I saw a code in java 8 to iterate a collection.
List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6);
numbers.forEach(System.out::println);
What is the functionality of System.out::println ? And how the above code can iterate through the List.
And what is the use of the operator :: , Where else we can use this operator ?
It's called a "method reference" and it's a syntactic sugar for expressions like this:
numbers.forEach(x -> System.out.println(x));
Here, you don't actually need the name x in order to invoke println for each of the elements. That's where the method reference is helpful - the :: operator denotes you will be invoking the println method with a parameter, which name you don't specify explicitly:
numbers.forEach(System.out::println);
:: operator ?
