shuffletest.java

来自「corejava第二卷第二章的源代码」· Java 代码 · 共 25 行

/**
   @version 1.00 1999-07-07
   @author Cay Horstmann
*/

import java.util.*;

/**
   This program demonstrates the random shuffle and sort 
   algorithms.
*/
public class ShuffleTest
{  
   public static void main(String[] args)
   {  
      List numbers = new ArrayList(49);
      for (int i = 1; i <= 49; i++)
         numbers.add(new Integer(i));
      Collections.shuffle(numbers);
      List winningCombination = numbers.subList(0, 6);
      Collections.sort(winningCombination);
      System.out.println(winningCombination);
   }
}