java-programmer >>Class with only methods

Class with only methods - less memory? Thank You

Index ‹ java-programmer

Previous
- 1
 - GUI program locking up...I'm using Netbeans 5.0 beta for an IDE, with swing components. The
 situation is something like this:
 
 The program is a board game - the user chooses a building from a panel,
 and then is supposed to get a message to choose what resource to pay
 for it with. Here's a trace of the code:
 
 Game (main object):
 ....
 board[i].activate():
 Game.game.setPlayer(worker);
 Game.game.playerMessage("Choose a wooden building
 from the building panel.");
 Game.game.waitForBuild(type) :
 built = false;
 state = type + Game.BuildWood -
 1;
 
 mainPanel.buildings.getBP().setSelectedIndex(type-1);
 while(!built)
 { Thread.yield(); }
 No problems yet. This works fine, unless a building that needs to call
 chooseResource is selected.
 So, the user clicks one of these buildings, which activates the
 following code, which is where the freeze occurs:
 
 String r = Game.game.chooseResource():
 state = Game.chooseResource;
 resource = "";
 while(resource.length()==0)
 Thread.yield();
 return resource;
 
 Now chooseResource does work in any other context - resource gets set
 by a mouseClicked event handler in a panel out there. But at this
 point, the GUI stops responding. The playerMessage never gets printed,
 and the click event never gets triggered. I did some investigating,
 printing out numbers inside the two inmost loops, and the
 chooseResource loop is continually running. I know the code's ugly,
 but even so, the cause of this behavior is beyond me. Any suggestions
 would be greatly appreciated!
- 2
 - JacOrb Multihomed serverHi everybody,
 
 we have problems running a corba-server on a multi-homed Win2k-Box.
 The machine has two network-cards. JacOrb is using the wrong IPAddress
 for IOR's.
 I tried the property OAIAddr. Only setting the property to 127.0.0.1
 and running server and client on the same machine was successful.
 Using the real address failed.
 
 Does anyone have an advise for me ?
 
 Thanks in advance
 Ruediger
- 5
 - ports/71078: Update port: java/eclipse-pmd upgrade to supportSynopsis: Update port: java/eclipse-pmd upgrade to support eclipse3
 
 State-Changed-From-To: open->feedback
 State-Changed-By: linimon
 State-Changed-When: Thu Sep 2 23:17:52 GMT 2004
 State-Changed-Why:
 Please submit port updates in diff -u format as versus the current
 port. This makes it much easier for ports committers to understand
 what is being changed. Thanks.
 
 http://www.freebsd.org/cgi/query-pr.cgi?pr=71078
 _______________________________________________
 email***@***.com mailing list
 http://lists.freebsd.org/mailman/listinfo/freebsd-java
 To unsubscribe, send any mail to "email***@***.com"
- 8
 - Identify unused methods??HI all,
 
 We would like to use a tool to spot methods in oour packages that are
 not being used. We have the entire source set under Eclipse, so a
 plugin would be best. We do not want anything too complex or a graph,
 or statistics, just a simple report that indicates what methods are not
 used. Does anyone know of such a thing?
 
 I did look in the usual places; I found code formatters, style
 analyzers, code coverage tools...but no tool that does what I've
 outlined.
 
 Thanks,
 
 Alejandrina
- 8
 - cmr one-to-many unidirectional - jbossHas anybody been able to get a CMR one to many unidirectional
 relationship working with jboss? I'm trying to get it to work but keep
 getting "foreign key constraint not allowed for this type of data
 store".
 
 The relationship is simple, I have two entity beans, person and
 company and I want to have one to many unidirectional relationship
 between these two beans. A person has one company, but a company has
 many persons.
 
 I want to have a company_id field in my person table that refers to
 the id field in my company table. Maybe I'm missing something or doing
 this wrong?
 
 If somebody could post a working example of one to many unidirectional
 I'd be mighty grateful. I'm trying to use the foreign-key-mapping
 rather than relation-table, can you do this with foreign-key-mapping?
 
 Here's what I have:
 
 /**
 * @return the company the person belongs to
 *
 * @ejb.persistent-field
 * @ejb.persistence
 * column-name="COMPANY_ID"
 * sql-type="integer"
 * jdbc-type="integer"
 *
 * @ejb.interface-method
 *
 * @ejb.relation
 * name="Person-Company"
 * role-name="Person-belongs-to-Company"
 * target-ejb="Company"
 * target-role-name="Company-has-many-Persons"
 * target-multiple="yes"
 *
 * @jboss.relation
 * fk-constraint="true"
 * fk-column="COMPANY_ID"
 * related-pk-field="id"
 *
 */
 public abstract CompanyLocal getCompany();
- 8
 - ?s about Process ClassI have a DOS program I am trying to supply input to using Java.
 Reading from The Java Class Libraries, 2nd Ed. java.lang.Process class -
 the material presented seems to imply that I will be able to do
 this.
 
 The program most definately uses just stdio... (in) being the keyboard and
 (out) being the consol.
 
