If your SoapPair class has any member variables, all of them have to be of a type that is serializable.

The panel class needs a reference to your frame class. Assuming your frame class creates the panels, the frame should send a reference to itself (this) as an argument to the panel constructor. You...

I would argue that the majority of code people write is iterative rather than recursive. Because recursion has more overhead in terms of memory and speed, iterative approaches are generally preferred...

The lowercase part you have actually won't work for all cases...

What I would do is just have a boolean variable for each condition, and each check will set the appropriate variable to true or...

And your question is?

Did I say I don't know how to build a GUI from scratch? What is wrong with using a tool that makes the GUI design process quicker?

I usually use Eclipse, but switch over to Netbeans when I do any sort of GUI.

The Java API is your friend: http://java.sun.com/javase/6/docs/api/
Look up FileWriter, look at the constructor and the write methods.

You will need nested loops. The inner loop will print one line of numbers, while the outer loop controls how the pattern changes for the inner loop.

If you're still stuck, try solving the problem...

Just 71C15 alone is over 914 trillion combinations. A normal computer can do about 1 billion/sec. This means it will take about 10 days to compute just 71C15.

You might be able to do 71C7 or 71C8...

Generally when you are doing recursion on any kind of collection of items (lists, arrays, even strings) you want to solve the problem for the first element of the collection, then recurse on the...

I think you're going to need to give more information about what you need to do.

Also try to reduce the amount of code you post. Just post the relevant parts. Add the exact error messages or example output to show us the problem.

What protocol do you want to simulate? At what layer? You should be able to code a simulation up depending on which protocol you want to simulate.

You might also want to do a search into network...

Sorting by hand generally means the teacher wants you to show the array after each step of the sort from start to finish.

You shouldn't ever be returning the operators though, only the result of operations or the number value in the node.

In the first branch, after you apply the operator to the two children, you...

Since you want to return a string, just save the string returned from each recursive call, plus the string of the data in the node you are looking at and add them all together:

public void...