a\u57fa\u7840\u8fdb\u884c\u89e3\u91ca\uff08\u5373\u4f7f\u662f\u9759\u6001\u65b9\u6cd5\uff0c\u6982\u5ff5\u4e5f\u76f8\u540c\uff09\u3002<\/p>\n
\u7f16\u8bd1\u65f6\u7ed1\u5b9a<\/h1>\n
\u5728Java\u7f16\u8bd1\u65f6\uff0c\u4f1a\u5c06\u8c03\u7528\u7684\u65b9\u6cd5\u548c\u5176\u7b7e\u540d\u5173\u8054\u8d77\u6765\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u53ef\u4ee5\u8bf4\u7f16\u8bd1\u5668\u6bcf\u6b21\u90fd\u4f1a\u786e\u5b9a\u8c03\u7528\u7684\u65b9\u6cd5\u7684\u7b7e\u540d\u3002\u8ba9\u6211\u4eec\u6839\u636e\u5f53\u524d\u6240\u770b\u7684\u4ee3\u7801\u6765\u8003\u8651\u8fd9\u4e2a\u89c4\u5219\u3002Test.java\u7684\u6700\u540e\u4e00\u884c\u662f\u8fd9\u6837\u7684\u3002<\/p>\n
animal<\/span>.<\/span>eat<\/span>(<\/span>quantity<\/span>);<\/span>\r\n<\/code><\/pre>\n
\u9996\u5148\uff0c\u7f16\u8bd1\u5668\u4f1a\u67e5\u770b\u53d8\u91cfanimal\u7684\u58f0\u660e\u7c7b\u578b\u3002animal\u7684\u7c7b\u578b\u662fAnimal\u7c7b\u578b\u3002\u7136\u540e\uff0c\u7f16\u8bd1\u5668\u4f1a\u8bf4\uff1a\u201c\u55ef\uff0c\u55ef\u3002\u8fd9\u4e2a\u53d8\u91cf\u662fAnimal\u7c7b\u7684\u7c7b\u578b\uff0c\u90a3\u4e48\u6211\u6765\u770b\u770b\u8fd9\u4e2a\u7c7b\u4e2d\u662f\u5426\u6709\u6b63\u5728\u8c03\u7528\u7684\u65b9\u6cd5\u3002\u201d\u7f16\u8bd1\u5668\u5f00\u59cb\u641c\u7d22\u3002\u5728\u6b64\u8fc7\u7a0b\u4e2d\uff0c\u8fd8\u4f1a\u5305\u62ec\u4e0e\u6b63\u5728\u8c03\u7528\u7684\u65b9\u6cd5\u517c\u5bb9\u7684\u65b9\u6cd5\u5728\u641c\u7d22\u8303\u56f4\u5185\u3002\u5b9e\u9645\u4e0a\uff0cAnimal\u7c7b\u4e2d\u786e\u5b9e\u6709\u3002<\/p>\n
eat<\/span>(<\/span>double<\/span> quantity<\/span>)<\/span>\r\n<\/code><\/pre>\n
\u5728\u8c03\u7528\u4ee3\u7801\u4e2d\uff0c\u53c2\u6570\u88ab\u4f20\u9012\u4e3aint\u7c7b\u578b\uff0c\u4f46\u662fint\u8f6c\u6362\u4e3adouble\u7684\u8f6c\u6362\u662f\u9690\u5f0f\u8fdb\u884c\u7684(\u65e0\u9700\u663e\u5f0f\u5f3a\u5236\u8f6c\u6362)\uff0c\u7f16\u8bd1\u5668\u4f1a\u5224\u65ad”\u8fd9\u662f\u4e00\u4e2a\u4e0e\u5f53\u524d\u88ab\u8c03\u7528\u7684\u65b9\u6cd5\u517c\u5bb9\u7684\u65b9\u6cd5”\uff0c\u5c06animal.eat(quantity)\u65b9\u6cd5\u8c03\u7528\u4e0e\u63a5\u53d7double\u7c7b\u578b\u53c2\u6570\u7684eat\u65b9\u6cd5(\u7b7e\u540d)\u5173\u8054\u8d77\u6765\u3002\u6b64\u65f6\uff0c\u7f16\u8bd1\u5668\u5df2\u786e\u5b9aeat\u7684\u53c2\u6570\u4e3adouble\u7c7b\u578b\uff0c\u5e76\u4e14\u65e0\u6cd5\u5728\u8fd0\u884c\u65f6\u66f4\u6539\u3002\u8ba9\u6211\u4eec\u5b9e\u9645\u68c0\u9a8c\u4e00\u4e0b\u3002<\/p>\n
