{"id":298941,"date":"2024-05-20T17:05:04","date_gmt":"2024-05-20T09:05:04","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/298941.html"},"modified":"2024-05-20T17:05:15","modified_gmt":"2024-05-20T09:05:15","slug":"java-%e5%a6%82%e4%bd%95%e5%b0%86%e4%ba%8c%e7%bb%b4%e6%95%b0%e7%bb%84%e8%bd%ac%e4%b8%ba%e5%ad%97%e7%ac%a6%e4%b8%b2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/298941.html","title":{"rendered":"java \u5982\u4f55\u5c06\u4e8c\u7ef4\u6570\u7ec4\u8f6c\u4e3a\u5b57\u7b26\u4e32"},"content":{"rendered":"

\"java<\/p>\n

\u5728Java\u4e2d\uff0c\u5c06\u4e8c\u7ef4\u6570\u7ec4\u8f6c\u4e3a\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u5229\u7528Arrays.deepToString()<\/code>\u65b9\u6cd5\u3001\u901a\u8fc7\u5faa\u73af\u904d\u5386\u6570\u7ec4\u3001\u4ee5\u53ca\u4f7f\u7528Java 8\u7684Stream API<\/strong>\u3002\u5728\u8fd9\u4e9b\u65b9\u6cd5\u4e2d\uff0c\u6700\u76f4\u63a5\u548c\u5e38\u7528\u7684\u662f\u5229\u7528Arrays.deepToString()<\/code>\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

Arrays.deepToString(Object[] a)<\/code>\u65b9\u6cd5\u63d0\u4f9b\u4e86\u4e00\u79cd\u975e\u5e38\u4fbf\u6377\u7684\u65b9\u5f0f\u6765\u5c06\u591a\u7ef4\u6570\u7ec4\u8f6c\u6362\u6210\u6613\u4e8e\u9605\u8bfb\u7684\u5b57\u7b26\u4e32\u683c\u5f0f\u3002\u8fd9\u4e2a\u65b9\u6cd5\u80fd\u591f\u9012\u5f52\u5730\u5904\u7406\u591a\u7ef4\u6570\u7ec4\uff0c\u4e0d\u8bba\u6570\u7ec4\u7684\u6df1\u5ea6\u5982\u4f55\uff0c\u90fd\u80fd\u5c06\u5176\u5185\u5bb9\u8f6c\u6362\u4e3a\u4e00\u4e2a\u683c\u5f0f\u5316\u7684\u5b57\u7b26\u4e32\u3002\u7531\u4e8e\u8fd9\u4e2a\u65b9\u6cd5\u662f\u4e3a\u5904\u7406\u201c\u6df1\u5c42\u201d\u7684\u6570\u7ec4\u7ed3\u6784\u800c\u8bbe\u8ba1\u7684\uff0c\u56e0\u6b64\u5bf9\u4e8e\u4e8c\u7ef4\u6570\u7ec4\u6765\u8bf4\u5c24\u5176\u5408\u9002\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u5229\u7528Arrays.deepToString()<\/code>\u65b9\u6cd5<\/h3>\n<\/p>\n

\u4f7f\u7528Arrays.deepToString()<\/code>\u5c06\u4e8c\u7ef4\u6570\u7ec4\u8f6c\u4e3a\u5b57\u7b26\u4e32\u975e\u5e38\u7b80\u5355\u3002\u9996\u5148\uff0c\u9700\u8981\u5bfc\u5165java.util.Arrays<\/code>\u5305\uff0c\u7136\u540e\u76f4\u63a5\u8c03\u7528\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u5e76\u5c06\u4e8c\u7ef4\u6570\u7ec4\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165\u3002<\/p>\n<\/p>\n

import java.util.Arrays;<\/p>\n
public class MAI<\/a>n {<\/p>\n
    public static void main(String[] args) {<\/p>\n
        int[][] myArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};<\/p>\n
        String arrayString = Arrays.deepToString(myArray);<\/p>\n
        System.out.println(arrayString);<\/p>\n
    }<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u5148\u58f0\u660e\u5e76\u521d\u59cb\u5316\u4e00\u4e2a\u4e8c\u7ef4\u6574\u578b\u6570\u7ec4myArray<\/code>\u3002\u968f\u540e\uff0c\u901a\u8fc7\u8c03\u7528Arrays.deepToString()<\/code>\u65b9\u6cd5\u5e76\u4f20\u5165myArray<\/code>\uff0c\u5c06\u8be5\u4e8c\u7ec8\u6570\u7ec4\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\u5e76\u8d4b\u503c\u7ed9arrayString<\/code>\u53d8\u91cf\u3002\u6700\u540e\uff0c\u8f93\u51fa\u8fd9\u4e2a\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u770b\u5230\u6570\u7ec4\u7684\u5185\u5bb9\u88ab\u683c\u5f0f\u5316\u4e3a\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u901a\u8fc7\u904d\u5386\u6570\u7ec4<\/h3>\n<\/p>\n
