hello. I would like to know how I can make out a Java code from a given mathematical equation like differentiation equations, summation and integration

You need to understand the logic of those equation first and use the javadocs (api) to help you with the functions available to solve mathematical problems.

Ofcourse I can get to understand the logic..What I want to know is how i can get, say a given equation to integrate or differentiate a number, then change that logic, to JAVA code..is there any application or tool that can do this?

Probably, do a google search for them. If you're talking about simple differentiation and integration (i.e. power rule) then it is trivial anyway, and so is chain rule for differentiation. Why don't you mention the specific formula you're trying to code and then show some progress or ideas etc on it.

Ofcourse I can get to understand the logic..What I want to know is how i can get, say a given equation to integrate or differentiate a number, then change that logic, to JAVA code..is there any application or tool that can do this?

Depends on the equation. A lot of equations are done for you and are included in Math.

Some equations you'll have to write out or combine with Math functions.

double x = 0.5;
double y = Math.cos (x) + Math.pow (theta, 1.5) - 2 * x + 6.3;

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And Math is just one of many classes you can use. There is all sorts of stuff out there, both from Sun and from individuals who have posted work.
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Pls, can anyone tell me how to design and implement an application that computes and prints the mean and standard deviation of
a list of integers x1 through xn. Assume that there will be no more than a maximum of 50 input values. Pls, I am new Object Oreiented Program student.

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So here is my problem laid out as simple as I can put it.
I cant combine multiple entities together that have related data but are different
(one database table ...