ArrayList集合存储学生并排序

package com.czie.iot1913.lps.genericityDemo.Collections;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

/**
 * @author 1944900433@qq.com
 * @date 2022-03-20 22:59
 */
public class ArrayTest01 {
    public static void main(String[] args) {
        //创建集合对象
        ArrayList<Student> array = new ArrayList<Student>();
        //创建学生对象
        Student s1 = new Student("刘品水",21);
        Student s2 = new Student("刘水",25);
        Student s3 = new Student("b水",18);
        Student s4 = new Student("a水",18);
        //把学生添加到集合
        array.add(s1);
        array.add(s2);
        array.add(s3);
        array.add(s4);

        //static <T> void sort(List<T> list, Comparator<? super T> c)
        //根据指定的比较器指定的顺序对指定的列表进行排序。

        Collections.sort(array, new Comparator<Student>() {
            @Override
            public int compare(Student s1, Student s2) {
                int num1=s1.getAge()-s2.getAge();
                int num2=num1==0?s1.getName().compareTo(s2.getName()):num1;
                return num2;
            }
        });
        for (Student s:array){
            System.out.println(s.getName()+","+s.getAge());
        }



    }
}

package com.czie.iot1913.lps.genericityDemo.Collections;

/**
 * @author 1944900433@qq.com
 * @date 2022-03-20 22:59
 */
public class Student {
    private String name;
    private int age;

    public Student() {
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }
}