{"id":31287,"date":"2022-11-05T17:21:31","date_gmt":"2023-10-16T02:33:42","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e5%8f%af%e6%af%94%e8%be%83%e5%99%a8-comparable-%e5%92%8c%e6%af%94%e8%be%83%e5%99%a8-comparator-%e7%9a%84%e7%ac%94%e8%ae%b0\/"},"modified":"2025-08-12T23:15:24","modified_gmt":"2025-08-12T15:15:24","slug":"java-%e5%8f%af%e6%af%94%e8%be%83%e5%99%a8-comparable-%e5%92%8c%e6%af%94%e8%be%83%e5%99%a8-comparator-%e7%9a%84%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/java-%e5%8f%af%e6%af%94%e8%be%83%e5%99%a8-comparable-%e5%92%8c%e6%af%94%e8%be%83%e5%99%a8-comparator-%e7%9a%84%e7%ac%94%e8%ae%b0\/","title":{"rendered":"[Java] \u53ef\u6bd4\u8f83\u5668 (Comparable) \u548c\u6bd4\u8f83\u5668 (Comparator) \u7684\u7b14\u8bb0."},"content":{"rendered":"<h1>\u4e3a\u4e86\u4ec0\u4e48<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5927\u5c0f\u6bd4\u8f03\u3092\u3059\u308b java.util.Comparator \u3068 java.lang.Comparable \u306b\u95a2\u3059\u308b\u30af\u30e9\u30b9\u30fb\u30e1\u30bd\u30c3\u30c9\u306e\u6574\u7406<\/ul>\n<\/li>\n<\/ul>\n<p>Comparator \u3084 Comparable \u3092\u5b9f\u88c5\u3059\u308b\u5834\u5408\u306e\u6ce8\u610f\u70b9\u3092\u6574\u7406<\/p>\n<h1>\u57fa\u672c\u7684\u8bf4\u8bdd<\/p>\n<h2>\u53ef\u6bd4\u8f83\u7684\uff0c\u6bd4\u8f83\u5668\u5171\u4eab<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u3044\u308f\u3086\u308b\u300c\u5b87\u5b99\u8239\u6f14\u7b97\u5b50\u300d &lt;=&gt; \u3068\u540c\u3058\u3088\u3046\u306a\u3082\u306e\u2192 Wikipedia: \u5b87\u5b99\u8239\u6f14\u7b97\u5b50<\/ul>\n<\/li>\n<\/ul>\n<p>\u5927\u5c0f\u6bd4\u8f03\u3059\u308b<br \/>\n\u30bd\u30fc\u30c8\u3001\u30d0\u30a4\u30ca\u30ea\u30b5\u30fc\u30c1\u3059\u308b\u5834\u5408\u3001max\/min \u306a\u3069\u3092\u6c42\u3081\u308b\u5834\u5408\u3001\u30c4\u30ea\u30fc\u69cb\u9020( TreeSet , TreeMap )\u3092\u4f5c\u308b\u969b\u306a\u3069\u306b\u3082\u4f7f\u308f\u308c\u308b<br \/>\n\u57fa\u672c\u7684\u306b equals() \u3068\u77db\u76fe\u3057\u306a\u3044\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u308b\uff08\u3082\u3057 equals() \u3068\u4e92\u63db\u6027\u304c\u306a\u3044\u5834\u5408\u306b\u306f\u3001\u305d\u306e\u65e8\u3092javadoc\u306b\u660e\u8a18\u3059\u308b\u3053\u3068\uff09<br \/>\n\u57fa\u672c\u7684\u306b Serializable \u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u63a8\u5968\u3055\u308c\u308b<\/p>\n<h2>\u300cComparable\u300d\u662f\u6307\u53ef\u6bd4\u8f83\u7684\u610f\u601d\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u81ea\u5206\u81ea\u8eab\u3068\u3001\u5225\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u306e\u5927\u5c0f\u6bd4\u8f03\u3092\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>Comparable \u3092\u5b9f\u88c5\u3057\u3066\u3044\u308b\u3068\u300c\u81ea\u7136\u306a\u9806\u5e8f\u4ed8\u3051\u300d\u304c\u3067\u304d\u308b<\/p>\n<h2>\u6bd4\u8f83\u5668\u662f\u6307<\/p>\n<ul class=\"post-ul\">2 \u3064\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5927\u5c0f\u6bd4\u8f03\u3092\u3059\u308b<\/ul>\n<h1>\u4fbf\u5229\u7684\u65b9\u6cd5 l\u00ec de<\/p>\n<ul class=\"post-ul\">java.util.Collections#reverseOrder()<\/ul>\n<p>\u6709\u4e00\u4e9b\u63a5\u53d7\u53c2\u6570\u7684\uff0c\u4e00\u4e9b\u4e0d\u63a5\u53d7\u53c2\u6570\u7684\u3002<br \/>\n\u63a5\u53d7\u53c2\u6570\u7684\u5c06\u8fd4\u56de\u6307\u5b9a\u6bd4\u8f83\u5668\u7684\u9006\u5e8f\u6bd4\u8f83\u5668\u3002<br \/>\n\u4e0d\u63a5\u53d7\u53c2\u6570\u7684\u5c06\u8fd4\u56de\u81ea\u7136\u987a\u5e8f\u7684\u9006\u5e8f\u6bd4\u8f83\u5668\u3002<\/p>\n<pre class=\"post-pre\"><code>        <span class=\"c1\">\/\/ \u81ea\u7136\u306a\u9806\u5e8f\u306e\u9006\u9806<\/span>\r\n\t\t<span class=\"nc\">Comparator<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">c1<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Collections<\/span><span class=\"o\">.