{"id":239,"date":"2026-07-15T11:34:03","date_gmt":"2026-07-15T03:34:03","guid":{"rendered":"http:\/\/ssjava.xyz\/?p=239"},"modified":"2026-07-16T10:54:04","modified_gmt":"2026-07-16T02:54:04","slug":"07-%e6%95%b0%e7%bb%84%e8%bf%9b%e9%98%b6%ef%bc%9a%e5%a4%9a%e7%bb%b4%e6%95%b0%e7%bb%84%e3%80%81%e6%95%b0%e7%bb%84%e5%b7%a5%e5%85%b7%e7%b1%bb%e4%b8%8e%e5%8f%af%e5%8f%98%e5%8f%82%e6%95%b0","status":"publish","type":"post","link":"https:\/\/ssjava.xyz\/index.php\/2026\/07\/15\/07-%e6%95%b0%e7%bb%84%e8%bf%9b%e9%98%b6%ef%bc%9a%e5%a4%9a%e7%bb%b4%e6%95%b0%e7%bb%84%e3%80%81%e6%95%b0%e7%bb%84%e5%b7%a5%e5%85%b7%e7%b1%bb%e4%b8%8e%e5%8f%af%e5%8f%98%e5%8f%82%e6%95%b0\/","title":{"rendered":"07. \u6570\u7ec4\u8fdb\u9636\uff1a\u591a\u7ef4\u6570\u7ec4\u3001\u6570\u7ec4\u5de5\u5177\u7c7b\u4e0e\u53ef\u53d8\u53c2\u6570"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u5f00\u7bc7\u5f15\u5b50<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u7bc7\u6587\u7ae0\u6211\u4eec\u5b66\u4e86\u6570\u7ec4\u7684&#8221;\u57fa\u672c\u64cd\u4f5c&#8221;\u2014\u2014\u904d\u5386\u3001\u6c42\u548c\u3001\u627e\u6700\u503c\u3002\u4f46\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u4f60\u9047\u5230\u7684\u573a\u666f\u8fdc\u6bd4&#8221;\u5b58 5 \u4e2a\u5b66\u751f\u6210\u7ee9&#8221;\u590d\u6742\u3002\u6bd4\u5982\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b58\u4e00\u4e2a 3\u00d73 \u7684\u68cb\u76d8\uff08\u4e94\u5b50\u68cb\u3001\u4e95\u5b57\u68cb\uff09\u7528\u5565\uff1f\u2192 \u4e8c\u7ef4\u6570\u7ec4<\/li>\n\n\n\n<li>\u60f3\u628a\u6570\u7ec4\u5feb\u901f\u6392\u5e8f\u3001\u586b\u5145\u3001\u6bd4\u8f83\u600e\u4e48\u641e\uff1f\u2192 Arrays \u5de5\u5177\u7c7b<\/li>\n\n\n\n<li>\u65b9\u6cd5\u4e0d\u786e\u5b9a\u8981\u4f20\u591a\u5c11\u4e2a\u53c2\u6570\u600e\u4e48\u529e\uff1f\u2192 \u53ef\u53d8\u53c2\u6570<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u7bc7\u5c31\u628a\u8fd9\u4e09\u4e2a\u95ee\u9898\u4e00\u7f51\u6253\u5c3d\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u591a\u7ef4\u6570\u7ec4<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">1.1 \u4e8c\u7ef4\u6570\u7ec4\u7684\u5b9a\u4e49<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e8c\u7ef4\u6570\u7ec4\u672c\u8d28\u4e0a\u662f&#8221;\u6570\u7ec4\u7684\u6570\u7ec4&#8221;\u2014\u2014\u6bcf\u4e2a\u5143\u7d20\u53c8\u662f\u4e00\u4e2a\u4e00\u7ef4\u6570\u7ec4\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u65b9\u5f0f\u4e00\uff1a\u89c4\u5219\u77e9\u5f62\uff083\u884c4\u5217\uff09\nint&#91;]&#91;] matrix = new int&#91;3]&#91;4];\n\n\/\/ \u65b9\u5f0f\u4e8c\uff1a\u76f4\u63a5\u8d4b\u503c\nint&#91;]&#91;] matrix2 = {\n    {1, 2, 3, 4},\n    {5, 6, 7, 8},\n    {9, 10, 11, 12}\n};\n\n\/\/ \u65b9\u5f0f\u4e09\uff1a\u5148\u58f0\u660e\u884c\u6570\uff0c\u518d\u5206\u522b new \u6bcf\u4e00\u884c\nint&#91;]&#91;] matrix3 = new int&#91;3]&#91;];\nmatrix3&#91;0] = new int&#91;4];\nmatrix3&#91;1] = new int&#91;4];\nmatrix3&#91;2] = new