黑马程序员——TreeSet实现Comparator接口对自定义类排序

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package collection.set;

import java.util.Comparator;
import java.util.Iterator;
import java.util.TreeSet;

public class TreeSet_Comparator {
	public static void main(String[] args) {
		TreeSet ts=new TreeSet(new MyComparator());
		ts.add(new Person("a003",33));
		ts.add(new Person("a033",43));
		ts.add(new Person("a023",22));
		ts.add(new Person("a03",54));
		ts.add(new Person("a013",87));
		ts.add(new Person("a83",33));
		ts.add(new Person("a83",32));
		Iterator iter=ts.iterator();
		while(iter.hasNext()){
			Person p=(Person)iter.next();
			System.out.println(p.getName()+",,,,,,"+p.getAge());
		}
	}
	
}
class MyComparator implements Comparator{

	public int compare(Object a, Object b) {
		if(!(a instanceof Person)||!(b instanceof Person)){
			return -1;
		}
		Person pa=(Person)a;
		Person pb=(Person)b;
		int num=pa.getName().compareTo(pb.getName());
		if(0==num){
			return new Integer(pa.getAge()).compareTo(new Integer(pb.getAge()));
		}
		return num;
	}
	
}
class Person{
	private String name;
	private int age;
	public Person(String name,int age){
		this.name=name;
		this.age=age;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
}

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