<\/span><span class=\"na\">reverseOrder<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"c1\">\/\/ \u6307\u5b9a\u3055\u308c\u305f Comparator \u306e\u9006\u9806<\/span>\r\n\t\t<span class=\"nc\">Comparator<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">c2<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Collections<\/span><span class=\"o\">.<\/span><span class=\"na\">reverseOrder<\/span><span class=\"o\">(<\/span><span class=\"n\">c1<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u4eceJava 8\u5f00\u59cb\uff0cComparator\u4e2d\u4e5f\u6dfb\u52a0\u4e86\u4e0e\u76f8\u540c\u76ee\u7684\u7684\u65b9\u6cd5\u3002<\/p>\n<ul class=\"post-ul\">java.util.Comparator#reverseOrder()<\/ul>\n<p>\u8fd4\u56de\u4e0e\u524d\u8ff0\u7684\u65e0\u53c2\u6570 Collections\uff03reverseOrder\uff08\uff09\u76f8\u540c\u7684\u81ea\u7136\u987a\u5e8f\u7684\u9006\u5e8f\u6bd4\u8f83\u5668\u3002\u6211\u8ba4\u4e3a Comparator \u7cfb\u5217\u7684\u65b9\u6cd5\u90fd\u88ab\u96c6\u6210\u5230\u4e86 Comparator \u63a5\u53e3\u4e2d\u3002<\/p>\n<pre class=\"post-pre\"><code>        <span class=\"c1\">\/\/ \u81ea\u7136\u306a\u9806\u5e8f\u306e\u9006\u9806<\/span>\r\n\t\t<span class=\"nc\">Comparator<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">c3<\/span><span class=\"o\">=<\/span> <span class=\"nc\">Comparator<\/span><span class=\"o\">.<\/span><span class=\"na\">reverseOrder<\/span><span class=\"o\">();<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">java.util.Comparator#reversed()<\/ul>\n<p>\u8fd4\u56de\u4e0e\u524d\u9762\u63d0\u5230\u7684\u5177\u6709\u53c2\u6570\u7684Collections#reverseOrder()\u76f8\u53cd\u7684Comparator\u3002\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\u5b83\u4e0d\u9488\u5bf9\u4f20\u5165\u7684\u5b9e\u4f8b\u8fdb\u884c\u64cd\u4f5c\uff0c\u800c\u662f\u5b9e\u4f8b\u672c\u8eab\u7684\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>        <span class=\"c1\">\/\/ \u81ea\u5206\u306e\u9006\u9806<\/span>\r\n        <span class=\"nc\">Comparator<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">c4<\/span> <span class=\"o\">=<\/span> <span class=\"n\">c3<\/span><span class=\"o\">.<\/span><span class=\"na\">reversed<\/span><span class=\"o\">();<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">java.util.Comparator#naturalOrder()<\/ul>\n<p>\u53ef\u4ee5\u83b7\u53d6\u4e00\u4e2a\u81ea\u7136\u987a\u5e8f\u7684Comparator\u3002<\/p>\n<ul class=\"post-ul\">java.util.Comparator#comparing()<\/ul>\n<p>\u751f\u6210Comparator\u7528\u4e8e\u4eceobject\u4e2d\u63d0\u53d6\u503c\u5e76\u8fdb\u884c\u6bd4\u8f83\u3002\u901a\u5e38\u4f7f\u7528lambda\u8868\u8fbe\u5f0f\u6216\u65b9\u6cd5\u5f15\u7528\u6765\u6307\u5b9a\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Bean<\/span> <span class=\"o\">{<\/span>\r\n\t<span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">data1<\/span><span class=\"o\">;<\/span>\r\n\r\n\t<span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getData1<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">data1<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/ ...