Question

interface iMyInterface {
    public iMethod1();
}

public class cMyClass implements iMyInterface{
    public iMethod1() {
        System.out.println("From Method1");
    }
    protected iMethod2() {
        System.out.println("From Method2");
    }
}

class AppMain
{
    iMyInterface i=new cMyClass();
    public static void main(){
    i.iMethod1();
    ((cMyClass)i).iMethod2();
    }
}

this produce output as follows

From Method1

From Method2

becoz interface object is casted to that class

but my question is i cannot cast in this following case

class AppMain
{
    iMyInterface i=new cMyClass();
    public static void main(){    
    i.iMethod1();
    this.((cMyClass)i).iMethod2();
    }
}

Eclipse IDE shows following error:
Syntax error on token “.”, Identifier expected after this token.

i don’t understand this
in either way i accessing the same field.

Answer 1

You’re just casting at the wrong point. You want:

((cMyClass) this.i).iMethod2();

Not that you have a this to refer to in a static method like main in your example…

(Also note that none of your types etc follow Java naming conventions…)