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Using JOptionPane to get input is pretty simple:


String input = JOptionPane.showInputDialog("Enter a number");
int number = Integer.parseInt(input);

That's your input routine for reading in...

In terms of this example, no, there shouldn't be any huge performance difference. The Scanner class is actually a new class that they added to the latest version of Java. I'm guessing many course's...

That is most likely happening because you're storing the data as String's. Instead, convert it to integers using Integer.parseInt() before adding it to the ArrayList:


BufferedReader inReader =...

I assume you mean the curly braces ({}). In the code snippet you posted, they mean initialize the array with the following values.

An interface is sometimes called an "ultimate abstract class" because it (usually) contains nothing but implicit abstract methods. In general, an interface defines a set of behaviors for class's that...

For sorting, try http://en.wikipedia.org/wiki/Sorting_algorithm and http://linux.wku.edu/~lamonml/algor/sort/

The 2nd link contains code in C though, but it's very similiar to Java.

A RuntimeException like ArrayIndexOutOfBoundsException generally means your code is flawed and has a bug.

Every array has a length field that you can use to check the index against:


int i =...

It can get a little confusing, some of the explanations out there are unfortunately not very clear about what they're referring to. The links below should help you out a bit.
...

This would depend on the implementation, if you do a linear seach going towards the first element to find the insertion point, then yes, if you do a binary search, then no.

The first step of constructing the heap can be done in linear time. The second operation of putting the elements in place would take O(n*log(n)).

Keep this in mind about sorting algorithms and...

So you want to do a linear search through the ArrayList to search for 2 String values. There's no need to code an explicit loop to search through the List since the code is already given to you in...

There's an option, when you install the J2SE SDK, to also include the source code for the Java library during installation. After installation, open the zip file called src.zip in the folder where...

Here's a page with some info about the String literal pool: http://www.javaranch.com/journal/200409/ScjpTipLine-StringsLiterally.html

operator<< is a function, the order of evaluation for function arguments are undefined: http://www.research.att.com/~bs/bs_faq2.html#evaluation-order

If you want to know why your compiler is...

Not exactly, ArrayList's get() method runs in constant time (http://java.sun.com/j2se/1.5.0/docs/api/java/util/ArrayList.html). Using a linked list just because you need extra space would violate...

There's also Boost Variant and Boost Any with included usage examples.

LinkedList's don't support the notion of constant-time random-access. This means that in order to access any element in the linked list, there's code that has to traverse the list until it comes to...

How about using something like a List, and calling toArray() when needed? A List container, like an ArrayList, will take care of all the internal array management.


List lst = new ArrayList();...

Are you saying you add 3 items to the HashMap and can only examine 2 when you iterate through it? Or are you just basing this on what the debugger is showing you?

If it's the first one, then...

There are a few old forum posts that deals with transferring data over sockets, such as: http://www.codeguru.com/forum/showthread.php?t=283663

Transferring data over a network is not that much...

The Java Tutorial happens to have a few examples: http://java.sun.com/docs/books/tutorial/networking/index.html

First, use the proper algorithm, search() is used to find subsequences: http://www.sgi.com/tech/stl/search.html
find() is what you're looking for when searching for 1 element:...

Here's Stroustrup's FAQ entry about static_cast:
http://www.research.att.com/~bs/bs_faq2.html#static-cast

http://www.codeguru.com/forum/showthread.php?t=284510&highlight=sorting+hashmap

Here's an online text on compiler theory that use's C++: http://www.scifac.ru.ac.za/compilers/

Another book you may want to look into is Writing Compilers and Interpreters