java method reference code example

Example 1: java method

public class Main {
  public static void main(String args[]) {
    SayHi();
    
    int sum = AddNums(5, 6);
    System.out.println(sum);
  }
  
  public static void SayHi() { //This method has no return value
    System.out.println("Hi!");
  }
  
  public static int AddNums(int a, int b) { //This method has a return value
    return a + b;
}

Example 2: java method reference

Java provides a feature called method
reference in Java 8. Method reference 
is used to refer method of functional interface.
  It is compact and easy form
  of lambda expression. Each time when 
  you are using lambda expression to just
  referring a method, you can replace your
  lambda expression with method reference.

Types of Method References:
- Reference to a static method.  Syntax ==> ContainingClass::staticMethodName  
- Reference to an instance method.  Syntax ==> containingObject::instanceMethodName  
- Reference to a constructor.  Syntax ==> ClassName::new