import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;

public class HashSetDemo {
	
	public static void main(String[] args){
		List tableList = new ArrayList();
		tableList.add("hello");
		tableList.add("hell0");
		tableList.add("world");
		tableList.add("world");
		tableList.add(2);
		tableList.add(2);
		tableList.add(true);
		tableList.add(true);
        HashSet hs = new HashSet(tableList);
        //System.out.println(hs.toString());
        //System.out.println(tableList);
        Iterator i = hs.iterator();
        while(i.hasNext()){
               Object temp = i.next();
               System.out.println(temp.toString());
        } 
	}

}
 

輸出：

 2
true
hell0
hello
world