{"id":203502,"date":"2025-05-22T13:44:28","date_gmt":"2025-05-22T05:44:28","guid":{"rendered":"https:\/\/server.hk\/cnblog\/203502\/"},"modified":"2025-05-22T13:44:28","modified_gmt":"2025-05-22T05:44:28","slug":"java-%e7%ba%bf%e7%a8%8b%e5%b9%b6%e5%8f%91%e9%97%ae%e9%a2%98%ef%bc%9a%e4%b8%ba%e4%bb%80%e4%b9%88-head-first-java-%e4%b8%ad%e7%9a%84-bankaccount-%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a0%81%e4%bc%9a%e5%87%ba","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/203502\/","title":{"rendered":"Java \u7ebf\u7a0b\u5e76\u53d1\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48 Head First Java \u4e2d\u7684 BankAccount \u793a\u4f8b\u4ee3\u7801\u4f1a\u51fa\u73b0\u7ebf\u7a0b\u8f93\u51fa\u4ece\u4e2d\u95f4\u5f00\u59cb\u7684\u60c5\u51b5\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

Java \u7ebf\u7a0b\u5e76\u53d1\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48 Head First Java \u4e2d\u7684 BankAccount \u793a\u4f8b\u4ee3\u7801\u4f1a\u51fa\u73b0\u7ebf\u7a0b\u8f93\u51fa\u4ece\u4e2d\u95f4\u5f00\u59cb\u7684\u60c5\u51b5\uff1f<\/h1>\n

\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587\u300aJava \u7ebf\u7a0b\u5e76\u53d1\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48 Head First Java \u4e2d\u7684 BankAccount \u793a\u4f8b\u4ee3\u7801\u4f1a\u51fa\u73b0\u7ebf\u7a0b\u8f93\u51fa\u4ece\u4e2d\u95f4\u5f00\u59cb\u7684\u60c5\u51b5\uff1f\u300b<\/span>\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a\u6587\u7ae0<\/span>\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~<\/p>\n

<\/p>\n

java\u7ebf\u7a0b\u95ee\u9898\uff1ahead first java \u4e2d\u7684\u793a\u4f8b<\/strong><\/p>\n

\u793a\u4f8b\u4ee3\u7801\u4e2d\uff0c\u4e24\u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bbf\u95ee\u5171\u4eab\u7684 bankaccount \u5bf9\u8c61\u7684\u4f59\u989d\u3002\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u6267\u884c makewithdrawal \u65b9\u6cd5\u65f6\uff0c\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u53ef\u80fd\u6b63\u5728\u6267\u884c\u540c\u6837\u7684\u64cd\u4f5c\u3002\u8fd9\u53ef\u80fd\u5bfc\u81f4\u5e76\u53d1\u95ee\u9898\uff0c\u4f8b\u5982\u4f59\u989d\u88ab\u9519\u8bef\u5730\u51cf\u5c11\u3002<\/p>\n

\u8fd0\u884c\u7a0b\u5e8f\u65f6\uff0c\u6709\u65f6\u4f1a\u89c2\u5bdf\u5230\u4e00\u4e2a\u7ebf\u7a0b\u7684\u8f93\u51fa\u4ece makewithdrawal \u65b9\u6cd5\u7684\u4e2d\u95f4\u5f00\u59cb\u3002\u8fd9\u79cd\u884c\u4e3a\u662f\u56e0\u4e3a java \u7ebf\u7a0b\u662f\u534f\u4f5c\u5f0f\u7684\uff0c\u8fd9\u610f\u5473\u7740\u5b83\u4eec\u53ef\u4ee5\u968f\u65f6\u88ab\u4e2d\u65ad\u6216\u6682\u505c\u3002<\/p>\n

\u5728\u793a\u4f8b\u4ee3\u7801\u4e2d\uff0c\u7b2c\u4e00\u4e2a\u7ebf\u7a0b\u8fdb\u5165\u7761\u7720\u72b6\u6001\uff0c\u5c06\u6267\u884c\u6743\u8ba9\u7ed9\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u3002\u7136\u800c\uff0c\u7b2c\u4e8c\u4e2a\u7ebf\u7a0b\u4e0d\u4e00\u5b9a\u7acb\u5373\u4ece\u5934\u5f00\u59cb\u6267\u884c\u3002java \u7ebf\u7a0b\u8c03\u5ea6\u7a0b\u5e8f\u51b3\u5b9a\u4e86\u54ea\u4e2a\u7ebf\u7a0b\u5c06\u5728\u4f55\u65f6\u6267\u884c\u3002<\/p>\n

\u56e0\u6b64\uff0c\u7b2c\u4e8c\u4e2a\u7ebf\u7a0b\u53ef\u80fd\u5728\u7b2c\u4e00\u4e2a\u7ebf\u7a0b\u7684 makewithdrawal \u65b9\u6cd5\u7684\u4e2d\u95f4\u90e8\u5206\u5f00\u59cb\u6267\u884c\u3002\u8fd9\u662f\u56e0\u4e3a\u8c03\u5ea6\u7a0b\u5e8f\u5728\u7b2c\u4e00\u4e2a\u7ebf\u7a0b\u8c03\u7528 sleep() \u65b9\u6cd5\u65f6\u62a2\u5360\u4e86\u5b83\uff0c\u5e76\u5c06\u6267\u884c\u6743\u5206\u914d\u7ed9\u4e86\u7b2c\u4e8c\u4e2a\u7ebf\u7a0b\u3002<\/p>\n

\u4e3a\u4e86\u89e3\u51b3\u5e76\u53d1\u95ee\u9898\uff0c\u9700\u8981\u4f7f\u7528\u7ebf\u7a0b\u540c\u6b65\u673a\u5236\u3002\u5728\u793a\u4f8b\u4ee3\u7801\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 synchronized \u5173\u952e\u5b57\u6765\u540c\u6b65\u5bf9 bankaccount \u5bf9\u8c61\u7684\u8bbf\u95ee\uff0c\u9632\u6b62\u4e24\u4e2a\u7ebf\u7a0b\u540c\u65f6\u4fee\u6539\u4f59\u989d\u3002<\/p>\n

public class BankAccount {\n  private int balance = 100;\n\n  public int getBalance() {\n    synchronized(this) {\n      return balance;\n    }\n  }\n\n  public void withdraw(int amount) {\n    synchronized(this) {\n      balance = balance - amount;\n    }\n  }\n}<\/pre>\n
\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6587\u7ae0\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n","protected":false},"excerpt":{"rendered":"
Java \u7ebf\u7a0b\u5e76\u53d1\u95ee\u9898\uff1a\u4e3a\u4ec0\u4e48 ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-203502","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203502","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=203502"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/203502\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=203502"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=203502"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=203502"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}