Java Forum RSS Feed (Replies Included)

not displaying image

Thu, 19 Nov 2009 07:30:20 -0700

hey folks, I really do need some help with this one. All I'm trying to do is display an image to my oanvas on a mobile handheld running WM5 os.

ITS NOT WORKING!

I run my app on my laptop through everything works and shows up okay. When I exported to a .jar file from Eclipse, I uploaded it to my device where I have a JVM.

Am I missing any something here? Would I need another JVM or something?

-=The Best Has Yet To Come=-

Can you figure out whats wrong with my RPN calculator?

Wed, 18 Nov 2009 18:57:55 -0700

Im trying to implement a node based stack. The class RPN is a calculator where the arguments precede the operators. EG:

input: "25 54 +"
output: 79

input "2 25 54 + * "
output: 158

;-------------------------

import java.util.Random;

class SLNode
{
SLNode next; // the next node in the chain
Object element; // the element itself

SLNode(Object e, SLNode n)
{
element = e;
next = n;
}
}

class StackLab
{

SLNode stack; // chained list of SLNodes
int size; // number of elements in the stack

StackLab()
{
stack = null;
size = 0;
}

public boolean push(Object element)
{
stack = new SLNode(element, stack);
size += 1;
return true;
}

public Object pop()
{
if(size == 0)
return null;

Object element = stack.element;
stack = stack.next;
size -= 1;
return element;
}

public Object peek() {
if(size == 0)
return null;
else
return stack.element;
}

public int size()
{
return size;
}

}

class RPN
{
static public void main(String[] args)
{
StackLab stack = new StackLab();

while ( ! Console.endOfFile() )
{
String token = Console.readToken();

if(Tester.isNum(token) == true)
{
stack.push(token);
}

else if(token == "+")
{
int x = (int) (Integer) stack.pop();
int y = (int) (Integer) stack.pop();

int tempResult = x + y;
stack.push(tempResult);
}

else if(token == "-")
{
int x = (int) (Integer) stack.pop();
int y = (int) (Integer) stack.pop();

int tempResult = x - y;
stack.push(tempResult);
}

else if(token == "/")
{
int x = (int) (Integer) stack.pop();
int y = (int) (Integer) stack.pop();

int tempResult = x / y;
stack.push(tempResult);
}

else if(token == "*")
{
int x = (int) (Integer) stack.pop();
int y = (int) (Integer) stack.pop();
int tempResult = x * y;
stack.push(tempResult);
}
}

assert stack.size() == 1;
int result = (int) (Integer) stack.pop();
System.out.println(result);

}
}

;---------------------------------------

At the moment, the program produces no output when the string is entered from the console. When it is entered from a file, It just prints the second number entered, on its own.

Any help is much appreciated. Thanks.

Can you figure out whats wrong with my RPN calculator?

Wed, 18 Nov 2009 18:56:08 -0700

Re: what wrong with my java code

Wed, 18 Nov 2009 17:04:06 -0700

i just remove return from familySize () but foraverageFamilyAge() it not correct

Re: what wrong with my java code

Wed, 18 Nov 2009 15:07:13 -0700

Hi,

remove the return statements from the body of the for loops.

Best regards

over

what wrong with my java code

Wed, 18 Nov 2009 11:46:20 -0700

////////////////////////////////////////////////// ////////////////////////////////////////////main// ////////////////////////////////////////////////// //////////////////////////////

package question2;
public class Main{
public Main(){
}
public static void main(String[] args){
Person grandchild1 = new Person("a", 2, new Person[0]);
Person grandchild2 = new Person("b", 3, new Person[0]);
Person grandchild3 = new Person("c", 7, new Person[0]);
Person grandchild4 = new Person("d", 5, new Person[0]);
Person grandchild5 = new Person("e", 4, new Person[0]);
Person child1 = new Person("f", 35, new Person[]{grandchild1, grandchild2, grandchild3});
Person child2 = new Person("g", 28, new Person[]{grandchild4, grandchild5});
Person me = new Person("h", 53, new Person[]{child1, child2});
Person neighbor = new Person("x", 9999, new Person[0]);
System.out.println("My family size: " + me.familySize());
System.out.println("My family\\\'s average age: " + me.averageFamilyAge());
}
}
////////////////////////////////////////////////// ////////////////////////////////////////////////// ////////////////////////////////////////////////// /////////////////////////////////

////////////////////////////////////////////////// ////////code////////////////////////////////////// ////////////////////////////////////////////////// /////////////////////

package question2;
public class Person
{
private String name;
private double age;
private Person[] children;

public Person(String name,double age,Person[] children )

