矩阵转换

public class JZZH {
   
    public static void main(String[] args) {
       int[]arr[]= {{1,2,3},{4,5,6},{7,8,9}};
       int i,j;
       int D=0;
       for(i=0;i<3;i++) {
           for(j=0;j<3;j++) {
               if(i+j<3) {
                   D=arr[i][j];
                   arr[i][j]=arr[2-i][2-j];
                   arr[2-i][2-j]=D;
               }
           }
       }
       for(i=0;i<3;i++) {
           for(j=0;j<3;j++) {
               System.out.print(arr[i][j]);
               System.out.print("\t");
           }
           System.out.print("\n");
       }
    }

}