比较器排序Comparator的使用运行示例

public class TreeSetDemo {
    public static void main(String[] args) {
        //创建集合对象
        TreeSet<Student> treeSet = 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;
            }
        });
        //创建学生对象
        Student s1 = new Student("xishi",29);
        Student s2 = new Student("wangzhaojun",30);
        Student s3 = new Student("diaocan",28);
        Student s4 = new Student("yangyuhuan",31);
        Student s5 = new Student("linqingxia",31);

        //添加元素
        treeSet.add(s1);
        treeSet.add(s2);
        treeSet.add(s3);
        treeSet.add(s4);
        treeSet.add(s5);

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

    }
}

运行结果：