{"id":1132,"date":"2022-10-24T22:48:53","date_gmt":"2022-10-24T14:48:53","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1132"},"modified":"2022-11-27T12:39:49","modified_gmt":"2022-11-27T04:39:49","slug":"%e5%b8%b8%e7%94%a8%e7%b1%bb-java%e6%af%94%e8%be%83%e5%99%a8%e6%a6%82%e8%bf%b0%e3%80%81comparable%e8%87%aa%e7%84%b6%e6%8e%92%e5%ba%8f%e4%b8%be%e4%be%8b%e3%80%81%e8%87%aa%e5%ae%9a%e4%b9%89%e7%b1%bb","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1132","title":{"rendered":"\u5e38\u7528\u7c7b-Java\u6bd4\u8f83\u5668\u6982\u8ff0\u3001Comparable\u81ea\u7136\u6392\u5e8f\u4e3e\u4f8b\u3001\u81ea\u5b9a\u4e49\u7c7b\u5b9e\u73b0Comparable\u81ea\u7136\u6392\u5e8f\u3001\u4f7f\u7528Comparator\u5b9e\u73b0\u5b9a\u5236\u6392\u5e8f"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P490;\r\n\r\nimport org.junit.jupiter.api.Test;\r\n\r\nimport java.util.Arrays;\r\nimport java.util.Comparator;\r\n\r\n\/**\r\n * \u4e00\u3001\u8bf4\u660e\uff1aJava\u4e2d\u7684\u5bf9\u8c61\uff0c\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0c\u53ea\u80fd\u8fdb\u884c\u6bd4\u8f83\uff1a== \u6216 != \u3002\u4e0d\u80fd\u4f7f\u7528 > \u6216 &lt; \u7684\r\n *          \u4f46\u662f\u5728\u5f00\u53d1\u573a\u666f\u4e2d\uff0c\u6211\u4eec\u9700\u8981\u5bf9\u591a\u4e2a\u5bf9\u8c61\u8fdb\u884c\u6392\u5e8f\uff0c\u8a00\u5916\u4e4b\u610f\uff0c\u5c31\u9700\u8981\u6bd4\u8f83\u5bf9\u8c61\u7684\u5927\u5c0f\u3002\r\n *          \u5982\u4f55\u5b9e\u73b0\uff1f\u4f7f\u7528\u4e24\u4e2a\u63a5\u53e3\u4e2d\u7684\u4efb\u4f55\u4e00\u4e2a\uff1aComparable \u6216 Comparator\r\n *\r\n * \u4e8c\u3001Comparable\u63a5\u53e3\u4e0eComparator\u7684\u4f7f\u7528\u7684\u5bf9\u6bd4\uff1a\r\n *     Comparable\u63a5\u53e3\u7684\u65b9\u5f0f\u4e00\u65e6\u4e00\u5b9a\uff0c\u4fdd\u8bc1Comparable\u63a5\u53e3\u5b9e\u73b0\u7c7b\u7684\u5bf9\u8c61\u5728\u4efb\u4f55\u4f4d\u7f6e\u90fd\u53ef\u4ee5\u6bd4\u8f83\u5927\u5c0f\u3002\r\n *     Comparator\u63a5\u53e3\u5c5e\u4e8e\u4e34\u65f6\u6027\u7684\u6bd4\u8f83\u3002\r\n *\r\n * @author RichieZhang\r\n * @create 2022-10-23 \u4e0b\u5348 9:10\r\n *\/\r\npublic class CompareTest {\r\n\r\n    \/*\r\n    Comparable\u63a5\u53e3\u7684\u4f7f\u7528\u4e3e\u4f8b\uff1a  \u81ea\u7136\u6392\u5e8f\r\n    1.\u50cfString\u3001\u5305\u88c5\u7c7b\u7b49\u5b9e\u73b0\u4e86Comparable\u63a5\u53e3\uff0c\u91cd\u5199\u4e86compareTo(obj)\u65b9\u6cd5\uff0c\u7ed9\u51fa\u4e86\u6bd4\u8f83\u4e24\u4e2a\u5bf9\u8c61\u5927\u5c0f\u7684\u65b9\u5f0f\u3002\r\n    2.\u50cfString\u3001\u5305\u88c5\u7c7b\u91cd\u5199compareTo()\u65b9\u6cd5\u4ee5\u540e\uff0c\u8fdb\u884c\u4e86\u4ece\u5c0f\u5230\u5927\u7684\u6392\u5217\r\n    3.\u91cd\u5199compareTo(obj)\u7684\u89c4\u5219\uff1a\r\n        \u5982\u679c\u5f53\u524d\u5bf9\u8c61this\u5927\u4e8e\u5f62\u53c2\u5bf9\u8c61obj\uff0c\u5219\u8fd4\u56de\u6b63\u6574\u6570\uff0c\r\n        \u5982\u679c\u5f53\u524d\u5bf9\u8c61this\u5c0f\u4e8e\u5f62\u53c2\u5bf9\u8c61obj\uff0c\u5219\u8fd4\u56de\u8d1f\u6574\u6570\u3002\r\n        \u5982\u679c\u5f53\u524d\u5bf9\u8c61this\u7b49\u4e8e\u5f62\u53c2\u5bf9\u8c61obj\uff0c\u5219\u8fd4\u56de\u96f6\u3002\r\n    4.