BAEL-2933 The Difference Between Collection.stream().forEach() and Collection.forEach() (#7191)

This commit is contained in:
Maiklins
2019-06-29 16:03:56 +02:00
committed by KevinGilmore
parent f2c6eb9c10
commit 783a93fb47

View File

@@ -1,84 +0,0 @@
package com.baeldung.forEach;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.function.Consumer;
class ReverseList extends ArrayList<String> {
List<String> list = Arrays.asList("A", "B", "C", "D");
Consumer<String> removeElement = s -> {
System.out.println(s + " " + list.size());
if (s != null && s.equals("A")) {
list.remove("D");
}
};
@Override
public Iterator<String> iterator() {
final int startIndex = this.size() - 1;
final List<String> list = this;
return new Iterator<String>() {
int currentIndex = startIndex;
@Override
public boolean hasNext() {
return currentIndex >= 0;
}
@Override
public String next() {
String next = list.get(currentIndex);
currentIndex--;
return next;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
};
}
public void forEach(Consumer<? super String> action) {
for (String s : this) {
action.accept(s);
}
}
public void iterateParallel() {
list.forEach(System.out::print);
System.out.print(" ");
list.parallelStream().forEach(System.out::print);
}
public void iterateReverse() {
List<String> myList = new ReverseList();
myList.addAll(list);
myList.forEach(System.out::print);
System.out.print(" ");
myList.stream().forEach(System.out::print);
}
public void removeInCollectionForEach() {
list.forEach(removeElement);
}
public void removeInStreamForEach() {
list.stream().forEach(removeElement);
}
public static void main(String[] argv) {
ReverseList collectionForEach = new ReverseList();
collectionForEach.iterateParallel();
collectionForEach.iterateReverse();
collectionForEach.removeInCollectionForEach();
collectionForEach.removeInStreamForEach();
}
}