[Shuyin]

Hello,

This is a lab question I'm unsure on.

I have a number of methods each performing a single operation on a number, for example : Switching a sign, applying a sine function or applying a square root.

If I wanted to perform something like the minus of the square root of a sine of a number then how would I replace all these methods with a single method which takes a parameter as a functor. I'm guessing the functor is another method with what we're applying to a number (like the example above)?

I could really do with some help here, thank you in advance :-)

Shuyin

[pbl]

Shuyin, on 3 Apr, 2008 - 05:50 AM, said:

Hello,

This is a lab question I'm unsure on.

I have a number of methods each performing a single operation on a number, for example : Switching a sign, applying a sine function or applying a square root.

If I wanted to perform something like the minus of the square root of a sine of a number then how would I replace all these methods with a single method which takes a parameter as a functor. I'm guessing the functor is another method with what we're applying to a number (like the example above)?

I could really do with some help here, thank you in advance :-)

Shuyin

Easy in C and C++ but not in Java. For security reason you do not want a malicious user or hacker to pass on a custom made function/method to another function expecting one of the standard functions/method.

As there is no arithmetic on pointers in Java there are no pointer to method in Java.

This post has been edited by pbl: 03 April 2008 - 06:12 AM

[1lacca]

The reflection API is your friend, and the Methodclass.

[bhandari]

but remember avoid reflection API as its behaviour effects the program at runtime. Not recommended for good commercial apps.

[1lacca]

Hahaha, back to school But this is Sparta!
Anyway, I am not really sure about the problem, but it seems to me that using some interfaces it could be solved without using method pointers.