Iterate maps and lists with Java

May 2nd, 2019

Basic Java iteration loops, just for reference :)

	public void iterateUsingEntrySet(Map<String, Integer> map) {
	for (Map.Entry<String, Integer> entry : map.entrySet()) {
	System.out.println(entry.getKey() + ":" + entry.getValue());
	}
	}

	public void iterateUsingIteratorAndEntry(Map<String, Integer> map) {
	Iterator<Map.Entry<String, Integer>> iterator = map.entrySet().iterator();
	while (iterator.hasNext()) {
	Map.Entry<String, Integer> entry = iterator.next();
	System.out.println(entry.getKey() + ":" + entry.getValue());
	}
	}

	public void iterateUsingLambda(Map<String, Integer> map) {
	map.forEach((k, v) -> System.out.println((k + ":" + v)));
	}

	public void iterateUsingStreamAPI(Map<String, Integer> map) {
	map.entrySet().stream()
	// ...
	.forEach(e -> System.out.println(e.getKey() + ":" + e.getValue()));
	}

	public static void iterateThroughList(List<String> list){
	list.forEach(name->System.out.println(name));
	}

view raw IterateMaps.java hosted with ❤ by GitHub