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

As defined in JLS, a for-each loop can have two forms:

1. If the type of expression is a subtype of Iterable then translation is as:

   List<String> someList = new ArrayList<String>();someList.add("Apple");someList.add("Ball");for (String item : someList) {    System.out.println(item);}// Is translated to:for(Iterator<String> stringIterator = someList.iterator(); stringIterator.hasNext(); ) {    String item = stringIterator.next();    System.out.println(item);}

2. If the expression necessarily has an array type T[] then:

   String[] someArray = new String[2];someArray[0] = "Apple";someArray[1] = "Ball";for(String item2 : someArray) {    System.out.println(item2);}// Is translated to:for (int i = 0; i < someArray.length; i++) {    String item2 = someArray[i];    System.out.println(item2);}

Java 8 has introduced streams which perform generally better with a decent size dataset. We can use them as:

someList.stream().forEach(System.out::println);Arrays.stream(someArray).forEach(System.out::println);