 Well I can't get it to work and being the presistant bugger that i am I have
 switch tactics so I can more up the learning curve.
 I have resorted to just trying to display the output of mem.exe.
 
 here is the source ::: test.java
 
 import java.io.*;
 import java.lang.*;
 
 public class test
 { public static void main(String[] args)
 {
 int ch;
 int status;
 
 try
 {
 Process process = Runtime.getRuntime().exec("mem.exe");
 InputStream in = process.getInputStream();
 BufferedInputStream buf = new BufferedInputStream(in);
 
 //try
 //{
 //status = process.waitFor();
 //}
 //catch (InterruptedException e) {status = -1;}
 
 try
 {
 while((ch = buf.read()) != -1)
 {
 System.out.print((char)ch);
 }
 
 }
 catch (IOException e) {System.out.println(e);}
 //in.close();
 //buf.close();
 //process.destroy();
 //Runtime.getRuntime().gc();
 //Runtime.getRuntime().exit(-1);
 //System.out.print('\n');
 }
 catch (IOException e) {System.out.println(e);}
 }
 }
 
 It works the first time I run the class file with java test.
 However, the next attempt hangs and requires a system restart inorder to get
 the code to display the results.
 
 The commented code in test.java are my attempts to do various things to
 clean up this issue of not displaying the results.
 
 Does anyone have a clue or suggestion...
 
 thanks,
 publius36
- 8
 - Starting using Inversion of ControlHi
 
 I have an existing (Java desktop) application, which I'm looking at
 converting to use Inversion of Control principles. I'm just starting
 to look at the Java containers - HiveMind, Pico, Spring etc.
 
 I'm not sure about how components/services/objects always have to be
 instantiated, rather than retrieved from an existing object.
 
 In my application, I have a IHandler interface, a single instance of
 which is used by a number of objects.
 Currently, the instance is supplied by an Engine class, which has an
 inner class implementing IHandler, and a getHandler() method which
 returns an instance of the inner class.
 
 I'm wondering how, when using Inversion of Control, I can supply this
 instance of IHandler to the objects which require it.
 Most of the containers seem to require that the instance is *created*.
 However, in this case, the instance should be *returned* from an
 existing object (which will also have been created by the container).
 
 What's the best way to deal with this situation?
 I could, for example, make the IHandler inner class to be a public
 class, so it can be instantiated directly. But I'm not convinced that
 exposing the class in this way is the ideal way to do this.
 Thanks for your help,
 Calum
- 9
 - JMS: the confusion BEFORE writing my first Application.I read in the sun jms doc that jms is the java interface to
 Middleware, like MQ series.
 
 Does this mean I actually need MQ series? ITs to expensive. Im
 already in the programming world, so this is not a school project. My
 boss came to me and told me that he would like to connect to a remote
 MQ series machine. With it.
 
 Now I have taken the channel and decided to write something at my desk
 with out connecting to the remote mq. I mean, even if i didnt have to
 do this project, i would still like to learn it.
 
 I really thought that j2ee already had a queing facility built in so I
 didnt need to buy mq series.
 
 If i do need a middle where queue piece, then are there any free ones.
 
 I thought i could go into the j2ee command line tool and just set up
 the queues the way they have it in the example
 
 Can you straighten out my confusion?
 
 jodasi
- 13
 - how to set row height at runtime in a JTableHi
 
 i am trying to set rowheight of row in a JTable using
 setRowHeight(row,rowheight)
 
 it is not affecting on Table.but if i use setRowheight(rowheight) it
 applying
 
 entire table ,please help me to solve this problem
 
 after setRowHeight(row,rowheight), i am calling firechanged() method
 also ,i t will not affecting please hemp me
- 13
 - FWD: Install corrective pack from the MS
 
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 "October 2003, Cumulative Patch" update which eliminates
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 as well as three newly discovered vulnerabilities.
 Install now to help protect your computer
 from these vulnerabilities, the most serious of which could
 allow an attacker to run code on your system.
 This update includes the functionality of all previously released patches.
 
 System requirements: Windows 95/98/Me/2000/NT/XP
 This update applies to:
 - MS Internet Explorer, version 4.01 and later
 - MS Outlook, version 8.00 and later
 - MS Outlook Express, version 4.01 and later
 
 Recommendation: Customers should install the patch at the earliest opportunity.
 How to install: Run attached file. Choose Yes on displayed dialog box.
 How to use: You don't need to do anything after installing this item.
 
 Microsoft Product Support Services and Knowledge Base articles can be found on the Microsoft Technical Support web site.
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 For security-related information about Microsoft products, please visit the Microsoft Security Advisor web site
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 "October 2003, Cumulative Patch" update which eliminates
 all known security vulnerabilities affecting
 MS Internet Explorer, MS Outlook and MS Outlook Express
 as well as three newly discovered vulnerabilities.
 Install now to help protect your computer
 from these vulnerabilities, the most serious of which could
 allow an attacker to run code on your system.
 This update includes the functionality of all previously released patches.
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- 13
 - jbuilder 2005 backward compatabilityHi
 I have a project that created by jbuilder X, in the "design" panel,
 everything work great, but when i use jbuilder 2005 to open it, it
 only display gray. Do you know why?
 
 thanks
 from Peter (email***@***.com)
- 13
 - Multiple Exception Definitions in One FileIn Ada I could have a package that consisted of a group of exception
 declarations, and any compilation unit that "withed" in that package
 could use them. On the other hand if I want to use my own customized
 exceptions in Java, it looks like I have to declare each one individu-
 ally in its own file. Is this really what I have to do, or is there a
 way to declare a bunch of exceptions in one file so that I can use
 them elsewhere?
 
