按对象属性排序对象的ArrayList

public class Person {
    private String name;
    private int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

List<Person> personList = new ArrayList<>();
personList.add(new Person("张三", 25));
personList.add(new Person("李四", 30));
personList.add(new Person("王五", 20));

Collections.sort(personList, new Comparator<Person>() {
    @Override
    public int compare(Person o1, Person o2) {
        return o1.getAge() - o2.getAge();
    }
});

@Override
public int compare(Person o1, Person o2) {
    return o1.getName().compareTo(o2.getName());
}