java HashSetÈ¥ÖØʾÀý

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());
}
}
}
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 2
true
hell0
hello
world