import java.util.ArrayList;

import java.util.Arrays;

import java.util.List;

import java.util.OptionalInt;

import java.util.stream.IntStream;

import java.util.stream.Stream;

public class LambdaExpressionExample {

public static void main(String[] args) {

List<Student> list = new ArrayList<>();

list.add(new Student("A", 11));

list.add(new Student("B", 12));

Stream<Student> studentParallelStream = list.parallelStream();

studentParallelStream.forEach(myPerson -> {

System.out.println(myPerson.getName() + ' ' +Thread.currentThread().getName());

});

Stream<Student> studentStream = list.stream();

studentStream.forEach(myStudent ->

{

String name = myStudent.getName();

int age = myStudent.getAge();

System.out.println(name +"모씨는 "+ age+"살입니다.");

LambdaExpressionExample.print(name);

});

double avg = list.stream()

.mapToInt(Student::getAge)

.average()

.getAsDouble();

System.out.println(avg);

int[] intArray = {1, 2, 3};

IntStream intStream = Arrays.stream(intArray);

OptionalInt mySum = intStream.peek(s-> System.out.println(s)).findFirst();

System.out.println(mySum);

}

private static void print(String name) {

System.out.println(name);

}

}