{"id":31393,"date":"2024-02-06T15:32:32","date_gmt":"2023-10-05T23:57:17","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e8%ae%bf%e9%97%ae%e6%8e%a7%e5%88%b6%e3%80%82\/"},"modified":"2025-08-12T23:48:46","modified_gmt":"2025-08-12T15:48:46","slug":"%e5%85%b3%e4%ba%8ejava%e8%ae%bf%e9%97%ae%e6%8e%a7%e5%88%b6%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%85%b3%e4%ba%8ejava%e8%ae%bf%e9%97%ae%e6%8e%a7%e5%88%b6%e3%80%82\/","title":{"rendered":"\u5173\u4e8eJava\u8bbf\u95ee\u63a7\u5236"},"content":{"rendered":"

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\u9996\u5148<\/h2>\n

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\u7ec8\u70b9<\/h2>\n

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\n
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\u4f7f\u7528\u5b9e\u4f8b\uff08\u516c\u5171\u548c\u79c1\u4eba\uff09<\/h2>\n

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\n\u4f8b\u5982\uff0c\u8003\u8651\u4ee5\u4e0b\u7c7b\uff1a\n<\/p>\n

public<\/span> class<\/span> Rectangle<\/span> {<\/span>\r\n\r\n    private<\/span> double<\/span> width<\/span>;<\/span>\r\n\r\n    private<\/span> double<\/span> height<\/span>;<\/span>\r\n\r\n    public<\/span> Rectangle<\/span>(<\/span>double<\/span> w<\/span>,<\/span> double<\/span> h<\/span>)<\/span> {<\/span>\r\n        this<\/span>.<\/span>width<\/span> =<\/span> w<\/span>;<\/span>\r\n        this<\/span>.<\/span>height<\/span> =<\/span> h<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> double<\/span> area<\/span>()<\/span> {<\/span>\r\n        return<\/span> this<\/span>.<\/span>width<\/span> *<\/span> this<\/span>.<\/span>height<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
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\/\/ \u4ed6\u306e\u30af\u30e9\u30b9<\/span>\r\npublic<\/span> class<\/span> RectangleAction1<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n\r\n        Rectangle<\/span> r<\/span> =<\/span> new<\/span> Rectangle<\/span>(<\/span>1.0<\/span>,<\/span> 2.0<\/span>);<\/span>\r\n        \/\/                              --OK<\/span>\r\n\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"area = \"<\/span> +<\/span> r<\/span>.<\/span>area<\/span>());<\/span>\r\n        \/\/                              --OK<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7136\u800c\uff0c\u5bf9\u4e8e\u6807\u6709 private \u7684 double \u7c7b\u578b\u7684\u5b57\u6bb5 height\uff0c\u65e0\u6cd5\u4ece\u5176\u4ed6\u7c7b\u8fdb\u884c\u8bbf\u95ee\u3002<\/p>\n
\/\/ \u4ed6\u306e\u30af\u30e9\u30b9<\/span>\r\npublic<\/span> class<\/span> RectangleAction2<\/span> {<\/span>\r\n    public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n\r\n        Rectangle<\/span> r<\/span> =<\/span> new<\/span> Rectangle<\/span>(<\/span>1.0<\/span>,<\/span> 2.0<\/span>);<\/span>\r\n        \/\/                             --OK<\/span>\r\n\r\n        \/\/ private \u306a\u306e\u3067\u3069\u3061\u3089\u3082\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc<\/span>\r\n        r<\/span>.<\/span>width<\/span> =<\/span> 3.0<\/span>;<\/span>\r\n        r<\/span>.<\/span>height<\/span> =<\/span> 4.0<\/span>\r\n\r\n        System<\/span>.<\/span>out<\/span>.<\/span>println<\/span>(<\/span>\"area = \"<\/span> +<\/span> r<\/span>.<\/span>area<\/span>());<\/span>\r\n        \/\/                             --OK<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u4f7f\u7528private\u5173\u952e\u5b57\uff0c\u6709\u4e00\u4e2a\u597d\u5904\u662f\u201c\u4e0d\u4f1a\u88ab\u610f\u5916\u5730\u4fee\u6539\u5e0c\u671b\u4fdd\u6301\u4e0d\u53d8\u7684\u4fe1\u606f\u201d\uff0c\u53e6\u5916\uff0c\u5982\u679c\u4e0d\u5c0f\u5fc3\u5c1d\u8bd5\u4fee\u6539\uff0c\u7f16\u8bd1\u9519\u8bef\u4f1a\u8ba9\u4f60\u77e5\u9053\u8fd9\u662f\u7a0b\u5e8f\u9519\u8bef\uff0c\u4e0d\u9700\u8981\u518d\u989d\u5916\u8fd0\u884c\u7a0b\u5e8f\u6765\u786e\u8ba4\u3002<\/p>\n
\u4f46\u662f\uff0cprivate\u5173\u952e\u5b57\u4e5f\u5141\u8bb8\u5728\u540c\u4e00\u7c7b\u4e2d\u8bfb\u53d6\u548c\u4fee\u6539\u4fe1\u606f\u3002<\/p>\n
public<\/span> class<\/span> Rectangle<\/span> {<\/span>\r\n\r\n    private<\/span> double<\/span> width<\/span>;<\/span>\r\n\r\n    private<\/span> double<\/span> height<\/span>;<\/span>\r\n\r\n    public<\/span> Rectangle<\/span>(<\/span>double<\/span> w<\/span>,<\/span> double<\/span> h<\/span>)<\/span> {<\/span>\r\n        \/\/ \u81ea\u5206\u306e\u30af\u30e9\u30b9\u304b\u3089\u306f\u66f8\u304d\u8fbc\u3081\u307e\u3059<\/span>\r\n        this<\/span>.<\/span>width<\/span> =<\/span> w<\/span>;<\/span>\r\n        this<\/span>.<\/span>height<\/span> =<\/span> h<\/span>;<\/span>\r\n    }<\/span>\r\n\r\n    public<\/span> double<\/span> area<\/span>()<\/span> {<\/span>\r\n        \/\/ \u81ea\u5206\u306e\u30af\u30e9\u30b9\u304b\u3089\u306f\u8aad\u307f\u51fa\u305b\u307e\u3059<\/span>\r\n        return<\/span> this<\/span>.<\/span>width<\/span> *<\/span> this<\/span>.<\/span>height<\/span>;<\/span>\r\n    }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6700\u540e<\/h2>\n
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