java8-tutorial/src/com/winterbe/java8/Streams7.java at master · lan13217/java8-tutorial · GitHub

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package com.winterbe.java8;

import java.util.ArrayList;

import java.util.List;

import java.util.stream.IntStream;

/**

* @author Benjamin Winterberg

public class Streams7 {

static class Foo {

String name;

List<Bar> bars = new ArrayList<>();

Foo(String name) {

this.name = name;

}

static class Bar {

String name;

Bar(String name) {

this.name = name;

}

public static void main(String[] args) {

// test1();

test2();

}

static void test2() {

IntStream.range(1, 4)

.mapToObj(num -> new Foo("Foo" + num))

.peek(f -> IntStream.range(1, 4)

.mapToObj(num -> new Bar("Bar" + num + " <- " + f.name))

.forEach(f.bars::add))

.flatMap(f -> f.bars.stream())

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

}

static void test1() {

List<Foo> foos = new ArrayList<>();

IntStream

.range(1, 4)

.forEach(num -> foos.add(new Foo("Foo" + num)));

foos.forEach(f ->

IntStream

.range(1, 4)

.forEach(num -> f.bars.add(new Bar("Bar" + num + " <- " + f.name))));

foos.stream()

.flatMap(f -> f.bars.stream())

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

}

java8-tutorial/src/com/winterbe/java8/Streams7.java at master · lan13217/java8-tutorial · GitHub

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