Interfaces are used as super classes whose properties are inherited by a class. Thats why it is necessary to create a class that inherits the given interface. This is achieved as follows

Example:

class ClassName implements InterfaceName
{
	Body of class
}
//The more general form of implementation is
												
class ClassName extends superclass implements Interface1,
Interface2........
{
	body of className
}

Here it represents that a class can extend another class while implementing interfaces
Let us see a program to understand this concept

Example:

interface Print
{  
	void display();
} 										  
class Printing implements Print
{
	public void display()
	{
		System.out.println("JavaRace");
	}
}
class InterfaceDemo
{
	public static void main(String args[])
	{
		Printing ob = new Printing();  
		ob.display();
	}												
}

Output

JavaRace

Multiple inheritance in Java by interface:

If a class implements multiple interfaces, or an interface extends multiple interfaces i.e. known as multiple inheritance.
Img Insert Here.
Let's see the following program:

Example:

interface Test1
{ 	
	void display();  								
} 												  
interface Test2 
{   			
	void show();   				
}   		  
class Simple implements Test1, Test2 
{  									  
	public void display(); 
	{ 		
		System.out.println("JavaRace");		
	} 											
	public void show()
	{ 													
		System.out.println("Silan Software");											
	}											 
}
class MultipleDemo 
{ 
	public static void main(String args[])
	{ 
		Simple s = new Simple();
		s.display(); 
		s.show();   
	}
}

Output

JavaRace
Silan Software

Note:

Multiple inheritance is not supported in case of class. But it is supported in case of interface because there is no ambiguity as implementation is provided by the implementation class.