Compiled from \"Test.java\"\r\npublic class Test {\r\n  public Test();\r\n    Code:\r\n       0: aload_0\r\n       1: invokespecial #1                  \/\/ Method java\/lang\/Object.\"<init>\":()V\r\n       4: return\r\n\r\n  public static void main(java.lang.String[]);\r\n    Code:\r\n       0: new           #2                  \/\/ class Human\r\n       3: dup\r\n       4: invokespecial #3                  \/\/ Method Human.\"<init>\":()V\r\n       7: astore_1\r\n       8: sipush        500\r\n      11: istore_2\r\n      12: aload_1\r\n      13: iload_2\r\n      14: i2d\r\n      15: invokevirtual #4                  \/\/ Method Animal.eat:(D)V\r\n      18: return\r\n}\r\n<\/code><\/pre>\n
\u5728\u4f7f\u7528\u7ec8\u7aef\u4e2d\u7684javac\u547d\u4ee4\u5206\u522b\u7f16\u8bd1\u6bcf\u4e2a\u6587\u4ef6\u4e4b\u540e\uff0c\u4f7f\u7528javap -c Test\u547d\u4ee4\u6765\u67e5\u770b\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u5185\u5bb9\u3002\u8bf7\u6ce8\u610f\u4ee5\u4e0b\u884c\u7684\u5185\u5bb9\u3002<\/p>\n
15: invokevirtual #4                  \/\/ Method Animal.eat:(D)V\r\n<\/code><\/pre>\n
\u8fd9\u6bb5\u4ee3\u7801\u662f\u5728Test\u7c7b\u4e2d\u7684\u65b9\u6cd5\u8c03\u7528\u90e8\u5206\uff0canimal.eat(quantity)\u4e0e\u4e4b\u5bf9\u5e94\u3002\u5176\u4e2d\uff0c(D)\u8868\u793a\u53c2\u6570\u662fdouble\u7c7b\u578b\uff0c\u800c(V)\u8868\u793a\u8fd4\u56de\u503c\u662fvoid\u7c7b\u578b\u3002invokevirtual\u8868\u793a\u5b9e\u9645\u7684\u5b9e\u73b0\u90e8\u5206\u5728\u8fd0\u884c\u65f6\u786e\u5b9a\u3002\u6839\u636e\u8fd9\u6bb5\u5b57\u8282\u7801\u6307\u4ee4\uff0c\u4ee3\u7801\u4f1a\u5728\u8fd0\u884c\u65f6\u88abRuntime\u6267\u884c\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u7f16\u8bd1\u5668\u53ea\u662f\u5c06\u201c\u88ab\u8c03\u7528\u7684\u65b9\u6cd5\u662fAnimal\u7684eat\u65b9\u6cd5\u201d\u4e0eJVM\u5173\u8054\u8d77\u6765\uff0c\u5177\u4f53\u7684\u5904\u7406\u5185\u5bb9\u5728\u8fd0\u884c\u65f6\u7531JVM\u786e\u5b9a\u3002<\/p>\n
\u8fd0\u884c\u65f6\u7ed1\u5b9a<\/h1>\n
\u53ea\u9700\u6309\u7167\u5b57\u8282\u7801\u7684\u6307\u793a\u6267\u884canimal.eat(quantity)\u65b9\u6cd5\u3002\u4e4b\u524d\uff0c\u7f16\u8bd1\u5668\u4f1a\u67e5\u627eanimal\u53d8\u91cf\u7684\u58f0\u660e\u7c7b\u578b\u3002JVM\u4f1a\u4ece\u88ab\u8d4b\u503c\u7684\u5bf9\u8c61\u5f00\u59cb\u641c\u7d22\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c<\/p>\n
Animal<\/span> animal<\/span> =<\/span> new<\/span> Human<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u7f16\u8bd1\u5668\u53c2\u8003\u4e86\u6b64\u8868\u8fbe\u5f0f\u7684\u5de6\u4fa7\uff08\u52a8\u7269\uff09\u8fdb\u884c\u4e00\u7cfb\u5217\u7ed1\u5b9a\uff0c\u800cJVM\u9996\u5148\u67e5\u627e\u53f3\u4fa7\uff08\u4eba\u7c7b\uff09\u7684\u5bf9\u8c61\u3002
