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public class ArrayArrayDemo_2{
public static void main(String[] args){
int[][] arr = { {1,2,3},{4,5},{6,7,8,9},{0} };

//外循环,遍历二维数组
for(int i = 0 ; i < arr.length ;i++){
//内循环,遍历每个一维数组 arr[0] arr[1] arr[i]
for(int j = 0 ; j < arr[i].length; j++){
System.out.print(arr[i][j]);
}
System.out.println();
}
}
}