代码
提交代码
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Stream;
public class StreamDemo2 {
static 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 +
'}';
}
}
/**
* 创建一个Person的集合
* @return List
*/
public static List<Person> createPeople() {
ArrayList<Person> people = new ArrayList<>();
Person person1 = new Person("小明", 15);
Person person2 = new Person("小芳", 20);
Person person3 = new Person("小李", 18);
Person person4 = new Person("小付", 23);
Person person5 = new Person("大飞", 22);
people.add(person1);
people.add(person2);
people.add(person3);
people.add(person4);
people.add(person5);
return people;
}
public static void main(String[] args) {
List<Person> people = createPeople();
// 创建 Stream 对象
Stream<Person> stream = people.stream();
// 过滤年龄大于 20 的person
Stream<Person> personStream = stream.filter(person -> person.getAge() >= 20);
// 触发终止操作才能执行中间操作，遍历列表中元素并打印
personStream.forEach(System.out::println);
}
}
运行结果