There is a class A which has an undefined method called OnEvent. I want this method to be define by the class that instantiates a class A Object.
Like this:
public class A{
int someVar=1;
float anotherVar=2;
public void method1(){
...
if( event )
OnEvent();
...
}
//OnEvent is not defined!!
OnEvent();
}
And another class, in a different package:
public class B{
A objA = new A();
public void method1(){
//I need to do something like
objA.setOnEvent( this.OnEvent() );
}
OnEvent(){
//Do something
}
}
I've looked this up and Interfaces and/or lambda expressions are the way to implements this, but I have been unable to do it successfully. Could you please provide some pointers on how to do so?
You can make the A class abstract (and the OnClick() method abstract, too)`.
Then, you can create anonymous instance(s) of A, with directly providing an implementation for OnClick().
For example:
public abstract class A{
...
public abstract void OnEvent();
}
public class B{
A objA = new A() {
public void OnClick() {
//OnClick implementation
}
};
...
}
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