JUC并发编程-Stream流式计算

Stream流式计算

package com.zkw.JUC并发编程.functiom.stream;

public class User {
    
    
    private int ID;
    private String name;
    private  int age;

    public User() {
    
    
    }

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

    public int getID() {
    
    
        return ID;
    }

    public void setID(int ID) {
    
    
        this.ID = ID;
    }

    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 "User{" +
                "ID=" + ID +
                ", name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

package com.zkw.JUC并发编程.functiom.stream;

import java.util.Arrays;
import java.util.List;

/**
 * 题目要求：一分钟内完成，只能写一行代码
 * 我现在有5个用户！筛选
 * 1、ID必须是偶数
 * 2、年龄必须大于23岁
 * 3、用户名字必须为大写
 * 4、用户名字导致排序
 * 5、只输出一个用户
 */
public class Test {
    
    
    public static void main(String[] args) {
    
    
        User u1 = new User(1,"a",21);
        User u2 = new User(2,"b",22);
        User u3 = new User(3,"c",23);
        User u4 = new User(4,"d",24);
        User u5 = new User(6,"e",25);

        //集合存储
        List<User> list = Arrays.asList(u1, u2, u3, u4, u5);

        // 计算交给Stream流
        // lambda表达式、链式编程、函数式接口、Stream流计算
        list.stream()
                .filter(u ->{
    
    return u.getID()%2==0;})
                .filter(u ->{
    
    return u.getAge()>23;})
                .map(u ->{
    
    return u.getName().toUpperCase();})
                .sorted((name1,name2)->{
    
    return name2.compareTo(name1);})
                .limit(1)
                .forEach(System.out::println);
    }
}