package com.company;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
/**
* Lamdba表达式作为方法参数
*
* 需求:定义一个person类,带有姓名和年龄的属性,创建多个对象放进集合中,按照年龄升序排列
*/
class Person{
private String name;
private int age;
public Person() {
}
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;
}
@Override
public String toString() {
return "Person{" +
"name='" + name + '\'' +
", age=" + age +
'}';
}
}
public class LamdbaDemo {
public static void main(String[] args) {
ArrayList<Person> list = new ArrayList<>();
list.add(new Person("Kobe",38));
list.add(new Person("james",36));
list.add(new Person("Wade",39));
System.out.println("按照年龄排序前:");
for (Person p :list){
System.out.println(p);
}
//传统的匿名内部类方式
// Collections.sort(list, new Comparator<Person>() {
// @Override
// public int compare(Person o1, Person o2) {
// return o1.getAge()-o2.getAge();
// }
// });
Collections.sort(list,(Person o1, Person o2)->{ return o1.getAge()-o2.getAge();});
System.out.println("按照年龄排序后:");
for (Person p :list){
System.out.println(p);
}
}
}
输出结果:
按照年龄排序前:
Person{name='Kobe', age=38}
Person{name='james', age=36}
Person{name='Wade', age=39}
按照年龄排序后:
Person{name='james', age=36}
Person{name='Kobe', age=38}
Person{name='Wade', age=39}