import java.util.HashSet;
public class Main {
public static void main(String[] args) {
HashSet hSet = new HashSet();
hSet.add(new Integer("1"));
hSet.add(new Integer("2"));
hSet.add(new Integer("3"));
System.out.println("HashSet contains.." + hSet);
}
}
//HashSet contains..[1, 2, 3]