求大神解析一下怎么用循环嵌套多维数组

import java.util.*;
public class A5_10{
    public static void main(String []args){
        Scanner in=new Scanner(System.in);
        String [][] arr=new String[3][];
        arr[0]=new String[2];
        arr[1]=new String[2];
        arr[2]=new String[2];
        for(int i=0;i<=arr[0].length-1;i++){
            System.out.println("请输入姓名：");
            arr[0][i]=in.next();
        }
        for(int i=0;i<=arr[1].length-1;i++){
            System.out.println("请输入姓名：");
            arr[1][i]=in.next();
        }
        for(int i=0;i<=arr[2].length-1;i++){
            System.out.println("请输入姓名：");
            arr[2][i]=in.next();
        }
        for(int i=0;i<=arr[0].length-1;i++){
            System.out.print(arr[0][i]+"\t");
            if(i==1){
                System.out.println();
            }
        }
        for(int i=0;i<=arr[1].length-1;i++){
            System.out.print(arr[1][i]+"\t");
            if(i==1){
                System.out.println();
            }
        }
        for(int i=0;i<=arr[2].length-1;i++){
            System.out.print(arr[2][i]+"\t");
            if(i==1){
                System.out.println();
            }
        }
    }
}