\u5c3d\u7ba1Arrays.deepToString()<\/code>\u975e\u5e38\u65b9\u4fbf\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u81ea\u5b9a\u4e49\u5b57\u7b26\u4e32\u7684\u683c\u5f0f\u3002\u8fd9\u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u904d\u5386\u4e8c\u7ef4\u6570\u7ec4\u7684\u65b9\u5f0f\u6765\u6784\u5efa\u5b57\u7b26\u4e32\u3002<\/p>\n<\/p>\n
public class Main {<\/p>\n
    public static void main(String[] args) {<\/p>\n
        int[][] myArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};<\/p>\n
        StringBuilder sb = new StringBuilder();<\/p>\n
        for (int i = 0; i < myArray.length; i++) {<\/p>\n
            sb.append("[");<\/p>\n
            for (int j = 0; j < myArray[i].length; j++) {<\/p>\n
                sb.append(myArray[i][j]);<\/p>\n
                if (j < myArray[i].length - 1) {<\/p>\n
                    sb.append(", ");<\/p>\n
                }<\/p>\n
            }<\/p>\n
            sb.append("]");<\/p>\n
            if (i < myArray.length - 1) {<\/p>\n
                sb.append(", ");<\/p>\n
            }<\/p>\n
        }<\/p>\n
        System.out.println(sb.toString());<\/p>\n
    }<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u4e2a\u65b9\u6cd5\u624b\u52a8\u6784\u5efa\u4e86\u4e00\u4e2aStringBuilder<\/code>\uff0c\u5e76\u9010\u4e2a\u8ffd\u52a0\u6570\u7ec4\u7684\u5143\u7d20\u3002\u8fd9\u79cd\u65b9\u5f0f\u7684\u597d\u5904\u5728\u4e8e\u53ef\u4ee5\u81ea\u5b9a\u4e49\u5206\u9694\u7b26\u548c\u683c\u5f0f\u5316\u65b9\u5f0f\uff0c\u66f4\u5177\u6709\u7075\u6d3b\u6027\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528Java 8\u7684Stream API<\/h3>\n<\/p>\n
Java 8\u5f15\u5165\u4e86Stream API\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u65b0\u7684\u65b9\u6cd5\u6765\u5904\u7406\u6570\u636e\u3002\u867d\u7136\u76f4\u63a5\u5904\u7406\u4e8c\u7ef4\u6570\u7ec4\u6709\u4e9b\u9ebb\u70e6\uff0c\u4f46\u6211\u4eec\u53ef\u4ee5\u5229\u7528Stream API\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
import java.util.Arrays;<\/p>\n
import java.util.stream.Collectors;<\/p>\n
public class Main {<\/p>\n
    public static void main(String[] args) {<\/p>\n
        int[][] myArray = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};<\/p>\n
        String arrayString = Arrays.stream(myArray)<\/p>\n
                                    .map(Arrays::toString)<\/p>\n
                                    .collect(Collectors.joining(", ", "[", "]"));<\/p>\n
        System.out.println(arrayString);<\/p>\n
    }<\/p>\n
}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u9996\u5148\u5c06\u4e8c\u7ef4\u6570\u7ec4\u8f6c\u6362\u6210\u6d41\uff0c\u7136\u540e\u5229\u7528map<\/code>\u65b9\u6cd5\u5c06\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff08\u5373\u4e00\u7ef4\u6570\u7ec4\uff09\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\u3002\u6700\u540e\uff0c\u5229\u7528collect<\/code>\u65b9\u6cd5\u5c06\u8fd9\u4e9b\u5b57\u7b26\u4e32\u8fde\u63a5\u8d77\u6765\uff0c\u901a\u8fc7Collectors.joining()<\/code>\u6307\u5b9a\u5143\u7d20\u4e4b\u95f4\u7684\u5206\u9694\u7b26\uff0c\u4ee5\u53ca\u6574\u4e2a\u5b57\u7b26\u4e32\u7684\u5f00\u59cb\u548c\u7ed3\u675f\u5b57\u7b26\u3002\u8fd9\u79cd\u65b9\u6cd5\u63d0\u4f9b\u4e86\u5bf9\u8f93\u51fa\u683c\u5f0f\u5316\u7684\u9ad8\u5ea6\u63a7\u5236\u3002<\/p>\n<\/p>\n
