Interfaces with Private Methods in Java

Write a Java program to demonstrate the concept of an interface with private methods

The MyInterface interface contains an abstract method abstractMethod(), a default method defaultMethod(), and a static method staticMethod().
Both the default and static methods use private methods privateMethod() and privateStaticMethod() respectively for code reuse and encapsulation.
We demonstrate calling these methods from an anonymous class implementing MyInterface and from the InterfaceWithPrivateMethodsDemo class.

Source Code

public class InterfaceWithPrivateMethodsDemo
{
	public static void main(String[] args)
	{
		MyInterface myObject = new MyInterface()
		{
			@Override
			public void abstractMethod()
			{
				System.out.println("Implementation of the Abstract Method");
			}
		};
 
		myObject.abstractMethod();
		myObject.defaultMethod();
		MyInterface.staticMethod();
	}
}
 
interface MyInterface
{
	void abstractMethod();// Public abstract method
 
	default void defaultMethod()// Default method using a private method
	{
		System.out.println("Default Method");
		privateMethod();
	}
 
	static void staticMethod()// Static method using a private method
	{
		System.out.println("Static Method");
		privateStaticMethod();
	}
 
	private void privateMethod()// Private method for default methods
	{
		System.out.println("Private Method used in a Default Method");
	}
 
	private static void privateStaticMethod()// Private static method for static methods
	{
		System.out.println("Private Static Method used in a Static Method");
	}
}

Output

Implementation of the Abstract Method
Default Method
Private Method used in a Default Method
Static Method
Private Static Method used in a Static Method

Interfaces with Private Methods in Java

Source Code

Output

Example Programs

Interface Programs in Java