int&#91;4];<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u83b7\u53d6\u4e8c\u7ef4\u6570\u7ec4\u7684\u884c\u6570\u548c\u5217\u6570\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;]&#91;] arr = {{1,2,3},{4,5,6}};\nSystem.out.println(\"\u884c\u6570\uff1a\" + arr.length);      \/\/ 2\nSystem.out.println(\"\u5217\u6570\uff1a\" + arr&#91;0].length);   \/\/ 3<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">1.2 \u4e8c\u7ef4\u6570\u7ec4\u7684\u904d\u5386<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;]&#91;] scores = {\n    {85, 90, 78},  \/\/ \u5b66\u751f0\u7684\u4e09\u95e8\u6210\u7ee9\n    {92, 88, 95},  \/\/ \u5b66\u751f1\u7684\u4e09\u95e8\u6210\u7ee9\n    {76, 82, 79},  \/\/ \u5b66\u751f2\u7684\u4e09\u95e8\u6210\u7ee9\n    {88, 85, 91}   \/\/ \u5b66\u751f3\u7684\u4e09\u95e8\u6210\u7ee9\n};\n\n\/\/ \u53cc\u5c42 for \u5faa\u73af\u904d\u5386\nfor (int i = 0; i &lt; scores.length; i++) {\n    System.out.print(\"\u5b66\u751f\" + i + \"\uff1a\");\n    for (int j = 0; j &lt; scores&#91;i].length; j++) {\n        System.out.print(scores&#91;i]&#91;j] + \" \");\n    }\n    System.out.println();  \/\/ \u6362\u884c\n}\n\n\/\/ \u589e\u5f3a for \u4e5f\u53ef\u4ee5\nfor (int&#91;] student : scores) {\n    for (int score : student) {\n        System.out.print(score + \" \");\n    }\n    System.out.println();\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8fd0\u884c\u7ed3\u679c\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\u5b66\u751f0\uff1a85 90 78\n\u5b66\u751f1\uff1a92 88 95\n\u5b66\u751f2\uff1a76 82 79\n\u5b66\u751f3\uff1a88 85 91<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">1.3 \u4e0d\u89c4\u5219\u4e8c\u7ef4\u6570\u7ec4\uff08\u952f\u9f7f\u6570\u7ec4\uff09<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u65e2\u7136\u4e8c\u7ef4\u6570\u7ec4\u662f&#8221;\u6570\u7ec4\u7684\u6570\u7ec4&#8221;\uff0c\u90a3\u6bcf\u4e00\u884c\u7684\u957f\u5ea6\u53ef\u4ee5\u4e0d\u540c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u6768\u8f89\u4e09\u89d2\uff1a\u7b2c n \u884c\u6709 n+1 \u4e2a\u5143\u7d20\nint&#91;]&#91;] yangHui = new int&#91;5]&#91;];\nfor (int i = 0; i &lt; yangHui.length; i++) {\n    yangHui&#91;i] = new int&#91;i + 1];  \/\/ \u6bcf\u884c\u957f\u5ea6\u9012\u589e\n    yangHui&#91;i]&#91;0] = 1;\n    yangHui&#91;i]&#91;i] = 1;\n    for (int j = 1; j &lt; i; j++) {\n        yangHui&#91;i]&#91;j] = yangHui&#91;i - 1]&#91;j - 1] + yangHui&#91;i - 1]&#91;j];\n    }\n}\n\n\/\/ \u6253\u5370\nfor (int&#91;] row : yangHui) {\n    System.out.println(Arrays.toString(row));\n}\n\/\/ \u8f93\u51fa\uff1a\n\/\/ &#91;1]\n\/\/ &#91;1, 1]\n\/\/ &#91;1, 2, 1]\n\/\/ &#91;1, 3, 3, 1]\n\/\/ &#91;1, 4, 6, 4, 1]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u79cd\u4e0d\u89c4\u5219\u6570\u7ec4\u4e5f\u53eb<strong>\u952f\u9f7f\u6570\u7ec4<\/strong>\u3002\u6bd4\u5982\u8981\u5b58\u50a8\u6bcf\u4e2a\u5b66\u751f\u9009\u4fee\u7684\u8bfe\u7a0b\u2014\u2014A \u5b66\u751f\u9009\u4e863\u95e8\uff0cB \u5b66\u751f\u9009\u4e865\u95e8\u2014\u2014\u952f\u9f7f\u6570\u7ec4\u5929\u7136\u9002\u5408\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">1.4 \u4e09\u7ef4\u53ca\u4ee5\u4e0a\u6570\u7ec4<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u7406\u8bba\u4e0a Java \u652f\u6301\u4efb\u610f\u7ef4\u5ea6\u7684\u6570\u7ec4\uff0c\u4f46\u5b9e\u9645\u4e2d\u8d85\u8fc7\u4e09\u7ef4\u5c31\u5f88\u5c11\u89c1\u4e86\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u4e09\u7ef4\u6570\u7ec4\uff1aint&#91;\u5c42]&#91;\u884c]&#91;\u5217]\nint&#91;]&#91;]&#91;] cube = new int&#91;3]&#91;4]&#91;5];  \/\/ 3\u5c42\u3001\u6bcf\u5c424\u884c\u3001\u6bcf\u884c5\u5217\n\n\/\/ \u8d4b\u503c\ncube&#91;0]&#91;0]&#91;0] = 100;\ncube&#91;2]&#91;3]&#91;4] = 200;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u7406\u89e3\u4e3a\u4e00\u4e2a\u7acb\u65b9\u4f53\u7684 x\/y\/z \u5750\u6807\u3002\u4f46\u8bb2\u771f\uff0c\u5de5\u4f5c\u4e2d\u7528\u5230\u4e09\u7ef4\u6570\u7ec4\u7684\u6982\u7387\u6781\u4f4e\uff0c\u77e5\u9053\u6709\u8fd9\u4e48\u56de\u4e8b\u5c31\u884c\uff0c\u522b\u5728\u8fd9\u4e0a\u9762\u94bb\u725b\u89d2\u5c16\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001Arrays \u5de5\u5177\u7c7b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><code>java.util.Arrays<\/code> \u662f Java \u7ed9\u6570\u7ec4\u91cf\u8eab\u5b9a\u505a\u7684\u5de5\u5177\u7c7b\uff0c<strong>\u6240\u6709\u65b9\u6cd5\u90fd\u662f\u9759\u6001\u7684<\/strong>\uff0c\u76f4\u63a5 <code>Arrays.xxx()<\/code> \u5c31\u80fd\u8c03\u7528\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2.1 toString()\u2014\u2014\u5feb\u901f\u6253\u5370<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u4e00\u7bc7\u5df2\u7ecf\u7528\u4e86\uff0c\u8fd9\u91cc\u518d\u63d0\u4e00\u4e0b\u4e8c\u7ef4\u6570\u7ec4\u7684\u6253\u5370\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;]&#91;] arr = {{1,2,3},{4,5,6}};\nSystem.out.println(Arrays.toString(arr));\n\/\/ \u8f93\u51fa\uff1a&#91;&#91;I@...], &#91;I@...]]  \u2190 \u53c8\u53d8\u6210\u5730\u5740\u4e86\uff01\n\/\/ \u8981\u7528\u8fd9\u4e2a\uff1a\nSystem.out.println(Arrays.deepToString(arr));\n\/\/ \u8f93\u51fa\uff1a&#91;&#91;1, 2, 3], &#91;4, 5, 6]]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bb0\u4f4f\uff1a<strong>\u4e00\u7ef4\u7528 <code>toString()<\/code>\uff0c\u591a\u7ef4\u7528 <code>deepToString()<\/code><\/strong>\u3002\u4e0d\u8981\u95ee\u6211\u4e3a\u4ec0\u4e48\u77e5\u9053\uff0c\u95ee\u5c31\u662f\u88ab\u5751\u8fc7\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2.2 sort()\u2014\u2014\u6392\u5e8f<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] arr = {5, 3, 9, 1, 7};\nArrays.sort(arr);\nSystem.out.println(Arrays.toString(arr));  \/\/ &#91;1, 3, 5, 7, 9]\n\n\/\/ \u652f\u6301\u6307\u5b9a\u8303\u56f4\uff1a\u5bf9 &#91;1, 4) \u6392\u5e8f\nint&#91;] arr2 = {5, 3, 9, 1, 7};\nArrays.sort(arr2, 