StreamTest.java

import java.util.ArrayList;
import java.util.List;
/**
 *
 * @author NguyenHaiDang@ActiveStudy
 */
public class StreamTest {
    public static void main(String[] args) {
        List<Person> people = new ArrayList<>();
        people.add(new Person(18, "Joe"));
        people.add(new Person(20, "Jack"));
       
        people.stream()
                .map(p -> p.getAge())           
                .peek(System.out::println)      //(1)
                .filter(age -> age < 20)        
                .peek(System.out::println);     //thay forEach bằng peek (2)
    }
}