{
this.name=name;
this.age=age;
this.children=children;
}

public int familySize ()
{
int familycount=0;
if(children==null)
{
return 1;
}
else
{
for(int i=0;i<children.length;i++)
{
return familycount=familycount+children[i].familySize();
}
}
return familycount+1;
}
public double averageFamilyAge()
{
double avgage=0;
if(children==null)
{
return 1;
}
else
{
for(int i=0;i<children.length;i++)
{
return avgage=avgage+children[i].averageFamilyAge();
}
}
return avgage;
}
}
////////////////////////////////////////////////// ////////////////////////////////////////////////
the result should be

My family size: 8
My family's average age: 17.125

but i got
My family size: 1
My family's average age:0.0

Question about Code

Mon, 16 Nov 2009 09:31:04 -0700

Is there any way in Java to read in data, and then send export that data into other documents (such as a word document, EXCEL spreadsheet, etc.).

If not, what language(s) would be beneficial to use to complete such a task?

Thank you very much for your help.

Better integration solution of Web reporting tool

Sun, 15 Nov 2009 17:46:35 -0700

Background
Report development is only a part of application program, therefore, the integration of Web reporting tool is of great importance.

All the traditional Web reporting tools provide an independent report server without exception. With an independent report server, the application architecture is shown below:

The disadvantages of an independent report server:
● The independent report server communicates with application program via network protocol, and this degrades system performance seriously.
● It is unable to use all the advantageous functions of application server, such as the cluster capability, the management capability of connection pool, etc.
● Report server has an independent management mechanism of user permissions, which can not adapt the requirements of particular user role management from various industries and applications. It is insufficient, while it force application program to obey its rules.
● With too few APIs and weak control, it is hard to integrate.

Solution
RAQ Report is a professional Web reporting tool.
As a pure Java reporting software, RAQ Report provides integration as Jar package to programmers. Without independent report server, application infrastructure, and independent management mechanism of user permissions, RAQ Report can help programmers to implement integration conveniently. Its application architecture is shown below:

The advantages of no independent report server:
● The server of RAQ report is submitted as Jar package or application of application server. Therefore, it can get integrated with application program seamlessly to achieve the peak operating efficiency.
● Share the cluster capability and the management capability of connection pool of application server.
● Make unified deployment. Use the user role management mechanism of Web application directly to avoid the incompatible problem of two management mechanisms. Provide a unified login screen, and end users need not to log in twice.

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Sat, 14 Nov 2009 22:50:14 -0700

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need help for string

Fri, 13 Nov 2009 20:15:40 -0700

I need to write a program that first asks the user to enter a word (any word), read as a String. The program should keep asking for a word until the user enters -1 (also read as a String).

For example:
Please enter a keyword (enter -1 to exit): hello
Please enter a keyword (enter -1 to exit): HELLO
Please enter a keyword (enter -1 to exit): goodbye
Please enter a keyword (enter -1 to exit): -1

need help for string

Fri, 13 Nov 2009 20:14:07 -0700

Analyse the error of database connection factory in report development

Fri, 13 Nov 2009 17:30:44 -0700

Problem
For the users of web report tool, when developing web report, they need to configure dataset at first. When data source is complicated, they often want do some special handling to dataset. With the dataset factory listener class of RAQ Report, they can realize this idea.

However, users may meet a few problems in the use of dataset factory listener class. Next, we will introduce the common problems to help users to develop web report correctly with RAQ Report.

Error information
Error code 500 Message: : Failed to generate dataset factory: com.runqian.report4.dataset.SQLDataSetFactory Error source: : In dataset ds1, datasource report/core_epm is setted falsely or not running, please check data source: Abnormity: : Failed to generate dataset factory: com.runqian.report4.dataset.SQLDataSetFactory Error source: : In dataset ds1, datasource report/core_epm is setted falsely or not running, please check data source: at com.runqian.report4.model.CalcReport.calcDataSet(U nknown Source:317) at com.runqian.report4.usermodel.Engine.calc(Unknown Source:96) at ep.verify.expression.VerifyExpression.reportExpres sionCalc(VerifyExpression.java:57) at ep.commons.init.InitShowReportParams.verifyReport( InitShowReportParams.java:63) at ep.commons.init.InitShowReportParams.(InitShowRepo rtParams.java:43) at org.apache.jsp.reportJsp.showReport_jsp._jspServic e(showReport_jsp.java:68) at org.apache.jasper.runtime.HttpJspBase.service(Http JspBase.java:133) at javax.servlet.http.HttpServlet.service(HttpServlet .java:856)

Possible Reasons
1. Check the contxet of public void beforeCreated method which is setted to the IDataSetFactoryListener interface. If there is only connection in it, you’d better to set dataset factory. Then, if the connection in context is closed, data can be got from dataset factory.

