java的list集合如何根据对象中的某个字段排序

发布网友发布时间：2022-05-02 09:58

共1个回答

热心网友时间：2022-04-25 05:02

下面的代码是根据学生年龄排序学生list 的一个例子：

import java.util.ArrayList;
import java.util.List;

class Student {

private String name;

private int age;

public Student(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;
}

@Override
public String toString() {
return "Perosn [name=" + name + ", age=" + age + "]";
}
}

public class App {

    public static void main(String[] args) {

    List<Student> students = new ArrayList<>();

    students.add(new Student("abc", 12));
    students.add(new Student("bcd", 20));
    students.add(new Student("cde", 17));
    students.add(new Student("def", 25));
    students.add(new Student("efg", 15));

    students.sort((x, y) -> Integer.compare(x.getAge(), y.getAge()));

    for (Student stu : students) {
    System.out.println(stu);
    }
    }
}

运行结果：