list 多種排序，java8 ，Lambda寫法，升序降序，多條件排序

package com.xiong.test.group_sort;
 
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
 
/**
 * @author Tan
 * @version V1.0
 * @description: GroupTestMain
 * @date 2019/9/27
 */
public class SortTestMain {
 
    public static void main(String[] args) {
        List<Person> persons = new ArrayList<>();//列表
 
        persons.add(new Person("aaa", 12));
        persons.add(new Person("ccc", 20));
        persons.add(new Person("bbb", 8));
 
 
        //no 1. Collections排序
 
        System.out.println("Age排序前：");
        persons.forEach((person)->System.out.println(person));
 
        //Collections排序升序
        Collections.sort(persons, new Comparator<Person>() {
            @Override
            public int compare(Person o1, Person o2) {
                return o1.getAge().compareTo(o2.getAge());
            }
        });
 
        System.out.println("Age升序排序後：");
        persons.forEach((person)->System.out.println(person));
 
        //Collections排序降序
        Collections.sort(persons, new Comparator<Person>() {
            @Override
            public int compare(Person o1, Person o2) {
                return o2.getAge().compareTo(o1.getAge());
            }
        });
 
        //循環打印
        System.out.println("Age降序排序後：");
        persons.forEach((person)->System.out.println(person));
 
        System.out.println("***************************************************************");
 
        // no 2.Lambda寫法，JAVA8的寫法
        // persons.sort((Developer o1, Developer o2)->o1.getAge().compareTo(o2.getAge())); //可以更簡潔，如下：
 
        //升序排序
        persons.sort((a, b) -> a.getName().compareTo(b.getName()));
        System.out.println("Name升序排序後：");
        persons.forEach((person)->System.out.println(person));
 
 
        //降序排序, a,b倒轉即可
        persons.sort((a, b) -> b.getName().compareTo(a.getName()));
        System.out.println("Name降序排序後：");
        persons.forEach((person)->System.out.println(person));
 
        //升序排序
        persons.sort(Comparator.comparing(Person::getAge));
        System.out.println("Age升序排序：");
        persons.forEach((person)->System.out.println(person));
 
        //降序排序, 加上 .reversed() 即可
        persons.sort(Comparator.comparing(Person::getAge).reversed());
        System.out.println("Age降序排序：");
        persons.forEach((person)->System.out.println(person));
 
        //先配置再排序
        Comparator<Person> ageComparator = (o1, o2)->o1.getName().compareTo(o2.getName());
        persons.sort(ageComparator);                //按上面配置的順序取值
        System.out.println("Name升序排序後：");
        persons.forEach((person)->System.out.println(person));
 
        System.out.println("Name降序排序後：");
        persons.sort(ageComparator.reversed());     //按上面配置的順序反向取值
        persons.forEach((person)->System.out.println(person));
 
 
        // 多條件排序第二個寫法，先按Age排序，再根據name排序
        persons.sort(Comparator.comparing(Person::getAge).thenComparing(Person::getName));
        System.out.println("多條件排序後：");
        persons.sort(ageComparator.reversed());     //按上面配置的順序反向取值
        persons.forEach((person)->System.out.println(person));
 
    }
 
 
}

public class Person {
    private String name;
    private Integer age;
 
    public Person(String name, int age) {
        this.age = age;
        this.name = name;
    }
}
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原文鏈接：https://blog.csdn.net/zhan107876/article/details/101556373