Java8 中 Comparator 接口提供了一些靜態(tài)方法抛猫，可以方便于我們進(jìn)行排序操作附较，下面通過(guò)例子講解下如何使用

• 對(duì)整數(shù)列表排序（升序）

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

• 對(duì)整數(shù)列表排序（降序）

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

• 根據(jù)對(duì)象屬性（年齡）進(jìn)行排序

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
    }
}

• 根據(jù)對(duì)象屬性（價(jià)格、速度）進(jìn)行排序锨络，需要注意的是赌躺，排序有先后之分，不同的順序會(huì)導(dǎo)致不同的結(jié)果

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));
        // 先以價(jià)格（升序）羡儿、后再速度（升序）
   list.sort(Comparator.comparingInt(Computer::getPrice).thenComparingInt(Computer::getSpeed));
        // 先以速度（降序）礼患、后再價(jià)格（升序）
     list.sort(Comparator.comparingInt(Computer::getSpeed).reversed().thenComparingInt(Computer::getPrice));
        // 先以價(jià)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
    }
}