Java使用Collectoins的sort方法实现自定义排序

前述如下：

• Student类有年龄和姓名
• 让Student按照年龄排序

代码如下：

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

public class Test {

    public static void main(String[] args) {

        List<Student> list = new ArrayList<Student>();
        list.add(new Student("xxx", 23));
        list.add(new Student("ccc", 21));
        list.add(new Student("vvv", 22));
        Collections.sort(list, new Comparator<Student>() {
            public int compare(Student o1, Student o2) {
                if (o1.age > o2.age) {
                    return 1;
                } else if (o1.age == o2.age) {
                    return 0;
                } else {
                    return -1;
                }
            }
        });

        for (Student student : list) {
            System.out.println(student.name);
        }

    }
}

class Student {
    String name;
    int 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;
    }

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