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Type: Posts; User: cma

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  1. Replies
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    Re: Simple Addition Progs

    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...
  2. Thread: ArrayList Sorting

    by cma
    Replies
    4
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    1,593

    Re: ArrayList Sorting

    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...
  3. Thread: ArrayList Sorting

    by cma
    Replies
    4
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    1,593

    Re: ArrayList Sorting

    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 =...
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    Re: what does this mean? new String() {...}

    I assume you mean the curly braces ({}). In the code snippet you posted, they mean initialize the array with the following values.
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    Re: defination of interface,abstract

    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...
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    Re: searching and sorting

    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.
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    Re: How to check Exceptions while running

    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 =...
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    1,892

    Re: java is pass by refference or value

    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.
    ...
  9. Thread: heapsort

    by cma
    Replies
    7
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    2,049

    Re: heapsort

    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.
  10. Thread: heapsort

    by cma
    Replies
    7
    Views
    2,049

    Re: heapsort

    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...
  11. Replies
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    Re: and statement for a for loop

    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...
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    Re: Basic question on random

    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...
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    8,329

    Re: what is string pooling

    Here's a page with some info about the String literal pool: http://www.javaranch.com/journal/200409/ScjpTipLine-StringsLiterally.html
  14. Replies
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    3,911

    Re: What is the Output of this program?

    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...
  15. Re: What's the difference between LinkedList and ArrayList?

    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...
  16. Thread: void* in a struct

    by cma
    Replies
    26
    Views
    1,840

    Re: void* in a struct

    There's also Boost Variant and Boost Any with included usage examples.
  17. Re: What's the difference between LinkedList and ArrayList?

    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...
  18. Thread: Arrays

    by cma
    Replies
    1
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    743

    Re: Arrays

    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();...
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    Re: HashMap replaces pair key/value, why?

    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...
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    Re: Java and sockets help

    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...
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    Re: Java and sockets help

    The Java Tutorial happens to have a few examples: http://java.sun.com/docs/books/tutorial/networking/index.html
  22. Re: How to use find() to find a struct member in vector?

    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:...
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    Re: Casting:types and advantages

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

    http://www.codeguru.com/forum/showthread.php?t=284510&highlight=sorting+hashmap
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    Re: graduation thesis help on compiler.

    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
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