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) ;}};