import java.util.*;
public class BasicContainer {
    public static void main(String args[]) {
        Collection c = new HashSet();
        Name n = new Name("ye","dame");
        Name m = new Name("ye","dame");
        c.add(n);
        System.out.println(c.remove(m));
        System.out.println(c);
    }
}

class Name{
    String firstname;
    String secondname;
    
    Name(String firstname,String secondname) {
        this.secondname = secondname;
        this.firstname = firstname;
    }
    
    public boolean equals(Name n) {
        return (this.secondname.equals(n.secondname)) && (this.firstname.equals(n.firstname));
        
    }
    public int hashCode() {
        return firstname.hashCode();
    }
}