Create an Array of Functions in Java

Java doesn’t offer direct support for pointer to functions. But this doesnot mean that you cannot have a set of functions that can be accessed via amapping index. The code below shows you how to create an array of functions.

First you’ll need a generic Interface like:

        public interface Function       {          public void runFunction();       }

Then, you can have a variety of classes that implement this interface in their own way:

        class Function0 implements Function        {            public void runFunction()            {               System.out.println("Function 0 ececutes: ...");           }        }       class Function1 implements Function        {            public void runFunction()            {               System.out.println("Function 1 ececutes: ...");           }        }

Now you just create instances of your classes and place them in an array:

          Function[] funcArray = new Function[2];         funcArray[0] = new Function0();         funcArray[1] = new Function1();

And, finally, to execute:

          funcArray[0].runFunction();         funcArray[1].runFunction();