JavaList对象排序技巧详解

class Person {
    private String name;
    private int age;

    // 构造函数
    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    // getter方法
    public String getName() { return name; }
    public int getAge() { return age; }

    @Override
    public String toString() {
        return name + "(" + age + ")";
    }
}

List<Person> people = new ArrayList<>();
people.add(new Person("Alice", 30));
people.add(new Person("Bob", 25));
people.add(new Person("Charlie", 35));

// 按年龄升序排序
people.sort(Comparator.comparing(Person::getAge));

System.out.println(people);
// 输出: [Bob(25), Alice(30), Charlie(35)]

people.sort(Comparator.comparing(Person::getAge)
                    .thenComparing(Person::getName));

// 按年龄降序
people.sort(Comparator.comparing(Person::getAge).reversed());

List<Person> sorted = people.stream()
    .sorted(Comparator.comparing(Person::getName))
    .collect(Collectors.toList());