第八章第十八题（打乱行）（Disorganize）

第八章第十八题（打乱行）（Disorganize）

• *8.18（打乱行）编写一个方法，使用下面的方法头打乱一个二维int型的行：
  public static void shuffle(int[][] m)
  编写一个测试程序，打乱下面的矩阵：
  int[][] m = {{1,2},{3,4},{5,6},{7,8},{9,10}};
  *8.18（Disorganize）Write a method to scramble a two-dimensional int line with the following method header:
  public static void shuffle(int[][] m)
  Write a test program to disrupt the following matrix:
  int[][] m = {{1,2},{3,4},{5,6},{7,8},{9,10}};

• 参考代码：

  package chapter08;
  
  public class Code_18 {
      public static void main(String args[]){
          int[][] m = {{1,2},{3,4},{5,6},{7,8},{9,10}};
          shuffle(m);
          for(int i = 0; i < m.length; ++i){
              for(int j = 0; j < m[i].length; ++j){
                  System.out.print(m[i][j] + " ");
              }
              System.out.println();
          }
      }
  
      public static void shuffle(int[][] m){
          int xlen = m.length;
          int ylen = m[0].length;
          for(int i = 0; i < xlen; ++i){
              for(int j = 0; j < ylen; ++j){
                  int n = (int)(Math.random()*ylen);
                  int temp = m[i][n];
                  m[i][n] = m[i][j];
                  m[i][j] = temp;
              }
              int q = (int)(Math.random() * xlen);
              int[] temp1 = m[q];
              m[q] = m[i];
              m[i] = temp1;
          }
      }
  }
  
  

• 结果显示：

  1 2 
  6 5 
  10 9 
  8 7 
  3 4 
  
  Process finished with exit code 0