1.9 作业 矩阵转置与输出九宫格

int arr[][] = {{1,2,3},{4,5,6},{7,8,9}};
        
        System.out.println("转置前的矩阵是：");
        
        printArray(arr);
        
        int arr2[][] = new int[arr.length][arr.length];
        
        for(int i = 0;i < arr.length;i++)
        {
            for(int j =0;j < arr[i].length;j++)
            {
                arr2[j][i] = arr[i][j];
            }
        }
        System.out.println("转置后的矩阵是： ");
        printArray(arr2);
    }

    private static void printArray(int[][] arr) {
        // TODO 自动生成的方法存根
    
        for(int i = 0;i < arr.length;i++)
        {
            for(int j = 0;j < arr.length;j++)
            {
                System.out.print(arr[i][j]+ " ");
            }
            System.out.println();
        }

int jiu[][] = new int [3][3];
        
        int a =2;
        
        int b = 3/2;
        
        for(int e = 1; e <= 9;e++)
        {
            jiu[a++][b++] = e;
            if(e%3 ==0)
            {
                a = a-2;
                b = b-1;
                }
            else
            {
                a = a%3;
                b = b%3;
            }
        }
        System.out.println("输出九宫格："); 
        for(int e=0;e<3;e++)
        {
            for(int f=0; f<3;f++)
            {
                System.out.print(jiu[e][f] + "  ");
            }
            System.out.print("\n");
        }

比着打的，木看懂。。。(>~<)