\u56db\u3001\u7ed3\u8bba<\/h3>\n<\/p>\n
Java\u4e2d\u5c06\u4e8c\u7ef4\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6839\u636e\u9700\u8981\u9009\u62e9\u4f7f\u7528\u6700\u76f4\u63a5\u7684Arrays.deepToString()<\/code>\uff0c\u6216\u8005\u4e3a\u4e86\u66f4\u591a\u7684\u683c\u5f0f\u5316\u63a7\u5236\u800c\u624b\u52a8\u904d\u5386\u6570\u7ec4\uff0c\u6216\u8005\u5229\u7528Java 8\u7684Stream API\u8fdb\u884c\u66f4\u52a0\u73b0\u4ee3\u5316\u548c\u6d41\u5f0f\u7684\u5904\u7406\u3002\u6bcf\u79cd\u65b9\u5f0f\u90fd\u6709\u5176\u9002\u7528\u60c5\u5883\uff0c\u638c\u63e1\u5b83\u4eec\u53ef\u4ee5\u5728\u4e0d\u540c\u7684\u7f16\u7a0b\u9700\u6c42\u4e2d\u7075\u6d3b\u5e94\u5bf9\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
\u5982\u4f55\u5229\u7528Java\u5c06\u4e8c\u7ef4\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff1f<\/strong><\/p>\n
    \n
  1. \u4f7f\u7528Arrays.deepToString()<\/code>\u65b9\u6cd5\uff1a\u53ef\u4ee5\u5c06\u4e8c\u7ef4\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff0c\u5176\u4e2ddeepToString()<\/code>\u65b9\u6cd5\u6765\u81ea\u4e8ejava.util.Arrays<\/code>\u7c7b\u3002<\/li>\n<\/ol>\n
    int[][] array = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};\nString arrayAsString = Arrays.deepToString(array);\nSystem.out.println(arrayAsString);\n<\/code><\/pre>\n
    \u8f93\u51fa\u7ed3\u679c\uff1a[[1, 2, 3], [4, 5, 6], [7, 8, 9]]<\/code><\/p>\n
      \n
    1. \u624b\u52a8\u904d\u5386\u4e8c\u7ef4\u6570\u7ec4\u5e76\u6784\u5efa\u5b57\u7b26\u4e32\uff1a\u4f60\u53ef\u4ee5\u624b\u52a8\u904d\u5386\u4e8c\u7ef4\u6570\u7ec4\u5e76\u6784\u5efa\u5b57\u7b26\u4e32\uff0c\u5c06\u6240\u9700\u5b57\u7b26\u6dfb\u52a0\u5230\u5b57\u7b26\u4e32\u4e2d\u3002<\/li>\n<\/ol>\n
      int[][] array = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};\nStringBuilder sb = new StringBuilder();\nfor (int[] row : array) {\n    sb.append("[");\n    for (int num : row) {\n        sb.append(num).append(", ");\n    }\n    sb.setLength(sb.length() - 2);  \/\/ \u5220\u9664\u6700\u540e\u7684 ", "\n    sb.append("], ");\n}\nsb.setLength(sb.length() - 2);  \/\/ \u5220\u9664\u6700\u540e\u7684 ", "\nString arrayAsString = sb.toString();\nSystem.out.println(arrayAsString);\n<\/code><\/pre>\n
      \u8f93\u51fa\u7ed3\u679c\uff1a[1, 2, 3], [4, 5, 6], [7, 8, 9]<\/code><\/p>\n
      \u5728Java\u4e2d\u5982\u4f55\u5c06\u4e8c\u7ef4\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u5e76\u4ee5\u7279\u5b9a\u5206\u9694\u7b26\u5206\u9694\u6bcf\u4e2a\u5143\u7d20\uff1f<\/strong><\/p>\n
        \n
      1. \u4f7f\u7528Arrays.deepToString()<\/code>\u65b9\u6cd5\u548c\u5b57\u7b26\u4e32\u66ff\u6362\uff1a\u53ef\u4ee5\u5c06\u9017\u53f7\u66ff\u6362\u4e3a\u6240\u9700\u7684\u7279\u5b9a\u5206\u9694\u7b26\u3002<\/li>\n<\/ol>\n
        int[][] array = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};\nString arrayAsString = Arrays.deepToString(array).replaceAll(", ", "\/");\nSystem.out.println(arrayAsString);\n<\/code><\/pre>\n
