{"id":202747,"date":"2025-05-22T08:23:00","date_gmt":"2025-05-22T00:23:00","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202747\/"},"modified":"2025-05-22T08:23:00","modified_gmt":"2025-05-22T00:23:00","slug":"%e5%a6%82%e4%bd%95%e5%88%a9%e7%94%a8%e5%87%bd%e6%95%b0%e5%bc%8f%e7%bc%96%e7%a8%8b%e4%bc%98%e5%8c%96java%e4%bb%a3%e7%a0%81%e7%bb%93%e6%9e%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202747\/","title":{"rendered":"\u5982\u4f55\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u5316Java\u4ee3\u7801\u7ed3\u6784\uff1f"},"content":{"rendered":"

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

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\u5077\u5077\u52aa\u529b\uff0c\u6084\u65e0\u58f0\u606f\u5730\u53d8\u5f3a\uff0c\u7136\u540e\u60ca\u8273\u6240\u6709\u4eba\uff01\u54c8\u54c8\uff0c\u5c0f\u4f19\u4f34\u4eec\u53c8\u6765\u5b66\u4e60\u5566~\u4eca\u5929\u6211\u5c06\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u300a\u5982\u4f55\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u5316Java\u4ee3\u7801\u7ed3\u6784\uff1f\u300b<\/span>\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e3b\u8981\u4f1a\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u4e0d\u77e5\u9053\u5927\u5bb6\u5bf9\u5176\u90fd\u6709\u591a\u5c11\u4e86\u89e3\uff0c\u4e0b\u9762\u6211\u4eec\u5c31\u4e00\u8d77\u6765\u770b\u4e00\u5427\uff01\u5f53\u7136\uff0c\u975e\u5e38\u5e0c\u671b\u5927\u5bb6\u80fd\u591a\u591a\u8bc4\u8bba\uff0c\u7ed9\u51fa\u5408\u7406\u7684\u5efa\u8bae\uff0c\u6211\u4eec\u4e00\u8d77\u5b66\u4e60\uff0c\u4e00\u8d77\u8fdb\u6b65\uff01<\/p>\n

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<\/p>\n

\u5982\u4f55\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u5316 Java \u4ee3\u7801\u7ed3\u6784<\/strong><\/p>\n

\u51fd\u6570\u5f0f\u7f16\u7a0b\u8303\u5f0f\u63d0\u5021\u4f7f\u7528\u4e0d\u53d8\u5f0f\u3001\u7eaf\u51fd\u6570\u548c\u4e00\u7b49\u51fd\u6570\uff0c\u5b83\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8 Java \u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u53ef\u8bfb\u6027\u3002<\/p>\n

\u4e0d\u53ef\u53d8\u6027<\/strong><\/p>\n

\u4e0d\u53ef\u53d8\u6027\u610f\u5473\u7740\u5bf9\u8c61\u4e00\u65e6\u521b\u5efa\uff0c\u5176\u72b6\u6001\u5c31\u65e0\u6cd5\u66f4\u6539\u3002\u8fd9\u6709\u52a9\u4e8e\u6d88\u9664\u5e76\u53d1\u95ee\u9898\u5e76 \u0443\u043f\u0440\u043e\u0441\u0442\u0438\u0442\u044c \u6d4b\u8bd5\u548c\u8c03\u8bd5\u3002<\/p>\n

\/\/ \u53ef\u53d8\u7c7b\npublic class MutableCls {\n    private int counter;\n\n    public void increment() {\n        counter++; \/\/ \u4fee\u6539\u5185\u90e8\u72b6\u6001\n    }\n}<\/pre>\n
\/\/ \u4e0d\u53ef\u53d8\u7c7b\npublic class ImmutableCls {\n    private final int counter;\n\n    public ImmutableCls(int value) {\n        this.counter = value;\n    }\n\n    public ImmutableCls increment() {\n        return new ImmutableCls(counter + 1); \/\/ \u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u4e0d\u53ef\u53d8\u5bf9\u8c61\n    }\n}<\/pre>\n
\u7eaf\u51fd\u6570<\/strong><\/p>\n
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\/\/ \u4e0d\u7eaf\u51fd\u6570\npublic int impureFun(int x) {\n    return sideEffect(); \/\/ \u4ea7\u751f\u526f\u4f5c\u7528\n}<\/pre>\n
\/\/ \u7eaf\u51fd\u6570\npublic int pureFun(int x) {\n    return x * x; \/\/ \u65e0\u526f\u4f5c\u7528\n}<\/pre>\n
\u4e00\u7b49\u51fd\u6570<\/strong><\/p>\n
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\/\/ Lambda \u8868\u8fbe\u5f0f\u4f5c\u4e3a\u51fd\u6570\u53c2\u6570\npublic int sum(List<Integer> nums, Predicate<Integer> filter) {\n    return nums.stream()\n               .filter(filter)\n               .mapToInt(Integer::valueOf)\n               .sum();\n}<\/pre>\n
\/\/ \u51fd\u6570\u4f5c\u4e3a\u51fd\u6570\u8fd4\u56de\u503c\npublic Function<Integer, Integer> doubler() {\n    return x -> x * 2;\n}<\/pre>\n
\u5b9e\u6218\u6848\u4f8b\uff1a\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u4f18\u5316\u5217\u8868\u5904\u7406<\/strong><\/p>\n
\u5047\u8bbe\u6211\u4eec\u8981\u4ece\u5458\u5de5\u5217\u8868\u4e2d\u627e\u51fa\u5e74\u85aa\u8d85\u8fc7 100,000 \u7f8e\u5143\u7684\u5458\u5de5\u59d3\u540d\uff1a<\/p>\n
\/\/ \u4f20\u7edf\u65b9\u6cd5\uff1a\u8fed\u4ee3\u548c\u6761\u4ef6\u68c0\u67e5\nList<String> names = new ArrayList<>();\nfor (Employee emp : employees) {\n    if (emp.getSalary() > 100000) {\n        names.add(emp.getName());\n    }\n}<\/pre>\n
\/\/ \u51fd\u6570\u5f0f\u65b9\u6cd5\uff1a\u6d41\u3001\u8fc7\u6ee4\u5668\u548c\u6620\u5c04\nList<String> names = employees.stream()\n                             .filter(emp -> emp.getSalary() > 100000)\n                             .map(Employee::getName)\n                             .toList();<\/pre>\n
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