shuffletest.java

这是java2核心技术第七版的源代码

/**
   @version 1.10 2004-08-02
   @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<Integer> numbers = new ArrayList<Integer>();
      for (int i = 1; i <= 49; i++)
         numbers.add(i);
      Collections.shuffle(numbers);
      List<Integer> winningCombination = numbers.subList(0, 6);
      Collections.sort(winningCombination);
      System.out.println(winningCombination);
   }
}