2. Print connection. If it isn’t empty, the reason may be that datasource is configured repeatedly. If data source information is configured in reportConfig.xml before, users are not allowed to configure it in custom codes again. Or else, it will report error. To solve the problem, users only need to delete those configuration codes.

This post is from freezea's blog. You are welcomed cc it anywhere, and please indicate the source.

If you would like to read more articles about reporting tool, you are also welcome to refer to my blog.

Learning JAVA

Fri, 13 Nov 2009 12:08:18 -0700

Learning JAVA is a very hard thing, but it is a valuable discipline, we must strive to learn it.

Learning JAVA

Fri, 13 Nov 2009 12:06:31 -0700

Learning JAVA is a very hard thing, but it is a valuable discipline, we must strive to learn it.

Window Mobile 5.0

Fri, 13 Nov 2009 09:25:15 -0700

trying to get some simple things working under a WM 5.0 environment, but all my attempt are null.

How can I display an image!! so simple its crazy how it doesn't show. I tried jpg/gif/png/bmp formats, changing size from 200px to 100px, and I tried placing image on another JPanel before placing on my main JPanel. Nothing I've done worked.

Any apparent ideas?

-=The Best Has Yet To Come=-

Re: help pliz

Fri, 13 Nov 2009 02:56:46 -0700

want to convert blu rays to some common videos like AVI, ASF, MPEG, MP4, WMV, MKV, MOV, FLV, SWF, RM, 3GP, AAC, AC3, MP3, etc, just try blu ray converter right now!!!
also you can view the following software i recommended as belows:
mts converter mac

hd video converter

help pliz

Fri, 13 Nov 2009 02:35:13 -0700

how can develo an application that allows students to open up an account?the account must have university name,telephone number,course name and faculty name.pliz hel me out.

Re: Eclipse @Override problem

Thu, 12 Nov 2009 13:38:56 -0700

any luck getting an answer...I'm having the same problem.

Re: help - string

Thu, 12 Nov 2009 07:14:36 -0700

You can't compare diferent types, like a string and int.
You sould convert the int value -1 to a string value "-1", and
use the comparable string method, never use the logic operators:
==,
!=
Use instead:
<String>.compareTo(<String>);

help - string

Wed, 11 Nov 2009 20:22:30 -0700

I am trying to write a program that first asks the user to enter a word (any word), read as a String. The program should keep asking for a word until the user enters -1 (also read as a String).

This is my code, but it says "incomparable types: java.lang.String and int"

System.out.print("Please enter a keyword (enter -1 to exit): ");
for (String word = input.nextLine(); word != -1; word = input.nextLine()){

System.out.print("Please enter a keyword (enter -1 to exit): ");

Re: Some help required, this isn't homework

Wed, 11 Nov 2009 07:46:52 -0700

thanks

search engine marketing service

Re: Retry JButton blocks repaint()

Tue, 10 Nov 2009 08:13:16 -0700

Hi,

I think problem may be related to threading.......

I found few cool examples at http://www.sourcecode3s.com/Cate_list.aspx?catid=6

hope may help you...

Thanks.

Re: Problem with JFrame Painting

Tue, 10 Nov 2009 08:11:42 -0700

Hi,

I found few cool examples at http://www.sourcecode3s.com/Cate_list.aspx?catid=6

hope will help you...

Thanks.

Re: Please Help me on Linked List- Urgent

Tue, 10 Nov 2009 08:10:32 -0700

Hi,

I found few cool examples at http://www.sourcecode3s.com/Cate_list.aspx?catid=6

hope will help you...

Thanks.

Scanner class = scn.next()

Mon, 09 Nov 2009 20:22:24 -0700

Hi there,
I am supposed to do a randomization of questions and the user answer them.

An example would be what does IE stands for:
the user must enters Internet Explorer. and it's correct.

However, in my programme, whenever the user enters "Internet Explorer" or any other string that has space, my program could not detect the correct answer. and it will loop 2 times depending on the String after the space the user entered. Example, Internet Explorer will loop 2 questions out.

Here is my source codes:

System.out.print("Ans: ");
     answer = scn.next();
  for (int num = 0; num < array.length; num++)
  {
  if (answer.toLowerCase().equals(array[num])
  {	
       accPoints += 20;
   System.out.println("Correct! You have " + accPoints + " points now!");
                     
 }
else 
 {
correct = false;
if (num ==0)
System.out.println("Incorrect! The answer is [" + array[num])+ "]");
}
}