Create an Array of Functions in Java

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();
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