Question

Is it possible to have class A with an empty method say render().. then you create 3 instances of the class, so you have objects b, c, d, so can I THEN assign bodies for the render method for each object?

Here’s an example, in JavaScript you can have an object say a and then anywhere you can say

a.method = function() { /* do something */ }

After that line, you will have a method with the name method for the object a and whenever called it will /* do something */.

Is this possible in Java and what is the syntax?

My idea is to have a button class and assign different actions to it’s instance’s click method inside the different situations / context it is used, so I don’t have to define a different child class for each action.

Answer 1

You can annomyously instantiate a subclass of the A class and override the method you’d like in it. Like so

A a = new A(){
   @Override
   public void render(){
       //do something
   }
};
A b = new A(){
    @Override
    public void render(){
        //do something
    }
}