public class Student1 implements Comparable<Student1> {

    private String name;

    private int age;

    public Student1() {

    }

    public Student1(String name, int age) {

        this.name = name;

        this.age = age;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public Integer getAge() {

        return age;

    }

    public void setAge(Integer age) {

        this.age = age;

    }

    @Override

    public int compareTo(Student1 s) {

        int num = this.age - s.age;

        int num1 = (num == 0 ? this.name.compareTo(s.name) : num);

        return num1;

    }

}

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

public class Student1Test {

    public static void main(String[] args) {

        List<Student1> list1 = new ArrayList<Student1>();

        list1.add(new Student1("林青霞", 27));

        list1.add(new Student1("风清扬", 30));

        list1.add(new Student1("刘晓曲", 28));

        list1.add(new Student1("武鑫", 29));

        list1.add(new Student1("林青霞", 27));

        Collections.sort(list1);

        for (Student1 s : list1) {

            System.out.println(s.getName() + "---" + s.getAge());

        }

    }

}

public class Student2 {

    private String name;

    private int age;

    public Student2() {

    }

    public Student2(String name, int age) {

        this.name = name;

        this.age = age;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public Integer getAge() {

        return age;

    }

    public void setAge(Integer age) {

        this.age = age;

    }

}

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.List;

public class Student2Test {

    public static void main(String[] args) {

        List<Student2> list2 = new ArrayList<Student2>();

        list2.add(new Student2("林青霞", 27));

        list2.add(new Student2("风清扬", 30));

        list2.add(new Student2("刘晓曲", 28));

        list2.add(new Student2("武鑫", 29));

        list2.add(new Student2("林青霞", 27));


        //方式一

        Collections.sort(list2, new MyComparator());

        for (Student2 s : list2) {

            System.out.println(s.getName() + "---" + s.getAge());

        }


        //逆序
        //方式二：匿名类

        Collections.sort(list2, new Comparator<Student2>() {

            @Override

            public int compare(Student2 s1, Student2 s2) {

                int num = s2.getAge() - s1.getAge();

                int num1 = (num == 0 ? s2.getName().compareTo(s1.getName())

                        : num);

                return num1;

            }

        });

        for (Student2 s : list2) {

            System.out.println(s.getName() + "---" + s.getAge());

        }

    }

}

class MyComparator implements Comparator<Student2> {

    @Override

    public int compare(Student2 s1, Student2 s2) {

        int num = s1.getAge() - s2.getAge();

        int num1 = (num == 0 ? s1.getName().compareTo(s2.getName()) : num);

        return num1;

    }

}