Java Interface methods

There is a rule that every member of interface is only and only public whether you define or not. So when we define the method of the interface in a class implementing the interface, we have to give it public access as child class can’t assign the weaker access to the methods.

// A Simple Java program to demonstrate that 
// interface methods must be public in  
// implementing class 
interface A 
{ 
    void fun(); 
} 
  
class B implements A 
{  
    // If we change public to anything else, 
    // we get compiler error 
    public void fun() 
    { 
        System.out.println("fun()"); 
    } 
} 
  
class C 
{ 
    public static void main(String[] args) 
    { 
        B b = new B(); 
        b.fun(); 
    } 
} 

Output:

fun()

If we change fun() to anything other than public in class B, we get compiler error “attempting to assign weaker access privileges; was public”

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