1.6---旋转二维数组，旋转图像像素，旋转矩阵，90度（CC150）

import java.util.*;
 
public class Transform {
    public int[][] transformImage(int[][] matrix, int n) {
        // write code here
           n = matrix.length;
        int limit = (n-1)/2;
        for(int i=0;i<=limit; i++){
            for(int j=i;j<n-i-1;j++){
                int temp = matrix[i][j];
                matrix[i][j] = matrix[n-1-j][i];
                matrix[n-1-j][i] = matrix[n-1-i][n-1-j];
                matrix[n-1-i][n-1-j] = matrix[j][n-1-i];
                matrix[j][n-1-i] = temp;
            }
        }
   
        return matrix;
    }
}