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Message:

Polymorphism: cannot be applied error

Posted by Bobby S. on July 27, 2001 at 3:52 PM

I get a compile time error when I compile the following class "Interrogator" which is an application and also has the method which accepts an Interface "Talkative", I haven't been able to come up with a good reason for the below error, can someone throw some light?

javac Interrogator.java
Interrogator.java:11: letsMakeItTalk(Talkative) in Interrogator
cannot be applied to (Cat) Interrogator.letsMakeItTalk(c);

---code follows

interface Talkative{
void talk();
}

abstract class Animal{
public void talk(){
}
}

class Cat extends Animal{
public void talk(){
System.out.println("meow meow");
}
}

class Interrogator{
static void letsMakeItTalk(Talkative subject){
subject.talk();
}

public static void main(String[] args){
Cat c = new Cat();
Interrogator.letsMakeItTalk(c);
}
}

• Implement Talkative interface to Cat class Kishori Sharan July 27, 2001 at 4:00 PM (5)
  • Re: Implement Talkative interface to Cat class Bobby S. July 27, 2001 at 7:21 PM (4)
    • Makes sense to me Kishori Sharan July 27, 2001 at 8:09 PM (3)
      • CLASSPATH problem... Bobby S. July 27, 2001 at 9:01 PM (1)
        • I agree Kishori Sharan July 27, 2001 at 9:36 PM (0)
      • Re: Makes sense to me Bobby S. July 27, 2001 at 8:39 PM (0)