TreeSet对象排序的步骤

TreeSet对象排序的方法

package set;

import java.util.Set ;
import java.util.TreeSet ;
class Person implements Comparable<Person>{
	private String name ;
	private int age ;
	public Person(String name,int age){
		this.name = name ;
		this.age = age ;
	}
	public String toString(){
		return "姓名：" + this.name + "；年龄：" + this.age ;
	}
	public int compareTo(Person per){
		if(this.age>per.age){
			return 1 ;
		}else if(this.age<per.age){
			return -1 ;
		}else{
			return this.name.compareTo(per.name) ;	// 调用String中的compareTo()方法
		}
	}
};
public class TreeSetDemo04{
	public static void main(String args[]){
		Set<Person> allSet = new TreeSet<Person>() ;
		allSet.add(new Person("张三",30)) ;
		allSet.add(new Person("李四",31)) ;
		allSet.add(new Person("王五",32)) ;
		allSet.add(new Person("王五",32)) ;
		allSet.add(new Person("王五",32)) ;
		allSet.add(new Person("赵六",33)) ;
		allSet.add(new Person("孙七",33)) ;
		System.out.println(allSet) ;
	}
};