Answer by vivekkurien for In detail, how does the 'for each' loop work in Java?

In Java 8, they introduced forEach. Using it List, Maps can be looped.

Loop a List using for each

List<String> someList = new ArrayList<String>();someList.add("A");someList.add("B");someList.add("C");someList.forEach(listItem -> System.out.println(listItem))

or

someList.forEach(listItem-> {     System.out.println(listItem); });

Loop a Map using for each

Map<String, String> mapList = new HashMap<>();    mapList.put("Key1", "Value1");    mapList.put("Key2", "Value2");    mapList.put("Key3", "Value3");mapList.forEach((key,value)->System.out.println("Key: "+ key +" Value : "+ value));

or

mapList.forEach((key,value)->{    System.out.println("Key : "+ key +" Value : "+ value);});