\n\u7136\u540e\uff0c\u7531\u4e8e\u8fd9\u662fHuman\u7c7b\u7684\u5bf9\u8c61\uff0c\u56e0\u6b64JVM\u5728Human\u7c7b\u5185\u90e8\u5c1d\u8bd5\u67e5\u627eeat:(D)V\u65b9\u6cd5\u3002\u53e6\u4e00\u65b9\u9762\uff0cHuman\u7c7b\u4e2d\u5b58\u5728\u7684\u662feat:(I)V\uff08\u5176\u4e2dI\u4ee3\u8868int\u7c7b\u578b\uff09\uff0c\u56e0\u6b64\u627e\u4e0d\u5230\u5339\u914d\u7684\u65b9\u6cd5\u3002\u56e0\u6b64\uff0cJVM\u4f1a\u4ece\u7ee7\u627f\u5173\u7cfb\u4e2d\u7ee7\u7eed\u67e5\u627e\u76f8\u5e94\u7684\u65b9\u6cd5\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5b83\u5c06\u67e5\u770b\u8be5\u7c7b\u7ee7\u627f\u7684\u7236\u7c7b\uff0c\u5982\u679c\u5728\u90a3\u91cc\u627e\u4e0d\u5230\uff0c\u5219\u8fdb\u4e00\u6b65\u67e5\u627e\u7236\u7c7b\uff0c\u4f9d\u6b64\u7c7b\u63a8\uff0c\u4e00\u76f4\u5411\u4e0a\u5c42\u67e5\u627eeat:(D)V\u3002\u5728\u672c\u4f8b\u4e2d\uff0c\u4e0a\u4e00\u7ea7\u662fAnimal\u7c7b\uff0c\u5e76\u4e14\u8be5\u7c7b\u6709\u76f8\u5e94\u7684\u65b9\u6cd5\u5b9e\u73b0\uff0c\u56e0\u6b64\u5c06\u5176\u7ed1\u5b9a\u5230\u8c03\u7528\u65b9\u7684\u65b9\u6cd5\uff08animal.eat(quantity)\uff09\u5e76\u6267\u884c\u5904\u7406\u3002\u7ed3\u679c\u5c31\u662f\u8f93\u51fa\u4e86”\u52a8\u7269\u5403\u4e86500.0\u514b”\u3002<\/p>\n
\u65b9\u6cd5\u7ed1\u5b9a\u7684\u4f8b\u5b50<\/h1>\n
\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u65b9\u6cd5\u7ed1\u5b9a\u7684\u4f8b\u5b50\u3002<\/p>\n
List<\/span><<\/span>Integer<\/span>><\/span> list<\/span> =<\/span> new<\/span> ArrayList<\/span><>();<\/span>\r\nlist<\/span>.<\/span>add<\/span>(<\/span>1<\/span>);<\/span>\r\nlist<\/span>.<\/span>add<\/span>(<\/span>2<\/span>);<\/span>\r\nlist<\/span>.<\/span>add<\/span>(<\/span>3<\/span>);<\/span>\r\nlist<\/span>.<\/span>add<\/span>(<\/span>4<\/span>);<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>list<\/span>);<\/span> \/\/ [1, 2, 3, 4]<\/span>\r\n\r\nlist<\/span>.<\/span>remove<\/span>(<\/span>3<\/span>);<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>list<\/span>);<\/span> \/\/ [1, 2, 3]<\/span>\r\n<\/code><\/pre>\n
\u5728List\u7c7b\u7684remove\u65b9\u6cd5\u4e2d\uff0c\u5b58\u5728\u4e24\u79cd\u4e0d\u540c\u7c7b\u578b\u7684\u53c2\u6570\u91cd\u8f7d\u65b9\u6cd5\uff0c\u5373List.remove(int index)\u548cList.remove(Object o)\uff08https:\/\/docs.oracle.com\/javase\/jp\/8\/docs\/api\/java\/util\/List.html\uff09\u3002\u5728\u8fd9\u91cc\uff0c\u7531\u4e8e\u4f20\u5165\u4e86\u4e00\u4e2aint\u7c7b\u578b\u7684\u53c2\u6570\uff0c\u6240\u4ee5\u5728\u7f16\u8bd1\u65f6\u4f1a\u7ed1\u5b9a\u5230list.remove(3)\u548cList.remove(int index)\uff0c\u7136\u540e\u5728\u8fd0\u884c\u65f6\u4f1a\u7ed1\u5b9a\u5230ArrayList.remove(int index)\u7684\u5177\u4f53\u5b9e\u73b0\u90e8\u5206\u3002\u7ed3\u679c\u662f\uff0c\u8be5\u5217\u8868\u4e2d\u7d22\u5f15\u4e3a3\u7684\u4f4d\u7f6e\u4e0a\u7684\u5143\u7d204\u88ab\u5220\u9664\uff0c\u8f93\u51fa\u4e3a[1, 2, 3]\u3002
