二维数组：

int arr[][] = new int[][]{

{1,2,3},{4,5,6},{7,8,9}};

1、遍历二维数组

public class demo01 {		public static void main(String[] args) {				//静态初始化		int arr[][] = new int[][]{
    {1,2,3},{4,5,6},{7,8,9}};		int i,j;	    //遍历二维数组		for(i=0;i

　二、给数组赋值并输出

public class demo02 {	public static void main(String[] args) {		int arr[][] = new int[3][3];				arr[2][2] = 2;		for(int i=0;i

　三、冒泡排序

public class demo03 {	public static void main(String[] args) {				//冒泡法		int arr[] = new int[]{4,21,0,-12,-3};		int temp;				for(int i=0;i
     
      arr[j+1]){					temp = arr[j];					arr[j] = arr[j+1];					arr[j+1] = temp;				}			}		}				for(int num:arr){			System.out.print(num+" ");		}	}}