\u5bf9\u4e8e\u81ea\u5b9a\u4e49\u7c7b\u6765\u8bf4\uff0c\u5982\u679c\u9700\u8981\u6392\u5e8f\uff0c\u6211\u4eec\u53ef\u4ee5\u8ba9\u81ea\u5b9a\u4e49\u7c7b\u5b9e\u73b0Comparable\u63a5\u53e3\uff0c\u91cd\u5199compareTo(obj)\u65b9\u6cd5\r\n      \u5728compareTo(obj)\u65b9\u6cd5\u4e2d\u6307\u660e\u5982\u4f55\u6392\u5e8f\r\n\r\n     *\/\r\n\r\n    @Test\r\n    public  void test1(){\r\n        String&#91;] arr = new String&#91;]{\"AA\",\"CC\",\"KK\",\"MM\",\"GG\",\"JJ\",\"DD\"};\r\n\r\n        Arrays.sort(arr);\r\n\r\n        System.out.println(Arrays.toString(arr));\r\n    }\r\n\r\n    @Test\r\n    public void test2(){\r\n        Goods&#91;] arr = new Goods&#91;5];\r\n        arr&#91;0] = new Goods(\"lenovoMouse\",34);\r\n        arr&#91;1] = new Goods(\"dellMouse\",43);\r\n        arr&#91;2] = new Goods(\"xiaomiMouse\",12);\r\n        arr&#91;3] = new Goods(\"huaweiMouse\",65);\r\n        arr&#91;4] = new Goods(\"microsoftMouse\",43);\r\n\r\n        Arrays.sort(arr);\r\n\r\n        System.out.println(Arrays.toString(arr));\r\n    }\r\n\r\n    \/*\r\n    Comparator\u63a5\u53e3\u7684\u4f7f\u7528\uff1a\u5b9a\u5236\u6392\u5e8f\r\n    1.\u80cc\u666f\uff1a\r\n    \u5f53\u5143\u7d20\u7684\u7c7b\u578b\u6ca1\u6709\u5b9e\u73b0java.lang.Comparable\u63a5\u53e3\u53c8\u4e0d\u65b9\u4fbf\u4fee\u6539\u4ee3\u7801\u3002\r\n    \u6216\u8005\u5b9e\u73b0\u4e86java.lang.Comparable\u63a5\u53e3\u7684\u6392\u5e8f\u89c4\u5219\u4e0d\u9002\u5408\u5f53\u524d\u7684\u64cd\u4f5c\u3002\r\n    \u90a3\u4e48\u53ef\u4ee5\u8003\u8651\u4f7f\u7528Comparator\u7684\u5bf9\u8c61\u6765\u6392\u5e8f\r\n    2.\u91cd\u5199compare(Object o1,Object o2)\u65b9\u6cd5\uff0c\u6bd4\u8f83o1\u548co2\u7684\u5927\u5c0f\uff1a\r\n    \u5982\u679c\u65b9\u6cd5\u8fd4\u56de\u6b63\u6574\u6570\uff0c\u5219\u8868\u793ao1\u5927\u4e8eo2\uff1b\r\n    \u5982\u679c\u8fd4\u56de0\uff0c\u8868\u793a\u76f8\u7b49\uff1b\r\n    \u8fd4\u56de\u8d1f\u6574\u6570\uff0c\u8868\u793ao1\u5c0f\u4e8eo2\u3002\r\n\r\n     *\/\r\n\r\n    @Test\r\n    public void test3(){\r\n        String&#91;] arr = new String&#91;]{\"AA\",\"CC\",\"KK\",\"MM\",\"GG\",\"JJ\",\"DD\"};\r\n        Arrays.sort(arr,new Comparator(){\r\n\r\n            \/\/\u6309\u7167\u5b57\u7b26\u4e32\u4ece\u5927\u5230\u5c0f\u7684\u987a\u5e8f\u6392\u5217\r\n            @Override\r\n            public int compare(Object o1, Object o2) {\r\n                if (o1 instanceof String &amp;&amp; o2 instanceof String){\r\n                    String s1 = (String) o1;\r\n                    String s2 = (String) o2;\r\n                    return -s1.compareTo(s2);\r\n                }\r\n\/\/                return 0;\r\n                throw new RuntimeException(\"\u8f93\u5165\u7684\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u81f4\");\r\n            }\r\n        });\r\n        System.out.println(Arrays.toString(arr));\r\n    }\r\n\r\n    @Test\r\n    public void test4(){\r\n        Goods&#91;] arr = new Goods&#91;6];\r\n        arr&#91;0] = new Goods(\"lenovoMouse\",34);\r\n        arr&#91;1] = new Goods(\"dellMouse\",43);\r\n        arr&#91;2] = new Goods(\"xiaomiMouse\",12);\r\n        arr&#91;3] = new Goods(\"huaweiMouse\",65);\r\n        arr&#91;4] = new Goods(\"huaweiMouse\",224);\r\n        arr&#91;5] = new Goods(\"microsoftMouse\",43);\r\n\r\n        Arrays.sort(arr, new Comparator() {\r\n            \/\/\u6307\u660e\u5546\u54c1\u6bd4\u8f83\u5927\u5c0f\u7684\u65b9\u5f0f:\u6309\u7167\u4ea7\u54c1\u540d\u79f0\u4ece\u4f4e\u5230\u9ad8\u6392\u5e8f,\u518d\u6309\u7167\u4ef7\u683c\u4ece\u9ad8\u5230\u4f4e\u6392\u5e8f\r\n            @Override\r\n            public int compare(Object o1, Object o2) {\r\n                if (o1 instanceof