1, 4);\nSystem.out.println(Arrays.toString(arr2));  \/\/ &#91;5, 1, 3, 9, 7]<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><code>Arrays.sort()<\/code> \u5e95\u5c42\u7528\u7684\u662f<strong>\u53cc\u8f74\u5feb\u6392<\/strong>\uff08Dual-Pivot Quicksort\uff09\uff0c\u5bf9\u4e8e\u57fa\u672c\u7c7b\u578b\u6027\u80fd\u5f88\u597d\u3002\u8bb0\u4f4f\u7528\u6cd5\u5c31\u884c\uff0c\u9762\u8bd5\u95ee\u5e95\u5c42\u5b9e\u73b0\u7684\u65f6\u5019\u518d\u8bf4\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2.3 binarySearch()\u2014\u2014\u4e8c\u5206\u67e5\u627e<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4f7f\u7528\u524d\u63d0\uff1a\u6570\u7ec4\u5fc5\u987b\u5df2\u7ecf\u6392\u597d\u5e8f<\/strong>\u3002\u4e0d\u7136\u7ed3\u679c\u4e71\u5957\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] arr = {1, 3, 5, 7, 9};\nint index = Arrays.binarySearch(arr, 5);\nSystem.out.println(\"5 \u7684\u4f4d\u7f6e\uff1a\" + index);  \/\/ 2\n\n\/\/ \u627e\u4e0d\u5230\u7684\u60c5\u51b5\nint index2 = Arrays.binarySearch(arr, 4);\nSystem.out.println(index2);              \/\/ -3\uff08\u63d2\u5165\u70b9\uff1a-2-1=-3\uff0c\u8868\u793a\u5e94\u8be5\u63d2\u5728\u4f4d\u7f6e2\uff09<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e8c\u5206\u67e5\u627e\u7684\u6548\u7387\u662f <strong>O(log n)<\/strong>\uff0c\u6bd4\u7ebf\u6027\u67e5\u627e\u7684 O(n) \u5feb\u5f88\u591a\u3002\u6bd4\u5982\u5728 100 \u4e07\u4e2a\u6709\u5e8f\u6570\u91cc\u627e\u4e00\u4e2a\u503c\uff0c\u6700\u574f\u60c5\u51b5\u4e0b\u7ebf\u6027\u67e5\u627e\u8981 100 \u4e07\u6b21\uff0c\u4e8c\u5206\u67e5\u627e\u6700\u591a 20 \u6b21\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2.4 fill()\u2014\u2014\u586b\u5145<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] arr = new int&#91;5];\nArrays.fill(arr, 100);\nSystem.out.println(Arrays.toString(arr));  \/\/ &#91;100, 100, 100, 100, 100]\n\n\/\/ \u6307\u5b9a\u8303\u56f4\u586b\u5145\nArrays.fill(arr, 1, 4, 50);\nSystem.out.println(Arrays.toString(arr));  \/\/ &#91;100, 50, 50, 50, 100]<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">2.5 equals() \u2014\u2014 \u6bd4\u8f83\u6570\u7ec4\u662f\u5426\u76f8\u7b49<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] a = {1, 2, 3};\nint&#91;] b = {1, 2, 3};\nint&#91;] c = {1, 2, 4};\n\nSystem.out.println(a == b);                \/\/ false \u2014\u2014 \u6bd4\u8f83\u7684\u662f\u5730\u5740\uff01\nSystem.out.println(Arrays.equals(a, b));   \/\/ true  \u2014\u2014 \u6bd4\u8f83\u7684\u662f\u5185\u5bb9\nSystem.out.println(Arrays.equals(a, c));   \/\/ false<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u518d\u6b21\u5f3a\u8c03\uff1a<code>==<\/code> \u6bd4\u8f83\u5f15\u7528\u7c7b\u578b\u7684\u5730\u5740\uff0c<code>Arrays.equals()<\/code> \u624d\u6bd4\u8f83\u5185\u5bb9\u3002\u591a\u7ef4\u6570\u7ec4\u7528 <code>Arrays.deepEquals()<\/code>\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">2.6 