java.util.HashSet.clone() 方法

package com.codingdict;

import java.util.*;

public class HashSetDemo {
   public static void main(String args[]) {

      // create two hash sets     
      HashSet <String> newset = new HashSet <String>();
      HashSet <String> cloneset = new HashSet <String>();

      // populate hash set
      newset.add("Learning");
      newset.add("Easy");
      newset.add("Simply");  

      // clone the hash set
      cloneset = (HashSet)newset.clone();

      System.out.println("Hash set values: "+ newset);      
      System.out.println("Clone Hash set values: "+ cloneset);
   }    
}