比较器排序Coamparator

参数为一个匿名内部类

代码如下：

 

package com.Test01;

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

public class TreeSetDemo {
    public static void main(String[] args) {
        TreeSet<Student> ts = new TreeSet<Student>(new Comparator<Student>() {
            @Override

            public int compare(Student s1, Student s2) {
                int num = s1.getAge()-s2.getAge();
                int num2 = (num == 0 ? s1.getName().compareTo(s2.getName()):num);
                return num2;
            }
        });
        Student s1 = new Student("xishi", 29);
        Student s2 = new Student("diaochan", 29);
        Student s3 = new Student("yangyuhuan", 21);
        Student s4 = new Student("wangzhaojun", 26);

        ts.add(s1);
        ts.add(s2);
        ts.add(s3);
        ts.add(s4);

        for (Student s : ts) {
            System.out.println(s.getName() + "," + s.getAge());
        }
    }
}