copyOf() \/ copyOfRange() \u2014\u2014 \u62f7\u8d1d<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u4e00\u7bc7\u5df2\u7ecf\u4ecb\u7ecd\u8fc7\u4e86\uff0c\u8fd9\u91cc\u53ea\u662f\u4e00\u4e2a\u6c47\u603b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int&#91;] original = {1, 2, 3, 4, 5};\n\n\/\/ \u5b8c\u6574\u62f7\u8d1d\nint&#91;] copy = Arrays.copyOf(original, original.length);\n\n\/\/ \u6269\u5c55\uff08\u591a\u51fa\u7684\u8865\u9ed8\u8ba4\u503c\uff09\nint&#91;] expanded = Arrays.copyOf(original, 7);  \/\/ &#91;1, 2, 3, 4, 5, 0, 0]\n\n\/\/ \u622a\u53d6\nint&#91;] part = Arrays.copyOfRange(original, 1, 4);  \/\/ &#91;2, 3, 4]<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001\u53ef\u53d8\u53c2\u6570\uff08Varargs\uff09<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">3.1 \u4e3a\u4ec0\u4e48\u9700\u8981\u53ef\u53d8\u53c2\u6570\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u60f3\u8c61\u4f60\u8981\u5199\u4e00\u4e2a\u6c42\u4efb\u610f\u591a\u4e2a\u6574\u6570\u4e4b\u548c\u7684\u65b9\u6cd5\u3002\u6ca1\u6709\u53ef\u53d8\u53c2\u6570\u7684\u8bdd\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u8981\u4e48\u5199\u591a\u4e2a\u91cd\u8f7d\nint sum2(int a, int b) { ... }\nint sum3(int a, int b, int c) { ... }\nint sum4(int a, int b, int c, int d) { ... }\n\/\/ \u5199\u5230 sum100 \u5417\uff1f\ud83d\ude02\n\n\/\/ \u8981\u4e48\u4f20\u4e00\u4e2a\u6570\u7ec4\nint sum(int&#91;] arr) { ... }\n\/\/ \u8c03\u7528\uff1asum(new int&#91;]{1, 2, 3, 4, 5});  \u2014\u2014 \u633a\u5570\u55e6\u7684<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u53d8\u53c2\u6570\u5c31\u662f\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u2014\u2014<strong>\u8ba9\u8c03\u7528\u65b9\u53ef\u4ee5\u50cf\u4f20\u96f6\u6563\u53c2\u6570\u4e00\u6837\uff0c\u65b9\u6cd5\u5185\u90e8\u81ea\u52a8\u628a\u5b83\u4eec\u7ec4\u88c5\u6210\u6570\u7ec4<\/strong>\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3.2 \u57fa\u672c\u7528\u6cd5<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>public class VarargsDemo {\n    public static void main(String&#91;] args) {\n        System.out.println(sum(1, 2));              \/\/ 3\n        System.out.println(sum(1, 2, 3, 4, 5));     \/\/ 15\n        System.out.println(sum());                  \/\/ 0 \uff08\u4f20 0 \u4e2a\u4e5f\u884c\uff09\n    }\n    \n    \/\/ \u53ef\u53d8\u53c2\u6570\u7528 \u7c7b\u578b... \u8868\u793a\n    public static int sum(int... numbers) {\n        int total = 0;\n        for (int num : numbers) {\n            total += num;\n        }\n        return total;\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8bed\u6cd5\u89c4\u5219\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>\u7c7b\u578b... \u53c2\u6570\u540d<\/code> \u8868\u793a\u53ef\u53d8\u53c2\u6570\uff0c\u672c\u8d28\u4e0a\u5c31\u662f\u6570\u7ec4<\/li>\n\n\n\n<li>\u4e00\u4e2a\u65b9\u6cd5<strong>\u6700\u591a\u53ea\u80fd\u6709\u4e00\u4e2a<\/strong>\u53ef\u53d8\u53c2\u6570<\/li>\n\n\n\n<li>\u53ef\u53d8\u53c2\u6570<strong>\u5fc5\u987b\u653e\u5728\u53c2\u6570\u5217\u8868\u7684\u6700\u540e<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u2705 \u6b63\u786e\uff1a\u53ef\u53d8\u53c2\u6570\u5728\u6700\u540e\nvoid print(String prefix, int... numbers) {\n    System.out.print(prefix + \": \");\n    for (int n : numbers) System.out.print(n + \" \");\n}\n\n\/\/ \u274c \u9519\u8bef\uff1a\u53ef\u53d8\u53c2\u6570\u4e0d\u5728\u6700\u540e\nvoid wrong(int... numbers, String prefix) { }\n\n\/\/ \u274c \u9519\u8bef\uff1a\u591a\u4e2a\u53ef\u53d8\u53c2\u6570\uff08\u4e0d\u662f\u8bed\u6cd5\u9650\u5236\uff0c\u800c\u662f\u4e8c\u4e49\u6027\uff09\nvoid multiple(int... a, String... b) { }<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">3.3 \u53ef\u53d8\u53c2\u6570\u7684\u8c03\u7528\u65b9\u5f0f<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u65b9\u5f0f\u4e00\uff1a\u76f4\u63a5\u4f20\u591a\u4e2a\u503c\nsum(1, 2, 3);\n\n\/\/ \u65b9\u5f0f\u4e8c\uff1a\u4f20\u6570\u7ec4\uff08\u53ef\u53d8\u53c2\u6570\u517c\u5bb9\u6570\u7ec4\u4f20\u53c2\uff09\nsum(new int&#91;]{1, 2, 3});\n\n\/\/ \u65b9\u5f0f\u4e09\uff1a\u4f20 0 \u4e2a\u53c2\u6570\nsum();<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\u4e00\u4e2a\u7ec6\u8282\uff1a\u8c03\u7528\u65f6\u65e2\u80fd\u4f20\u96f6\u6563\u53c2\u6570\u4e5f\u80fd\u4f20\u6570\u7ec4\uff0c\u4f46<strong>\u4e0d\u80fd\u4f20 null<\/strong>\u2014\u2014\u7f16\u8bd1\u5668\u4f1a\u628a\u5b83\u5f53\u6210\u4e00\u4e2a null \u6570\u7ec4\u5bf9\u8c61\uff0c\u8fd0\u884c\u65f6\u904d\u5386\u4f1a\u629b NullPointerException\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3.4 \u5b9e\u9645\u573a\u666f\uff1a\u683c\u5f0f\u5316\u5b57\u7b26\u4e32<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u65e5\u5e38\u7528\u5f97\u6700\u591a\u7684\u53ef\u53d8\u53c2\u6570\u5c31\u662f <code>String.format()<\/code> \u548c <code>printf()<\/code>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String msg = String.format(\"\u59d3\u540d\uff1a%s\uff0c\u5e74\u9f84\uff1a%d\uff0c\u6210\u7ee9\uff1a%.1f\", \"\u5f20\u4e09\", 20, 88.5);\nSystem.out.println(msg);\n\/\/ \u8f93\u51fa\uff1a\u59d3\u540d\uff1a\u5f20\u4e09\uff0c\u5e74\u9f84\uff1a20\uff0c\u6210\u7ee9\uff1a88.5<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>printf<\/code> \u7684\u7b2c\u4e00\u4e2a\u53c2\u6570\u662f\u683c\u5f0f\u5b57\u7b26\u4e32\uff0c\u540e\u9762\u7684\u53c2\u6570\u6570\u91cf\u968f\u610f\u2014\u2014\u8fd9\u5c31\u662f\u5178\u578b\u53ef\u53d8\u53c2\u6570\u5e94\u7528\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u7efc\u5408\u7ec3\u4e60\uff1a\u5b66\u751f\u6210\u7ee9\u7edf\u8ba1\u7cfb\u7edf<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u628a\u6570\u7ec4\u8fdb\u9636\u77e5\u8bc6\u4e32\u8d77\u6765\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import java.util.Arrays;\n\npublic class ScoreSystem {\n    public static void