\n\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u6ca1\u6709\u4ec0\u4e48\u7279\u522b\u7684\u6539\u53d8\u3002\u4f46\u662f\u4e0b\u4e00\u4e2a\u4f8b\u5b50\u5462\uff1f<\/p>\n
Collection<\/span><<\/span>Integer<\/span>><\/span> list<\/span> =<\/span> new<\/span> ArrayList<\/span><>();<\/span>\r\nlist<\/span>.<\/span>add<\/span>(<\/span>1<\/span>);<\/span>\r\nlist<\/span>.<\/span>add<\/span>(<\/span>2<\/span>);<\/span>\r\nlist<\/span>.<\/span>add<\/span>(<\/span>3<\/span>);<\/span>\r\nlist<\/span>.<\/span>add<\/span>(<\/span>4<\/span>);<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>list<\/span>);<\/span> \/\/ [1, 2, 3, 4]<\/span>\r\n\r\nlist<\/span>.<\/span>remove<\/span>(<\/span>3<\/span>);<\/span>\r\nSystem<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>list<\/span>);<\/span> \/\/ [1, 2, 4] \u2190 ??<\/span>\r\n\r\n<\/code><\/pre>\n
\u53ea\u6709\u4e00\u4e2a\u9009\u9879
\n\u53ea\u6709\u4e00\u4e2a\u4e1c\u897f\u53d8\u4e86\uff0clist\u7684\u5bb9\u5668\u4eceList\u7c7b\u578b\u53d8\u6210\u4e86Collection\u7c7b\u578b\u3002\u7ed3\u679c\u663e\u793a\u4e3a[1, 2, 4]\u3002\u4e0d\u662f\u7b2c\u4e09\u4e2a\u7d22\u5f15\u88ab\u5220\u9664\uff0c\u800c\u662f\u6570\u5b573\u672c\u8eab\u88ab\u5220\u9664\u3002\u8fd9\u662f\u56e0\u4e3aCollection\u53ea\u6709\u4e00\u4e2aremove\u65b9\u6cd5\uff0c\u5373Collection.remove(Object o)\u3002\u7f16\u8bd1\u5668\u5c06\u6b64\u5bf9\u8c61\u7c7b\u578b\u7684remove\u65b9\u6cd5\u4e0elist.remove(3)\u7ed1\u5b9a\u3002\u56e0\u6b64\uff0clist.remove(3)\u7684\u53c2\u65703\u5c06\u88ab\u89c6\u4e3a\u5bf9\u8c61\u800c\u4e0d\u662f\u7d22\u5f15\u3002\u5b9e\u9645\u4e0a\uff0c\u5982\u679c\u4f7f\u7528javap\u547d\u4ee4\u9a8c\u8bc1\uff0c\u5c06\u663e\u793aCollection.remove:(Ljava\/lang\/Object;)Z\uff08Z\u8868\u793a\u5e03\u5c14\u7c7b\u578b\uff09\u3002\u7136\u540e\uff0c\u6839\u636e\u5b57\u8282\u7801\u6307\u4ee4\uff0c\u7531JVM\u6267\u884c\u7684\u4e0d\u662fArrayList.remove(int index)\uff0c\u800c\u662fArrayList.remove(Object o)\u3002\u7ed3\u679c\uff0c[1, 2, 4]\u88ab\u663e\u793a\u5728\u5c4f\u5e55\u4e0a\u3002\u5982\u679c\u4e0d\u4e86\u89e3\u65b9\u6cd5\u7ed1\u5b9a\uff0c\u53ef\u80fd\u4f1a\u7f16\u5199\u7a0b\u5e8f\u5047\u8bbe\u7b2c\u4e09\u4e2a\u7d22\u5f15\u88ab\u5220\u9664\u3002\u5982\u679c\u662f\u8fd9\u6837\uff0c\u5c06\u4f1a\u5bfc\u81f4\u6545\u969c\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u6211\u8ba4\u4e3a\u4e86\u89e3\u8fd9\u4e2a\u673a\u5236\u6709\u5f88\u5927\u7684\u597d\u5904\uff0c\u5e76\u5199\u4e0b\u4e86\u672c\u6587\u3002\u975e\u5e38\u611f\u8c22\u60a8\u9605\u8bfb\u5230\u8fd9\u91cc\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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