<\/span>\r\n\r\n    <span class=\"nc\">Comparator<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Bean<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">c5<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Comparator<\/span><span class=\"o\">.<\/span><span class=\"na\">comparing<\/span><span class=\"o\">(<\/span><span class=\"nl\">Bean:<\/span><span class=\"o\">:<\/span><span class=\"n\">getData1<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u4e5f\u6709\u539f\u59cb\u7248\u672c\u7684comparingInt(), comparingLong(), comparingDouble()\u7b49\u7b49\u3002<\/p>\n<ul class=\"post-ul\">java.util.Comparator#thenComparing()<\/ul>\n<p>\u53ef\u4ee5\u901a\u8fc7\u7ec4\u5408\u6bd4\u8f83\u5668\uff0c\u5f53\u7b2c\u4e00\u4e2a\u6bd4\u8f83\u5668\u7684\u7ed3\u679c\u4e3a0\uff08\u8868\u793a\u76f8\u7b49\uff09\u65f6\uff0c\u4f7f\u7528\u7b2c\u4e8c\u4e2a\u6bd4\u8f83\u5668\u7684\u7ed3\u679c\u3002<br \/>\n\u4f60\u8fd8\u53ef\u4ee5\u7ec4\u5408\u4e09\u4e2a\u4ee5\u4e0a\u7684\u6bd4\u8f83\u5668\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Bean<\/span> <span class=\"o\">{<\/span>\r\n\t<span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">data1<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">data2<\/span><span class=\"o\">;<\/span>\r\n\r\n\t<span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getData1<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">data1<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\r\n\t<span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getData2<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">data2<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"c1\">\/\/ ...<\/span>\r\n\r\n    <span class=\"nc\">Comparator<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Bean<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">c6<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Comparator<\/span><span class=\"o\">.<\/span><span class=\"na\">comparing<\/span><span class=\"o\">(<\/span><span class=\"nl\">Bean:<\/span><span class=\"o\">:<\/span><span class=\"n\">getData1<\/span><span class=\"o\">)<\/span>\r\n            <span class=\"o\">.<\/span><span class=\"na\">thenComparing<\/span><span class=\"o\">(<\/span><span class=\"nl\">Bean:<\/span><span class=\"o\">:<\/span><span class=\"n\">getData2<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>java.util.Comparator#nullsFirst() , nullsLast()<\/p>\n<p>\u5c06\u4f20\u9012\u7684Comparator\u53c2\u6570\u53d8\u4e3anull\u5b89\u5168\u3002\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u7684\u533a\u522b\u5728\u4e8e\u5c06null\u6761\u76ee\u653e\u7f6e\u5728\u975enull\u6761\u76ee\u7684\u524d\u9762\uff08nullsFirst\uff09\u8fd8\u662f\u540e\u9762\uff08nullsLast\uff09\u3002<\/p>\n<ul class=\"post-ul\">java.lang.String#CASE_INSENSITIVE_ORDER<\/ul>\n<p>\u5728String\u7c7b\u4e2d\uff0c\u6709\u4e00\u4e2a\u7528\u4e8e\u5ffd\u7565\u5927\u5c0f\u5199\u7684\u5927\u5c0f\u6bd4\u8f83\u7684Comparator\u5df2\u7ecf\u4f5c\u4e3a\u5e38\u91cf\u51c6\u5907\u597d\u4e86\u3002<\/p>\n<h2>\u5bf9\u4e8e Map.Entry \u7684\u6bd4\u8f83<br \/>\nJava 8 \u63d0\u4f9b\u4e86\u901a\u8fc7 Map.Entry \u7684\u952e\u6216\u503c\u8fdb\u884c\u6bd4\u8f83\u7684\u7b80\u4fbf\u65b9\u6cd5\u3002\u6211\u8ba4\u4e3a\u8fd9\u53ef\u80fd\u662f\u4e3a\u4e86\u5728 Stream \u7b49\u573a\u666f\u4e0b\u4f7f\u7528\u3002<\/p>\n<p>java.util.Map.Entry#comparingByKey()<\/p>\n<p>java.util.Map.Entry#comparingByKey(Comparator&lt;? super