java map取第一个元素_Java Stream - 如何map对象获取一个属性，然后过滤并获取前10个，最后输出...

import java.util.Arrays;

import java.util.List;

public class Main{

public static void main(String[] argv){

List persons = Arrays.asList(new Person("HTML", 12), new Person("Aim", 34), new Person("John", 23));

persons.stream()

.map(Person::getFirstName)

.filter(name -> name.startsWith("A"))

.limit(10)

.forEach(name -> System.out.println(name));

}

}

class MyWrapper {

private Person person;

public MyWrapper(Person person) {

this.person = person;

}

public Person getPerson() {

return person;

}

public void setPerson(Person person) {

this.person = person;

}

}

class Person {

private String firstName;

private String lastName;

private int age;

public Person(String firstName) {

this.firstName = firstName;

}

public Person(String firstName, int age) {

this.firstName = firstName;

this.age = age;

}

public String getFirstName() {

return firstName;

}

public void setFirstName(String firstName) {

this.firstName = firstName;

}

public String getLastName() {

return lastName;

}

public void setLastName(String lastName) {

this.lastName = lastName;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

@Override

public String toString() {

return "Person [firstName=" + firstName + ", lastName=" + lastName

+ ", age=" + age + "]";

}

}