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))
}
}
转载于:https://www.cnblogs.com/bilaisheng/p/10210931.html
