How do I create multiple abstract instances using a counter?

Question

Here is my code:

for (int i = 0; i < 40; i++)
{
     Button btn = new Button()
     {
         @Override
         public void click()
         {
             result = i;
         }
     };
     btn.setLocation(i * 30, 0);
     btn.setLabel("Option " + i);
}

However, since my button class is abstract, int i cannot be used because it is not listed as final . How do I enable the use of a counter in this scenario?

Thanks.

Answer 1

You can create a final variable from the non-final one:

for (int i = 0; i < 40; i++) {
  final int i0 = i;
  //etc. 

Note that with Java 8+ the final modifier is optional.