Lambdas in Java(1.8) - 5 - Streams API - iterations simplified / MethodReference

Collection.stream()

import java.util.Arrays;
import java.util.List;
import java.util.function.Consumer;

public class Java8StreamsToPrintList {

public static void main(String[] args) {
List<Person> people = Arrays.asList(
new Person("Gallen","Burchhill"),
new Person("Allen","churchhill"),
new Person("Alex","garten"),
new Person("Sam","Batley"));

people.stream()
.filter(person-> person.firstName.startsWith("A"))
.forEach(person->System.out.println(person));

System.out.println("---------------------------------");

int numberOfPplStartsWithA = 
(int) people.stream()
.filter(person-> person.firstName.startsWith("A"))
.count();
System.out.println(numberOfPplStartsWithA);

System.out.println("--------METHOD REFERENCE, equivalent-----------");
//Using Method reference to print all values in List
printAllPeople(people,System.out::println);
               //System.out::println is same as person->System.out.println(person)
}

private static void printAllPeople(List<Person> people, Consumer<Person> consumer) {
for (Person person: people) {
consumer.accept(person);
}

}

}

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