Answer Posted / guest

1. Suppose interface interfaceDemo.java is as below

interface interfaceDemo {
public void methodA();
public void methodB();
}

2. Suppose class InterfaceDemoMain.java is as below

class InterfaceDemoMain implements interfaceDemo {
public void methodA() {
System.out.println("Inside methodA");
}

public void methodB() {
System.out.println("Inside methodB");
}

public void methodC() {
System.out.println("Inside methodC");
}

public static void main(String[] ar) {
InterfaceDemoMain idm = new InterfaceDemoMain();
interfaceDemo id;
id = idm;
id.methodA();
id.methodB();
id.methodC();// error
idm.methodC();
}
}

3. Here id.methodC(); will give error, only methods declared
inside interface are accessible to interface reference.

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