K&gt;)<\/p>\n<p>java.util.Map.Entry#comparingByValue()<\/p>\n<p>java.util.Map.Entry#comparingByValue(Comparator&lt;? super K&gt;)<\/p>\n<p>java.util.Objects#compare()<\/p>\n<p>\u5728Objects\u7c7b\u4e2d\uff0c\u6709\u4e00\u4e2a\u540d\u4e3acompare()\u7684\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u68c0\u67e5\u5bf9\u8c61\u7684\u5927\u5c0f\u3002\u5b9e\u73b0\u4e86Comparable\u63a5\u53e3\u7684\u5bf9\u8c61\u53ef\u4ee5\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n<p>\u5728\u5b9e\u73b0\u72ec\u7acb\u7c7b\u7684 Comparable \u6216 Comparator \u65f6\uff0c\u6bd4\u8f83\u6210\u5458\u53d8\u91cf\u65f6\u975e\u5e38\u65b9\u4fbf\u3002<br \/>\n\u6b64\u5916\uff0c\u5728\u4f7f\u7528 lambda \u8868\u8fbe\u5f0f\u521b\u5efa Comparator \u65f6\u4e5f\u975e\u5e38\u65b9\u4fbf\u3002<\/p>\n<p>java.lang.Integer#compare() , java.lang.Long#compare() \u306a\u3069<\/p>\n<p>\u7c7b\u4f3c\u7684\u65b9\u6cd5\u4e5f\u9002\u7528\u4e8e\u5e03\u5c14\u3001\u5b57\u8282\u3001\u5b57\u7b26\u3001\u77ed\u6574\u578b\u3001\u6574\u578b\u3001\u957f\u6574\u578b\u3001\u6d6e\u70b9\u578b\u3001\u53cc\u7cbe\u5ea6\u7b49\u539f\u59cb\u7c7b\u578b\u7684\u5305\u88c5\u7c7b\u3002<\/p>\n<h1>\u8bf7\u6ce8\u610f<\/p>\n<h2>\u4e0eequals()\u65b9\u6cd5\u76f8\u7b26\u5728\u5b9e\u73b0Comparable\u6216Comparator\u63a5\u53e3\u65f6\uff0c\u5e76\u4e0d\u4e00\u5b9a\u9700\u8981\u4ea7\u751f\u4e0eequals()\u65b9\u6cd5\u4e0d\u4e00\u81f4\u7684\u7ed3\u679c\u3002<br \/>\n\u5b9e\u9645\u4e0a\uff0c\u5373\u4f7f\u5728\u6807\u51c6\u5e93\u4e2d\uff0c\u6709\u4e00\u4e9b\u5b9e\u73b0\u4e86Comparable\u63a5\u53e3\u7684\u7c7b\u4e5f\u4f1a\u8fd4\u56de\u4e0eequals()\u65b9\u6cd5\u4e0d\u517c\u5bb9\u7684\u7ed3\u679c\uff08\u4f8b\u5982java.math.BigDecimal\uff09\u3002<\/p>\n<p>\u7136\u800c\uff0c\u5efa\u8bae\u8fd4\u56de\u7684\u7ed3\u679c\u4e0d\u4e0eequals()\u76f8\u77db\u76fe\u3002<\/p>\n<p>\u539f\u56e0\u5728\u4e8e\u4e00\u4e9b\u6807\u51c6\u5e93\uff0c\u5982TreeSet\u548cTreeMap\uff0c\u5c06Comparable\uff08\u6216Comparator\uff09\u8fd4\u56de\u4e3a0\u548cequals()\u8fd4\u56de\u4e3atrue\u89c6\u4e3a\u76f8\u540c\u7684\u5904\u7406\u65b9\u5f0f\u3002<\/p>\n<p>\u5047\u8bbe\u5b9e\u73b0\u4e86Comparable\u63a5\u53e3\u7684\u7c7b\u6709\u4e09\u4e2a\u6210\u5458\u53d8\u91cfdata1\uff0cdata2\u548cdata3\uff0c\u5e76\u4e14equals()\u65b9\u6cd5\u4f7f\u7528\u8fd9\u4e09\u4e2a\u6210\u5458\u53d8\u91cf\u8fdb\u884c\u5224\u5b9a\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff08\u5373\u4f7f\u53ea\u6709data1\u548cdata2\u4f5c\u4e3a\u6392\u5e8f\u6761\u4ef6\u5df2\u7ecf\u8db3\u591f\uff09\uff0c\u5728compareTo()\u65b9\u6cd5\u4e2d\u4e5f\u9700\u8981\u4f7f\u7528\u76f8\u540c\u7684\u4e09\u4e2a\u6210\u5458\u53d8\u91cf\u8fdb\u884c\u5224\u5b9a\u3002<\/p>\n<p>\u5426\u5219\uff0c\u4f1a\u51fa\u73b0\u5728 data1 \u548c data2 \u76f8\u540c\u65f6\uff0c\u4f46 data3 \u4e0d\u540c\u7684\u60c5\u51b5\u4e0b\uff0c\u5c06\u5176\u89c6\u4e3a\u952e\u91cd\u590d\u5e76\u4e22\u5f03\u5176\u4e2d\u4e00\u4e2a\u7684\u60c5\u51b5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">final<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Bean<\/span> <span class=\"kd\">implements<\/span> <span class=\"nc\">Comparable<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Bean<\/span><span class=\"o\">&gt;,<\/span> <span class=\"nc\">Serializable<\/span> <span class=\"o\">{<\/span>\r\n\r\n\t<span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"kd\">final<\/span> <span