Java8-Stream-No.07

import java.util.ArrayList;import java.util.List;import java.util.stream.IntStream;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));    }}