利用数组使数据关于一张表格左对角线对称交换

public class Swap{
 public static void main(String[] args){
 char[][] character={{'A','B','C','D'},{'E','F','G','H'},{'I','J','K','L'},{'M','N','O','P'}};
 System.out.println("交换前的字母表");
for(int i=0;i<4;i++){
 for(int j=0;j<4;j++){
 System.out.print(character[i][j]);
 }
 System.out.print("\n");
 }
 for(int i=0;i<4;i++){
 for(int j=i+1;j<4;j++){
 char temp;
 temp=character[i][j];
 character[i][j]=character[j][i];
 character[j][i]=temp;
        }

    }
    System.out.println("交换后的是");
    for(int i=0;i<4;i++){
        for(int j=0;j<4;j++){
            System.out.print(character[i][j]);
        }
        System.out.print("\n");
    }
}
}