class=\"kt\">long<\/span> <span class=\"n\">serialVersionUID<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span><span class=\"o\">;<\/span>\r\n\r\n\t<span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">data1<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">data2<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">data3<\/span><span class=\"o\">;<\/span>\r\n\r\n\t<span class=\"nd\">@Override<\/span>\r\n\t<span class=\"kd\">public<\/span> <span class=\"kt\">int<\/span> <span class=\"nf\">hashCode<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"nc\">Objects<\/span><span class=\"o\">.<\/span><span class=\"na\">hash<\/span><span class=\"o\">(<\/span><span class=\"n\">data1<\/span><span class=\"o\">,<\/span> <span class=\"n\">data2<\/span><span class=\"o\">,<\/span> <span class=\"n\">data3<\/span><span class=\"o\">);<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\r\n\t<span class=\"nd\">@Override<\/span>\r\n\t<span class=\"kd\">public<\/span> <span class=\"kt\">boolean<\/span> <span class=\"nf\">equals<\/span><span class=\"o\">(<\/span><span class=\"nc\">Object<\/span> <span class=\"n\">other<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"k\">this<\/span> <span class=\"o\">==<\/span> <span class=\"n\">other<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"k\">return<\/span> <span class=\"kc\">true<\/span><span class=\"o\">;<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\t\t<span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">other<\/span> <span class=\"k\">instanceof<\/span> <span class=\"nc\">Bean<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"nc\">Bean<\/span> <span class=\"n\">that<\/span> <span class=\"o\">=<\/span> <span class=\"o\">(<\/span><span class=\"nc\">Bean<\/span><span class=\"o\">)<\/span> <span class=\"n\">other<\/span><span class=\"o\">;<\/span>\r\n\t\t\t<span class=\"k\">return<\/span> <span class=\"nc\">Objects<\/span><span class=\"o\">.<\/span><span class=\"na\">equals<\/span><span class=\"o\">(<\/span><span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">data1<\/span><span class=\"o\">,<\/span> <span class=\"n\">that<\/span><span class=\"o\">.<\/span><span class=\"na\">data1<\/span><span class=\"o\">)<\/span>\r\n\t\t\t\t\t<span class=\"o\">&amp;&amp;<\/span> <span class=\"nc\">Objects<\/span><span class=\"o\">.<\/span><span class=\"na\">equals<\/span><span class=\"o\">(<\/span><span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">data2<\/span><span class=\"o\">,<\/span> <span class=\"n\">that<\/span><span class=\"o\">.<\/span><span class=\"na\">data2<\/span><span class=\"o\">)<\/span>\r\n\t\t\t\t\t<span class=\"o\">&amp;&amp;<\/span> <span class=\"nc\">Objects<\/span><span class=\"o\">.<\/span><span class=\"na\">equals<\/span><span class=\"o\">(<\/span><span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">data3<\/span><span class=\"o\">,<\/span> <span class=\"n\">that<\/span><span class=\"o\">.<\/span><span class=\"na\">data3<\/span><span class=\"o\">);<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"kc\">false<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\r\n\t<span class=\"nd\">@Override<\/span>\r\n\t<span class=\"kd\">public<\/span> <span class=\"kt\">int<\/span> <span class=\"nf\">compareTo<\/span><span class=\"o\">(<\/span><span class=\"nc\">Bean<\/span> <span class=\"n\">that<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"nc\">Comparator<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">naturalOrder<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Comparator<\/span><span class=\"o\">.