Collection类

import java.util.Collection;
import java.util.HashSet;

public class BasicContainer {
	public static void main(String[] args) {
		Collection c = new HashSet();
		c.add("hello");
		c.add(new Name("f1", "f2"));
		c.add(new Integer(100));
		c.remove("hello");
		c.remove(new Integer(100));
		System.out.println(c.remove(new Name("f1", "f2")));
		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();
	}
}