## Java8Comparator排序方法实例详解

2020年02月13日 编程语言 ⁄ 共 2130字 ⁄ 字号 评论关闭

Java8 中 Comparator 接口提供了一些静态方法，可以方便于我们进行排序操作，下面通过例子讲解下如何使用

List<Integer> list = Arrays.asList(1, 4, 2, 6, 2, 8);list.sort(Comparator.naturalOrder());System.out.println(list);

List<Integer> list = Arrays.asList(1, 4, 2, 6, 2, 8);list.sort(Comparator.reverseOrder());System.out.println(list);

public class Test { public static void main(String[] args) { List<Person> personList = new ArrayList<>(); personList.add(new Person("a", 2)); personList.add(new Person("b", 4)); personList.add(new Person("c", 7)); // 升序 personList.sort(Comparator.comparingInt(Person::getAge)); // 降序 personList.sort(Comparator.comparingInt(Person::getAge).reversed()); System.out.println(personList); } public static class Person { private String name; private Integer age; public Person(String name, Integer age) { this.name = name; this.age = age; } public Integer getAge() { return age; } // ... toString 方法 }}

public class Test { public static void main(String[] args) { List<Computer> list = new ArrayList<>(); list.add(new Computer("xiaomi",4000,6)); list.add(new Computer("sony",5000,4)); list.add(new Computer("dell",4000,5)); list.add(new Computer("mac",6000,8)); list.add(new Computer("micro",5000,6)); // 先以价格（升序）、后再速度（升序） list.sort(Comparator.comparingInt(Computer::getPrice).thenComparingInt(Computer::getSpeed)); // 先以速度（降序）、后再价格（升序） list.sort(Comparator.comparingInt(Computer::getSpeed).reversed().thenComparingInt(Computer::getPrice)); // 先以价格（降序）、后再速度（降序） list.sort(Comparator.comparingInt(Computer::getPrice).thenComparingInt(Computer::getSpeed).reversed()); System.out.println(list); } public static class Computer { private String name; private Integer price; private Integer speed; public Computer(String name, Integer price, Integer speed) { this.name = name; this.price = price; this.speed = speed; } public Integer getPrice() { return price; } public void setPrice(Integer price) { this.price = price; } public Integer getSpeed() { return speed; } public void setSpeed(Integer speed) { this.speed = speed; } // ... toString 方法 }}