<\/span><span class=\"na\">naturalOrder<\/span><span class=\"o\">();<\/span>\r\n\t\t<span class=\"kt\">int<\/span> <span class=\"n\">rc<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Objects<\/span><span class=\"o\">.<\/span><span class=\"na\">compare<\/span><span class=\"o\">(<\/span><span class=\"n\">data1<\/span><span class=\"o\">,<\/span> <span class=\"n\">that<\/span><span class=\"o\">.<\/span><span class=\"na\">data1<\/span><span class=\"o\">,<\/span> <span class=\"n\">naturalOrder<\/span><span class=\"o\">);<\/span>\r\n\t\t<span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">rc<\/span> <span class=\"o\">==<\/span> <span class=\"mi\">0<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t<span class=\"n\">rc<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Objects<\/span><span class=\"o\">.<\/span><span class=\"na\">compare<\/span><span class=\"o\">(<\/span><span class=\"n\">data2<\/span><span class=\"o\">,<\/span> <span class=\"n\">that<\/span><span class=\"o\">.<\/span><span class=\"na\">data2<\/span><span class=\"o\">,<\/span> <span class=\"n\">naturalOrder<\/span><span class=\"o\">);<\/span>\r\n\t\t\t<span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">rc<\/span> <span class=\"o\">==<\/span> <span class=\"mi\">0<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t\t\t<span class=\"n\">rc<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Objects<\/span><span class=\"o\">.<\/span><span class=\"na\">compare<\/span><span class=\"o\">(<\/span><span class=\"n\">data3<\/span><span class=\"o\">,<\/span> <span class=\"n\">that<\/span><span class=\"o\">.<\/span><span class=\"na\">data3<\/span><span class=\"o\">,<\/span> <span class=\"n\">naturalOrder<\/span><span class=\"o\">);<\/span>\r\n\t\t\t<span class=\"o\">}<\/span>\r\n\t\t<span class=\"o\">}<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">rc<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u4f7f\u5176\u53ef\u4ee5\u8fdb\u884c\u5e8f\u5217\u5316\u3002<br \/>\n\u5728\u5b9e\u73b0\u6bd4\u8f83\u5668\u65f6\uff0c\u540c\u6837\u5efa\u8bae\u5c06\u5176\u57fa\u672c\u7c7b\u578b\u8bbe\u4e3a\u53ef\u5e8f\u5217\u5316\u3002<\/p>\n<p>\u4e3a\u4e86\u786e\u4fdd\u5728\u8bbe\u7f6e\u4e86\u6bd4\u8f83\u5668\uff08Comparator\uff09\u540e\u5bf9TreeMap\u6216TreeSet\u7b49\u8fdb\u884c\u5e8f\u5217\u5316\u65f6\u4e0d\u4f1a\u51fa\u73b0\u95ee\u9898\u3002<\/p>\n<p>\u751f\u6210\u7684Comparator\u662f\u6807\u51c6\u5e93\u751f\u6210\u7684\uff0c\u5f53\u7136\u662f\u53ef\u5e8f\u5217\u5316\u7684\u3002<br \/>\n\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u666e\u901a\u7684lambda\u8868\u8fbe\u5f0f\u6216\u8005\u65b9\u6cd5\u5f15\u7528\u7b49\uff08\u9664\u975e\u8fdb\u884c\u4ea4\u53c9\u7c7b\u578b\u8f6c\u6362\uff09\uff0c\u662f\u4e0d\u53ef\u5e8f\u5217\u5316\u7684\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">final<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Bean<\/span> <span class=\"kd\">implements<\/span> <span class=\"nc\">Comparable<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Bean<\/span><span class=\"o\">&gt;,<\/span> <span class=\"nc\">Serializable<\/span> <span class=\"o\">{<\/span>\r\n\r\n    <span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"kd\">final<\/span> <span class=\"kt\">long<\/span> <span class=\"n\">serialVersionUID<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"kd\">static<\/span> <span class=\"kd\">final<\/span> <span class=\"nc\">Comparator<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Bean<\/span><span class=\"o\">&gt;<\/span> <span class=\"no\">COMPARATOR<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">Comparator<\/span><span class=\"o\">.