main(String&#91;] args) {\n        \/\/ \u4e8c\u7ef4\u6570\u7ec4\uff1a3\u4e2a\u5b66\u751f\uff0c\u6bcf\u4eba4\u95e8\u8bfe\n        int&#91;]&#91;] scores = {\n            {85, 90, 78, 92},  \/\/ \u5f20\u4e09\n            {70, 65, 88, 72},  \/\/ \u674e\u56db\n            {95, 91, 89, 96}   \/\/ \u738b\u4e94\n        };\n        String&#91;] names = {\"\u5f20\u4e09\", \"\u674e\u56db\", \"\u738b\u4e94\"};\n        \n        System.out.println(\"===== \u6210\u7ee9\u7edf\u8ba1\u7cfb\u7edf =====\");\n        \n        \/\/ 1. \u6253\u5370\u6210\u7ee9\u8868\n        System.out.println(\"\u59d3\u540dtJavatPythont\u6570\u636e\u5e93t\u7b97\u6cd5\");\n        for (int i = 0; i &lt; names.length; i++) {\n            System.out.print(names&#91;i] + \"t\");\n            for (int j = 0; j &lt; scores&#91;i].length; j++) {\n                System.out.print(scores&#91;i]&#91;j] + \"t\");\n            }\n            System.out.println();\n        }\n        \n        \/\/ 2. \u6bcf\u4e2a\u4eba\u7684\u5e73\u5747\u5206\uff08\u7528\u53ef\u53d8\u53c2\u6570\u65b9\u6cd5\uff09\n        for (int i = 0; i &lt; names.length; i++) {\n            double avg = avg(scores&#91;i]&#91;0], scores&#91;i]&#91;1], scores&#91;i]&#91;2], scores&#91;i]&#91;3]);\n            System.out.println(names&#91;i] + \" \u5e73\u5747\u5206\uff1a\" + avg);\n        }\n        \n        \/\/ 3. \u6bcf\u95e8\u8bfe\u7684\u6700\u9ad8\u5206\n        for (int j = 0; j &lt; 4; j++) {\n            int&#91;] courseScores = new int&#91;3];\n            for (int i = 0; i &lt; 3; i++) {\n                courseScores&#91;i] = scores&#91;i]&#91;j];\n            }\n            Arrays.sort(courseScores);\n            System.out.println(\"\u7b2c\" + (j + 1) + \"\u95e8\u8bfe\u6700\u9ad8\u5206\uff1a\" + courseScores&#91;2]);\n        }\n        \n        \/\/ 4. \u627e\u51fa\u5168\u79d1\u4f18\u79c0\uff08\u5e73\u5747\u5206\u226585\uff09\u7684\u5b66\u751f\n        System.out.print(\"\u5168\u79d1\u4f18\u79c0\u5b66\u751f\uff1a\");\n        for (int i = 0; i &lt; names.length; i++) {\n            double avg = avg(scores&#91;i]&#91;0], scores&#91;i]&#91;1], scores&#91;i]&#91;2], scores&#91;i]&#91;3]);\n            if (avg &gt;= 85) {\n                System.out.print(names&#91;i] + \" \");\n            }\n        }\n        System.out.println();\n    }\n    \n    \/\/ \u53ef\u53d8\u53c2\u6570\u65b9\u6cd5\uff1a\u6c42\u4efb\u610f\u591a\u4e2a\u6570\u7684\u5e73\u5747\u503c\n    public static double avg(int... numbers) {\n        int sum = 0;\n        for (int n : numbers) {\n            sum += n;\n        }\n        return (double) sum \/ numbers.length;\n    }\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8fd0\u884c\u7ed3\u679c\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>===== \u6210\u7ee9\u7edf\u8ba1\u7cfb\u7edf =====\n\u59d3\u540d\tJava\tPython\t\u6570\u636e\u5e93\t\u7b97\u6cd5\n\u5f20\u4e09\t85\t90\t78\t92\n\u674e\u56db\t70\t65\t88\t72\n\u738b\u4e94\t95\t91\t89\t96\n\u5f20\u4e09 \u5e73\u5747\u5206\uff1a86.25\n\u674e\u56db \u5e73\u5747\u5206\uff1a73.75\n\u738b\u4e94 \u5e73\u5747\u5206\uff1a92.75\n\u7b2c1\u95e8\u8bfe\u6700\u9ad8\u5206\uff1a95\n\u7b2c2\u95e8\u8bfe\u6700\u9ad8\u5206\uff1a91\n\u7b2c3\u95e8\u8bfe\u6700\u9ad8\u5206\uff1a89\n\u7b2c4\u95e8\u8bfe\u6700\u9ad8\u5206\uff1a96\n\u5168\u79d1\u4f18\u79c0\u5b66\u751f\uff1a\u5f20\u4e09 \u738b\u4e94<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u603b\u7ed3<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u591a\u7ef4\u6570\u7ec4<\/strong>\u662f&#8221;\u6570\u7ec4\u7684\u6570\u7ec4&#8221;\uff0c\u5e38\u7528\u7684\u662f\u4e8c\u7ef4\u6570\u7ec4\uff0c\u652f\u6301\u4e0d\u89c4\u5219\u952f\u9f7f<\/li>\n\n\n\n<li><strong>Arrays \u5de5\u5177\u7c7b<\/strong>\u63d0\u4f9b\u6392\u5e8f\u3001\u67e5\u627e\u3001\u586b\u5145\u3001\u6bd4\u8f83\u3001\u62f7\u8d1d\u7b49\u5b9e\u7528\u65b9\u6cd5\uff0c\u5f00\u53d1\u4e2d\u76f4\u63a5\u7528<\/li>\n\n\n\n<li><strong>\u4e00\u7ef4\u7528 <code>toString()<\/code>\uff0c\u591a\u7ef4\u7528 <code>deepToString()<\/code><\/strong>\uff0c\u8fd9\u662f\u6700\u5e38\u89c1\u7684\u5751<\/li>\n\n\n\n<li><strong>\u53ef\u53d8\u53c2\u6570<\/strong>\u7528 <code>\u7c7b\u578b... \u53c2\u6570\u540d<\/code> \u58f0\u660e\uff0c\u672c\u8d28\u662f\u6570\u7ec4\u8bed\u6cd5\u7cd6\uff0c\u8c03\u7528\u65f6\u4f20\u96f6\u6563\u53c2\u6570\u6216\u6570\u7ec4\u90fd\u884c<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0b\u4e00\u7bc7\u6211\u4eec\u7ec8\u4e8e\u8981\u8fdb\u5165<strong>\u65b9\u6cd5<\/strong>\u7684\u6df1\u5165\u8bb2\u89e3\u4e86\u2014\u2014\u65b9\u6cd5\u5b9a\u4e49\u3001\u91cd\u8f7d\u3001\u9012\u5f52\u3001\u503c\u4f20\u9012\uff0c\u8fd9\u4e9b\u662f Java \u7f16\u7a0b\u7684\u6838\u5fc3\u601d\u7ef4\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f00\u7bc7\u5f15\u5b50 \u4e0a\u7bc7\u6587\u7ae0\u6211\u4eec\u5b66\u4e86\u6570\u7ec4\u7684&#8221;\u57fa\u672c\u64cd\u4f5c&#8221;\u2014\u2014\u904d\u5386\u3001\u6c42\u548c\u3001\u627e\u6700\u503c\u3002\u4f46\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u4f60\u9047 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[44],"tags":[],"class_list":["post-239","post","type-post","status-publish","format-standard","hentry","category-array-method"],"_links":{"self":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts\/239","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=239"}],"version-history":[{"count":2,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts\/239\/revisions"}],"predecessor-version":[{"id":247,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/posts\/239\/revisions\/247"}],"wp:attachment":[{"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=239"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=239"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ssjava.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}