旋转图像

public static void main(String[] args) {
    int[][] matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
    print(matrix);
    rotate(matrix);
    System.out.println("----------------------");
    print(matrix);
  }

  public static void rotate(int[][] matrix) {
    /*矩阵宽*/
    int x = matrix.length;
    /*复制一个矩阵*/
    int[][] copy=copy(matrix);
    for (int i = 0; i < x; i++) {
      for (int j = 0; j < x; j++) {
        /*旋转90度，按照规律可得如下赋值*/
        matrix[j][x-1-i]=copy[i][j];
      }
    }
  }

  public static int[][] copy(int[][] matrix){
    int x=matrix.length;
    int[][] copy=new int[x][x];
    for (int i = 0; i < x; i++) {
      for (int j = 0; j < x; j++) {
        copy[i][j]=matrix[i][j];
      }
    }
    return copy;
  }

  public static void print(int[][] matrix) {
    for (int i = 0; i < matrix.length; i++) {
      for (int j = 0; j < matrix[i].length; j++) {
        System.out.print(matrix[i][j]);
        System.out.print(" ");
      }
      System.out.println();
    }
  }