import java.util.*;
public class BasicContainer
{
    public static void main(String args[])
    {
Collection c=new HashSet();
c.add("hello");
c.add(new Name("fi","li"));
c.add(new Integer(100));
System.out.println(c);

c.remove("hello");
c.remove(new Integer(100));
System.out.println(c.remove(new Name("fi","li")));
System.out.println(c);

}
}
class Name
{
    private String firstName,lastName;
    public Name(String firstName,String lastName)
    {
        this.firstName=firstName;
        this.lastName=lastName;
        }
        public String getFirstName()
        {return firstName;}
        public String getLastName()
        {return lastName;}
        public String toString() 
        {return firstName+"  "+lastName;}
            
        
    
/*public boolean equals(Object  obj)
    {
        if(obj instanceof Name)
        {
        Name name=(Name) obj;
        return (firstName.equals(name.firstName))&&(lastName.equals(name.lastName));
      }
      return super.equals(obj);
    }
    public int hashCode()
    {
        return firstName.hashCode();
        }*/
        }