java stream foreach code example

Example 1: java lambda iterate list

List<String> items = new ArrayList<>();
items.add("A");
items.add("B");
items.add("C");
items.add("D");
items.add("E");

//lambda
//Output : A,B,C,D,E
items.forEach(item->System.out.println(item));

//Output : C
items.forEach(item->{
	if("C".equals(item)){
		System.out.println(item);
	}
});

//method reference
//Output : A,B,C,D,E
items.forEach(System.out::println);

//Stream and filter
//Output : B
items.stream()
	.filter(s->s.contains("B"))
	.forEach(System.out::println);

Example 2: foreach java

for (String name : names) {
    System.out.println(name);
}

Example 3: break a java stream foreach

Stream.of("cat", "dog", "elephant", "fox", "rabbit", "duck")
  	.takeWhile(n -> n.length() % 2 != 0)
  	.forEach(System.out::println);

//sysout -> cat
//sysout -> dog

//Same code, no streams

List<String> list = asList("cat", "dog", "elephant", "fox", "rabbit", "duck");
for (int i = 0; i < list.size(); i++) {
    String item = list.get(i);
    if (item.length() % 2 == 0) {
        break;
    }
    System.out.println(item);
}