Java7和 Java8对 List进行排序实例：
package com.dc.utils;import java.util.*;/** * @author hdc * @date 2019/2/25 * * List 排序 * Lambda表达式ArrayList排序 */public class ListUtil { public static void main(String[] args) { List<Human> humanList = new ArrayList<>(); humanList.add(new Human("tom", 12)); humanList.add(new Human("傲娇的小蜜蜂", 1)); humanList.add(new Human("jay", 23)); System.out.println("排序前：" + humanList); //sortListUserJava7(humanList); sortListJava8(humanList); System.out.println("排序后：" + humanList); } /** * 使用java7对list进行排序 * @param list * * 适用于 List<Map<String, Object>> * Collections.sort(list, new Comparator<Map<String, Object>>(){ * @Override * public int compare(Map<String, Object> map1, Map<String, Object> map2) { * String key1 = map1.get("value").toString(); * String key2 = map2.get("value").toString(); * return key1.compareTo(key2); * } * }); */ public static void sortListJava7(List<Human> list){ Collections.sort(list, new Comparator<Human>(){ @Override public int compare(Human human1, Human human2) { // 这里的 age需要不能是基本类型 return human1.getAge().compareTo(human2.getAge()); } }); } /** * 使用java8对list进行排序 * Lambda表达式排序法 * @param list */ public static void sortListJava8(List<Human> list){ // 这里的 age需要不能是基本类型 Collections.sort(list,(Human human1, Human human2) -> human1.getAge().compareTo(human2.getAge())); }}class Human { private String name; private Integer age; public Human(String name, Integer 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 String toString() { return "Human{" + "name='" + name + ''' + ", age=" + age + '}'; }}输出的结果是：
排序前：[Human{name='tom', age=12}, Human{name='傲娇的小蜜蜂', age=1}, Human{name='jay', age=23}]排序后：[Human{name='傲娇的小蜜蜂', age=1}, Human{name='tom', age=12}, Human{name='jay', age=23}]