Stream流式计算

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

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

public class StreamTest {
    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,"f",25);

        //集合就是存储
        List<User> list = Arrays.asList(u1,u2,u3,u4,u5);
        //stream流计算
        list.stream().filter(u-> {return u.getId()%2 == 0;})//User(id=2, name=b, age=22)User(id=4, name=d, age=24)User(id=6, name=f, age=25)
        .filter(u->u.getAge() > 23)//User(id=4, name=d, age=24)User(id=6, name=f, age=25)
                .map(u->{return u.getName().toUpperCase();})//DF
                .sorted((uu1,uu2)->{
                    return uu2.compareTo(uu1);//FD
                })
                .limit(1)//F
                .forEach(System.out::print);
    }
}
@Data   //生成tostring和get&&set方法
@NoArgsConstructor  //生成无参构造方法
@AllArgsConstructor //生成全部有参构造方法
class  User{
    private int id;
    private String  name;
    private int age;
}