Java多维数组和Arrays类方法总结详解

public class WhatEver {
  public static void main(String[] args) {
    //第一种  例:
    String[] test1 = new String[6];
    test1[0] = "数组0";
    test1[1] = "数组1";
 
 
    //第二种 例:
    String[] test2 = {"数组0","数组1","数组2","...."};
 
    //第三种 例:
    String[] test3 = new String[]{"数组0","数组1","数组2","...."};
  }
}<br><br>

/二维数组
public class Test1 {
  public static void main(String[] args) {
    int[] score1=new int[10];
    int[][] score2;
    String[][] names;
    //二维数组的初始化
    score2=new int[][]{{1,2,3},{3,4,5,6},{16,7}};//静态初始化
    names=new String[6][5];//动态初始化方式一
    names=new String[6][];//动态初始化方式二，一定要设置行数
    names[0]=new String[5];//第一行中有5个元素
    names[1]=new String[4];
    names[2]=new String[7];
    names[3]=new String[5];
    names[4]=new String[8];
    names[5]=new String[5];
    System.out.println("第一行中的元素："+names[1].length);
    System.out.println(names.length);//打印的是二维数组有几行
 
    //如何遍历二维数组
    for(int m=0;m<score2.length;m++){//控制行数
      for(int n=0;n<score2[m].length;n++){//一行中有多少个元素（即多少列）
        System.out.print(score2[m][n]+" ");
      }
      System.out.println();
    }
  }
}

 @SafeVarargs
 public static <T> List<T> asList(T... a) {
 return new ArrayList<>(a);
 }

 List<String> stringList = Arrays.asList("Welcome", "To", "Java",
 "World!");
 List<Integer> intList = Arrays.asList(1, 2, 3, 4);

 String[] names2 = { "Eric", "John", "Alan", "Liz" };
   //[Eric, John, Alan]
  String[] copy = Arrays.copyOf(names2, 3);
  
  //[Alan, Liz]
   String[] rangeCopy = Arrays.copyOfRange(names2, 2,
     names2.length);

 String[] names = { "Liz", "John", "Eric", "Alan" };
 //只排序前两个
 //[John, Liz, Eric, Alan]
 Arrays.sort(names, 0, 2);
 //全部排序
 //[Alan, Eric, John, Liz]
 Arrays.sort(names);

 public static <T> void sort(T[] a, Comparator<? super T> c) {
     if (LegacyMergeSort.userRequested)
       legacyMergeSort(a, c);
     else
       TimSort.sort(a, c);
   }

String[] arg = {"a", "b", "c", "d"};
 // 结果 [a, b, c, d]
System.out.print(Arrays.toString(arg));