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40 Visitor Messages

  1. View Conversation
    Hi, I'm kolo854.
    can you help me to take a look on my java problem?
    thanks..
  2. View Conversation
    hi my friend
    can u help me to doing my java assignment
    really its so hard i can't do this
  3. View Conversation
    Hello,

    i have installed tomcat 6.0, i am getting following error while running application.



    java.lang.NullPointerException
    org.apache.jsp.login_jsp._jspInit(login_jsp.java:2 3)
    org.apache.jasper.runtime.HttpJspBase.init(HttpJsp Base.java:52)
    org.apache.jasper.servlet.JspServletWrapper.getSer vlet(JspServletWrapper.java:159)
    org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:329)
    org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:342)
    org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:267)
    javax.servlet.http.HttpServlet.service(HttpServlet .java:717)

    regards,
    shakuntala
  4. View Conversation
    Corrrection:
    a+b should be (a+b), a+b*c should be (a+(b*c)), a+b*c/d will be (a+(b*(c/d))).

    For the toString().

    I think I'm recursively calling the toString() somehow.

    Any ideas of how to do it? I'm kinda strapped for time and also am very tired right now from an English project which will have to have a not-so-hot rough draft being turned in tomorrow. The programming one is due tomorrow at 11:59 p.m. but I have 3 classes tomorrow.

    All I think I need to get done now is the toString() and the buildTree().
  5. View Conversation
    I've figured that when there is only one operator left or something, see posts, then I'm to set that one as the root.

    But I don't quite know how to work the build tree method.

    I can say that somehow for the toString()

    a
    I get

    (a)

    (a + b)

    I get
    (a+b)

    for a*b + c

    I get ((a*b) + (c))

    for (a+b) / (c%d)

    I get

    ((a+b) / (c%d))
  6. View Conversation
    Please stop ignoring me!
  7. View Conversation
    Thanks very much I think I'll find something.
  8. View Conversation
    Cannot figure out what to do.
  9. View Conversation
    Dear copeg I wanna participate java projects as a volunteer. Do u have any ideas or do u know any sites where I can join?
Showing Visitor Messages 21 to 30 of 40
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About copeg

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About copeg
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Biologist by training, Computer Scientists at heart.
Location:
US
Java Skill Level:
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View copeg's Blog

Recent Entries

The Groovy in Java

by copeg on June 22nd, 2011 at 09:53 PM
Although scripting languages seem like dime a dozen, there is always that learning curve to become familiar (let alone an expert) with a new language. For those who are more familiar with java - enter groovy. Groovy is a powerful higher level language based upon java, making certain tasks trivial to accomplish relative to the low level java equivalent. The power of groovy comes into play in its ability to plug-into java, and be plugged into from java. Groovy can access class files and libraries,

Read More

Updated June 23rd, 2011 at 09:07 AM by copeg

Categories
Scripting

Logging

by copeg on May 30th, 2011 at 12:22 PM
Logging is a great method to monitor the progress of a program while at the same time maintaining flexibility to control the output. Simply put, logging is just printing out statements during the runtime of an application. In another blog I described a simplistic method for logging - using System.out.println. More advanced logging libraries however go beyond just printing to the console - their flexibility allows control of when, how, and where to log.

Many logging libraries exist,

Read More

Updated May 31st, 2011 at 07:32 PM by copeg

Categories
Debugging

The Monty Hall Problem

by copeg on May 16th, 2011 at 07:29 PM
The Monty Hall problem is a statistical problem which originates from the television Game show Lets Make a Deal, hosted by Monty Hall. The game is simple: a contestant is presented 3 closed doors, behind one of which is a valuable prize (oftentimes described as a car, whereas the other doors have goats behind them). A contestant chooses a door. The host then opens one of the doors you did not choose, which does NOT contain the prize. Then the host asks - do you want to change your decision? What

Read More

Updated May 16th, 2011 at 07:32 PM by copeg

Categories
Simulations

How and why an SSCCE?

by copeg on March 27th, 2011 at 10:21 AM
The term SSCCE gets thrown around a lot in online programming forums. Its a simple acronym that stands for Short, Self Contained, Correct Example. But what is so important about an SSCCE? For starters, creating an SSCCE provides a very simple example that clearly demonstrates a given problem, helping one receive help and advice much quicker. But it also goes far beyond just that. Often just the process alone of writing an SSCCE will unveil the problem at hand. But even more important, the process

Read More

Categories
Debugging

Debugging with System.out.println

by copeg on March 10th, 2011 at 11:29 AM
System.out.prinln is quite possibly the most useful debugging tool there is - especially for the beginner programmer with no knowledge of other tools such as debuggers, assertions, and/or loggers. System.out.println prints to the command line the values passed to the method as an argument (if an object is passed, the String returned by Object.toString() is printed). For debugging, this tool allows the programmer to evaluate a variable value at a certain position in the code. But that's only the

Read More

Updated March 11th, 2011 at 08:25 PM by copeg

Categories
Debugging