        \u8f93\u51fa\u7ed3\u679c\uff1a[[1, 2, 3]\/[4, 5, 6]\/[7, 8, 9]]<\/code><\/p>\n
          \n
        1. \u4f7f\u7528String.join()<\/code>\u65b9\u6cd5\uff1a\u53ef\u4ee5\u4f7f\u7528String.join()<\/code>\u65b9\u6cd5\u5c06\u6570\u7ec4\u5143\u7d20\u8fde\u63a5\u8d77\u6765\uff0c\u5e76\u4ee5\u7279\u5b9a\u5206\u9694\u7b26\u5206\u9694\u3002<\/li>\n<\/ol>\n
          int[][] array = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};\nStringBuilder sb = new StringBuilder();\nfor (int[] row : array) {\n    sb.append("[");\n    sb.append(String.join(", ", Arrays.stream(row).mapToObj(String::valueOf).toArray(String[]::new)));\n    sb.append("], ");\n}\nsb.setLength(sb.length() - 2);  \/\/ \u5220\u9664\u6700\u540e\u7684 ", "\nString arrayAsString = sb.toString();\nSystem.out.println(arrayAsString);\n<\/code><\/pre>\n
          \u8f93\u51fa\u7ed3\u679c\uff1a[1, 2, 3], [4, 5, 6], [7, 8, 9]<\/code><\/p>\n
          \u5982\u4f55\u904d\u5386\u5e76\u6253\u5370\u4e8c\u7ef4\u6570\u7ec4\u7684\u6240\u6709\u5143\u7d20\uff1f<\/strong><\/p>\n
            \n
          1. \u4f7f\u7528\u5d4c\u5957\u7684for<\/code>\u5faa\u73af\uff1a\u4f7f\u7528\u5d4c\u5957\u7684for<\/code>\u5faa\u73af\u53ef\u4ee5\u904d\u5386\u4e8c\u7ef4\u6570\u7ec4\u7684\u6240\u6709\u5143\u7d20\u3002<\/li>\n<\/ol>\n
            int[][] array = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};\nfor (int i = 0; i < array.length; i++) {\n    for (int j = 0; j < array[i].length; j++) {\n        System.out.println(array[i][j]);\n    }\n}\n<\/code><\/pre>\n
            \u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n
            1\n2\n3\n4\n5\n6\n7\n8\n9\n<\/code><\/pre>\n
              \n
            1. \u4f7f\u7528Arrays.stream()<\/code>\u65b9\u6cd5\u548cforEach()<\/code>\u65b9\u6cd5\uff1a\u53ef\u4ee5\u4f7f\u7528Arrays.stream()<\/code>\u65b9\u6cd5\u5c06\u4e8c\u7ef4\u6570\u7ec4\u8f6c\u6362\u4e3aStream<\/code>\u5bf9\u8c61\uff0c\u5e76\u4f7f\u7528forEach()<\/code>\u65b9\u6cd5\u6253\u5370\u6bcf\u4e2a\u5143\u7d20\u3002<\/li>\n<\/ol>\n
              int[][] array = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};\nArrays.stream(array).flatMapToInt(Arrays::stream).forEach(System.out::println);\n<\/code><\/pre>\n
              \u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n
              1\n2\n3\n4\n5\n6\n7\n8\n9\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"\u5728Java\u4e2d\uff0c\u5c06\u4e8c\u7ef4\u6570\u7ec4\u8f6c\u4e3a\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u5229\u7528Arrays.deepToString()\u65b9\u6cd5\u3001\u901a\u8fc7\u5faa […]","protected":false},"author":3,"featured_media":298953,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/298941"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=298941"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/298941\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/298953"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=298941"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=298941"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=298941"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}