如何在Java中使用Comparator进行排序

你的示例类有几件尴尬的事情：

• 它有个

  price

  和时称为人

  info

  （更多用于对象，而不是人）；
• 当将一个类命名为某个事物的复数形式时，这表明它是对多个事物的抽象。

无论如何，这是如何使用的演示

Comparator<T>

public class ComparatorDemo {    public static void main(String[] args) {        List<Person> people = Arrays.asList(     new Person("Joe", 24),     new Person("Pete", 18),     new Person("Chris", 21)        );        Collections.sort(people, new LexicographicComparator());        System.out.println(people);        Collections.sort(people, new AgeComparator());        System.out.println(people);    }}class LexicographicComparator implements Comparator<Person> {    @Override    public int compare(Person a, Person b) {        return a.name.compareToIgnoreCase(b.name);    }}class AgeComparator implements Comparator<Person> {    @Override    public int compare(Person a, Person b) {        return a.age < b.age ? -1 : a.age == b.age ? 0 : 1;    }}class Person {    String name;    int age;    Person(String n, int a) {        name = n;        age = a;    }    @Override    public String toString() {        return String.format("{name=%s, age=%d}", name, age);    }}

编辑
等效的Java 8演示如下所示：

public class ComparatorDemo {    public static void main(String[] args) {        List<Person> people = Arrays.asList(     new Person("Joe", 24),     new Person("Pete", 18),     new Person("Chris", 21)        );        Collections.sort(people, (a, b) -> a.name.compareToIgnoreCase(b.name));        System.out.println(people);        Collections.sort(people, (a, b) -> a.age < b.age ? -1 : a.age == b.age ? 0 : 1);        System.out.println(people);    }}