<\/span><span class=\"na\">comparing<\/span><span class=\"o\">(<\/span><span class=\"nl\">Bean:<\/span><span class=\"o\">:<\/span><span class=\"n\">getData1<\/span><span class=\"o\">)<\/span>\r\n\t\t\t<span class=\"o\">.<\/span><span class=\"na\">thenComparing<\/span><span class=\"o\">(<\/span><span class=\"nl\">Bean:<\/span><span class=\"o\">:<\/span><span class=\"n\">getData2<\/span><span class=\"o\">)<\/span>\r\n\t\t\t<span class=\"o\">.<\/span><span class=\"na\">thenComparing<\/span><span class=\"o\">(<\/span><span class=\"nl\">Bean:<\/span><span class=\"o\">:<\/span><span class=\"n\">getData3<\/span><span class=\"o\">);<\/span>\r\n\r\n\t<span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">data1<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">data2<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">data3<\/span><span class=\"o\">;<\/span>\r\n\r\n\t<span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getData1<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">data1<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\r\n\t<span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getData2<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">data2<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\r\n\t<span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">getData3<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"n\">data3<\/span><span class=\"o\">;<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n\r\n\t<span class=\"nd\">@Override<\/span>\r\n\t<span class=\"kd\">public<\/span> <span class=\"kt\">int<\/span> <span class=\"nf\">compareTo<\/span><span class=\"o\">(<\/span><span class=\"nc\">Bean<\/span> <span class=\"n\">that<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n\t\t<span class=\"k\">return<\/span> <span class=\"no\">COMPARATOR<\/span><span class=\"o\">.<\/span><span class=\"na\">compare<\/span><span class=\"o\">(<\/span><span class=\"k\">this<\/span><span class=\"o\">,<\/span> <span class=\"n\">that<\/span><span class=\"o\">);<\/span>\r\n\t<span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u4e0a\u6240\u8ff0\u751f\u6210\u7684 COMPARATOR \u662f\u4e0d\u53ef\u5e8f\u5217\u5316\u7684\u3002<\/p>\n<p>\u5982\u679c\u5c06\u5176\u8bbe\u4e3a public \u5e76\u4ece\u5916\u90e8\u4f7f\u7528\uff0c\u770b\u8d77\u6765\u4f3c\u4e4e\u6ca1\u6709\u95ee\u9898\uff0c\u4f46\u5982\u679c\u5c1d\u8bd5\u5e8f\u5217\u5316 COMPARATOR\uff0c\u4f1a\u53d1\u751f\u5f02\u5e38\u3002<\/p>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u8ba4\u4e3a\u5c06 COMPARATOR \u4fdd\u6301\u4e3a\u79c1\u6709\uff0c\u5e76\u4f7f\u7528Comparator#naturalOrder()\u6765\u5904\u7406\u662f\u66f4\u5b89\u5168\u7684\u3002<\/p>\n<p>\u5f53\u7136\uff0c\u5728\u9700\u8981\u5728\u73b0\u573a\u5b8c\u6210\u64cd\u4f5c\u7684\u60c5\u51b5\u4e0b\uff0c\u5982\u5bf9\u6570\u636e\u8fdb\u884c\u6392\u5e8f\u3001\u5927\u5c0f\u68c0\u67e5\u7b49\u60c5\u51b5\u4e0b\uff0c\u5373\u4f7f\u662f\u4e0d\u53ef\u5e8f\u5217\u5316\u7684lambda\u8868\u8fbe\u5f0f\u4e5f\u6ca1\u6709\u95ee\u9898\u3002<\/p>\n<h2>\u6ce8\u610f\u7ee7\u627f\u7e7c\u627f\u9020\u6210\u7684\u89aa\u5b50\u95dc\u4fc2\u6703\u4f7fequals()\u548c\u5927\u5c0f\u6bd4\u8f03\u8b8a\u5f97\u975e\u5e38\u8907\u96dc\uff08\u5c24\u5176\u662f\u5c0d\u7a31\u6027\u7684\u78ba\u4fdd\uff09\u3002<br \/>\n\u901a\u5e38\uff0c\u50c5\u9700\u5c07\u6578\u64da\u653e\u5165\u7684Bean\uff08\u5982DTO\u7b49\uff09\u901a\u5e38\u4e0d\u9700\u8981\u9032\u884c\u7e7c\u627f\u4e26\u6dfb\u52a0\u9805\u76ee\u3002<\/p>\n<p>\u5982\u679c\u8fd9\u6837\u7684\u8bdd\uff0c\u60a8\u53ef\u4ee5\u5c06\u5176\u5b9a\u4e49\u4e3a\u7ec8\u6781\u7c7b\uff0c\u5e76\u5c06\u7236\u7c7b\u8bbe\u4e3a java.lang.Object\uff0c\u4ece\u800c\u786e\u4fdd\u53ef\u4ee5\u53ef\u9760\u5730\u907f\u514d\u8fd9\u4e9b\u56f0\u96be\u95ee\u9898\u3002<\/p>\n<h1>\u5176\u4ed6Note: The Chinese translation provided is the direct equivalent of the Japanese word &#8220;sono ta&#8221; (\u305d\u306e\u4ed6), which means &#8220;other&#8221; or &#8220;remaining.&#8221;<\/p>\n<h2>\u5bf9\u6bd4\u7ed3\u679c\u7684\u89c2\u5bdf\u65b9\u5f0f deComparable\u548cComparator\u7684\u8fd4\u56de\u503c\u6709\u4e09\u79cd\u7c7b\u578b\uff1a\u6b63\u6570\u3001\u96f6\u3001\u8d1f\u6570\u3002<\/p>\n<p>\u8bb0\u5fc6\u65b9\u6cd5\u6709\u51e0\u79cd\uff0c\u4f46\u6211\u8ba4\u4e3a\u4ee5\u4e0b\u7684\u8bb0\u5fc6\u65b9\u5f0f\u6700\u7b80\u5355\u3002<\/p>\n<div>\n<div class=\"post-table\">\u7d50\u679c\u6bd4\u8f03\u610f\u5473\u6b63compare(a, b) &gt; 0a &gt; b\u975e\u8ca0compare(a, b) &gt;= 0a &gt;= b\u96f6compare(a, b) ==0a == b\u975e\u6b63compare(a, b) &lt;= 0a &lt;= b\u8ca0compare(a, b) &lt; 0a &lt; b<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30bc\u30ed\u3068\u6bd4\u8f03\u3059\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30bc\u30ed\u306f\u6bd4\u8f03\u6f14\u7b97\u5b50\u306e\u53f3\u5074\u306b\u7f6e\u304f<\/ul>\n<\/li>\n<\/ul>\n<p>compare() \u3068 0 \u306e\u9593\u306e\u6bd4\u8f03\u6f14\u7b97\u5b50\u306f\u3001a \u3068 b \u306e\u9593\u306b\u304a\u3044\u305f\u3082\u306e\u3068\u8003\u3048\u308b<\/p>\n<h2>\u50bb\u74dcComparator#comparingBoolean() \u304c\u306a\u3044\u306e\u304c\u3061\u3087\u3063\u3068\u9762\u5012\u3002\u30e9\u30e0\u30c0\u5f0f\u3067\u66f8\u3051\u3070\u3044\u3044\u306e\u3060\u3051\u3069\u3002<br \/>\nnull\u30bb\u30fc\u30d5\uff0b\u81ea\u7136\u9806\u5e8f\u3084\u3001null\u30bb\u30fc\u30d5\u540d\uff0bcomparing() \u306a\u3069\u983b\u767a\u3059\u308b\u3002\u6bce\u56de\u66f8\u304f\u306e\u306f\u7169\u96d1\u306a\u6c17\u304c\u3059\u308b<br \/>\n\u30e9\u30e0\u30c0\u306f\u5168\u90e8\u3001Serializeable \u306b\u3057\u3066\u304a\u3051\u3070\u826f\u3044\u306e\u306b\u2026\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e3a\u4e86\u4ec0\u4e48 \u5927\u5c0f\u6bd4\u8f03\u3092\u3059\u308b java.util.Comparator \u3068 java.lang.Comparabl [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[227],"class_list":["post-31287","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-227"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Java] \u53ef\u6bd4\u8f83\u5668 (Comparable) \u548c\u6bd4\u8f83\u5668 (Comparator) \u7684\u7b14\u8bb0. - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"\u5173\u4e8e[Java] \u53ef\u6bd4\u8f83\u5668 (Comparable) \u548c\u6bd4\u8f83\u5668 (Comparator) \u7684\u7b14\u8bb0.\u7684\u6280\u672f\u6587\u7ae0\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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