java例程练习（Comparable接口）

import java.lang.Comparable;
import java.util.List;
import java.util.LinkedList;
import java.util.Collections;

public class TestCompareTo {

	public static void main(String[] args) {
		List l1 = new LinkedList();
		
		l1.add(new Name("Karl", "M"));
		l1.add(new Name("Stever", "Lee"));
		l1.add(new Name("John", "O"));
		l1.add(new Name("Tom", "M"));
		
		System.out.println(l1);
		
		Collections.sort(l1);
		System.out.println(l1);
			
	}
}

class Name implements Comparable{
	private String firstName;
	private String lastName;
	
	Name(String firstName, String lastName) {
		this.setFirstName(firstName);
		this.setLastName(lastName);
	}
	
	public void setFirstName(String firstName) {
		this.firstName = firstName;
	}
	
	public String getFirstName() {
		return firstName;
	}
	
	public void setLastName(String lastName) {
		this.lastName = lastName;
	}
	
	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();
	}
	
	public int compareTo(Object o) {
		Name n = (Name) o;
		int lastCmp = lastName.compareTo(n.lastName);
		return (lastCmp != 0 ? lastCmp : firstName.compareTo(n.firstName));
	}
	
}