Goods &amp;&amp; o2 instanceof Goods){\r\n                    Goods g1 = (Goods) o1;\r\n                    Goods g2 = (Goods) o2;\r\n                    if (g1.getName().equals(g2.getName())){\r\n                        return -Double.compare(g1.getPrice(),g2.getPrice());\r\n                    }else {\r\n                        return g1.getName().compareTo(g2.getName());\r\n                    }\r\n                }\r\n\r\n                throw new RuntimeException(\"\u8f93\u5165\u7684\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u81f4\");\r\n            }\r\n        });\r\n\r\n        System.out.println(Arrays.toString(arr));\r\n    }\r\n\r\n}\r\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P490;\r\n\r\n\/**\r\n * \u5546\u54c1\u7c7b\r\n *\r\n * @author RichieZhang\r\n * @create 2022-10-23 \u4e0b\u5348 9:27\r\n *\/\r\npublic class Goods implements Comparable{\r\n\r\n    private String name;\r\n    private double price;\r\n\r\n    public Goods() {\r\n    }\r\n\r\n    public Goods(String name, double price) {\r\n        this.name = name;\r\n        this.price = price;\r\n    }\r\n\r\n    public String getName() {\r\n        return name;\r\n    }\r\n\r\n    public void setName(String name) {\r\n        this.name = name;\r\n    }\r\n\r\n    public double getPrice() {\r\n        return price;\r\n    }\r\n\r\n    public void setPrice(double price) {\r\n        this.price = price;\r\n    }\r\n\r\n    @Override\r\n    public String toString() {\r\n        return \"Goods{\" +\r\n                \"name='\" + name + '\\'' +\r\n                \", price=\" + price +\r\n                '}';\r\n    }\r\n\r\n    \/\/\u6307\u660e\u5546\u54c1\u6bd4\u8f83\u5927\u5c0f\u7684\u65b9\u5f0f:\u6309\u7167\u4ef7\u683c\u4ece\u4f4e\u5230\u9ad8\u6392\u5e8f,\u518d\u6309\u7167\u4ea7\u54c1\u540d\u79f0\u4ece\u9ad8\u5230\u4f4e\u6392\u5e8f\r\n    @Override\r\n    public int compareTo(Object o) {\r\n        System.out.println(\"**********************************\");\r\n        if (o instanceof Goods){\r\n            \/\/\u65b9\u5f0f\u4e00\uff1a\r\n            Goods goods = (Goods) o;\r\n            if (this.price > goods.price){\r\n                return 1;\r\n            }else if (this.price &lt; goods.price){\r\n                return -1;\r\n            }else {\r\n\/\/                return 0;\r\n                return -this.name.compareTo(goods.name);\r\n            }\r\n\r\n            \/\/\u65b9\u5f0f\u4e8c\uff1a\r\n\/\/            return Double.compare(this.price,goods.price);\r\n        }\r\n\r\n        throw new RuntimeException(\"\u4f20\u5165\u7684\u6570\u636e\u7c7b\u578b\u4e0d\u4e00\u81f4\uff01\");\r\n\r\n    }\r\n}\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[46],"class_list":["post-1132","post","type-post","status-publish","format-standard","hentry","category-java-code","tag-java"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1132"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1132"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1132\/revisions"}],"predecessor-version":[{"id":1133,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1132\/revisions\/1133"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1132"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1132"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1132"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}