Method reference is a shorthand syntax for a Lambda Expression In Java that contains just 1 method call. We are passing a function and not invoking a fucntion hence

  Object::method name

When to use ? Receiving an argument or parameter and you want NOT ALTER IT in anyway but let it PASS through.Use it as gluecode .

When NOT to use? If we want to perform operations on it then NOT usefule

public class Sample {
    public static void main(String[] args) {

	List<Integer> numbers= Arrays.asList(1,2,3,4,5,6,7,8,9,10);
	  System.out.println("Method refernce ");
	// We are passing a function and not invoking a fucntion hence ::
	//Method Reference
	numbers.forEach(System.out::println);
	}}

• Types of Method References

• Limiations of Method Reference