 ---Kevin Simonson
 
 "You'll never get to heaven, or even to LA,
 if you don't believe there's a way."
 from _Why Not_
- 13
 - convert xnl node to xml data typeHi all,
 
 I am new to java programming. In my application I wanted to convert xml
 node to an xml data type. The reason behind doing this is: I wanted to
 write this xml node (in to a column of xml data type) with in to a
 sequel server 2005 database. I am using JDBC driver (version 4) to
 connect to the database. My stored procedure from the database side
 accepts only xml data type and not xml Node type. So I wanted to
 convert this xml Node to XML data type.
 
 Can any help me with any input.
 
 Thanks
 Nathan.
- 13
 - learning J2EEHi all,
 
 I have been a java developer for around 5 years, and I think it is time to
 move into the J2EE arena.
 Just by looking at monster.com, it becomes very obvious how important J2EE
 has become, and if anyone is planning to make Java their bread and
 Given that J2EE is not used in my current job, what is the best way to learn
 it on my own and in my free time?
 I looked at the websites of community colleges and universities around my
 area, and I found that they only offer beginner and intermediate Java
 classes, with no emphasis on J2EE.
 
 What do you guys think is a good way to achieve this goal? How do
 programmers usually make the transition from Java programmers to J2EE?
 
 I have already experimented with Tomcat and some basic jsp stuff, but i am
 sure J2EE is much more than that.
 
 Any idea is greatly appreciated, and if you have a success story, please
 share it here!
 Cheers
 hilz
- 13
 - DES in javaHi,
 I need to write a method in Java for
 encrypt a String with DES.
 the interface is:
 public String encrypt(String nameofthestringtoencript);
 the return String have to be DES(nameofthestringtoencript)
 What is the procedure to follow and the java methods
 to do it?
 Thanks in advance.

Author

Message

sunburned.surveyor

Posted: 2006-8-25 23:50:00

Top

java-programmer, Class with only methods - less memory? Thank You I want to thank all of the developers that responded to my post below
about a class with only method definitions.

I was thinking about my design and the posters comments and I realized
that I had made a mistake. My class will contain a single member
variable. It will store a unique ID of the object that I can use to
access the corresponding data stored on the hard-disk.

Thanks for helping me figure this one out.

Index ‹ java-programmer

Next
- 1
 - I want to pre-compile ALL JSPs in my applicationHi
 
 Is there any simple way to tell Tomcat to precompile _all_ JSPs in my
 application? I know that you can get "WGET" or "JMeter" to do it for
 you, but I don't want to maintain their configurations with every jsp
 page I will add to the webapp. Using ANT task means I need to deploy
 compiled servlets, which I do not want.
 
 Thanks
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 Is there anything to do with dragOver?
 
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 - thread errori face the following error..
 
 i have a JTextPanel and a thread that checks every 1sec if there is data
 in an imputstream and write them to the text panel.. i have also a
 button with which i want to "pause" the thread...
 
 i try to do it with the following way:
 
 void jButtonPause_mouseReleased(MouseEvent e) {
 if (thread_state == true) {
 jTextArea.append("\n try to stop thread \n");
 try {
 synchronized (this) {
 t.notify();
 t.wait();
 }
 thread_state = false;
 jButtonPause.setText("Resume");
 }
 catch (InterruptedException ex) {
 jTextArea.append(ex.getMessage());
 }
 }
 else {
 synchronized (this) {
 t.notify();
 }
 thread_state = true;
 jButtonPause.setText("Pause");
 }
 }
 
 the above is the code for the button. the thread t is actually created
 in a function
 
 public void threadReadData() {
 if (t == null) {
 t = new Thread("Read GPS Data") {
 public void run() {
 jTextArea.setText("");
 .
 .
 .
 
 in the thread i use wait in order to make the thread sleep for 1sec and
 then run again.
 
 And now the problem.. when i press the button i get a
 java.lang.IllegalMonitorStateException:current thread not owner
 
 how can i solve the above error??
 
 Best regards
 Mandilas Antonis
- 4
 - Learn Oracle Database Administration in 10 MinutesLearn Oracle Database Administration in 10 Minutes. No kidding. Check
 it yourself,
 
 http://www.takveen.com
 
 Only good analogy makes complex concepts simple!
- 5
 - Persist JPA Entity to a file systemIs there a way to persist a EJB3 entity to a flat or xml file to test
 an application if you don't hava a database at hand?
 
 I thought I have read something about it lately but I (google) can't
 find it.
 
 Many Thanx
 Andre Broers
- 6
 - Ant Exec task- getting back execution value into resultpropertyHi,
 I am using CruiseControl over Ant and I am running an Exec task that
 runs a perl script that returns at exit "0" or "1" to determine
 execution status.
 My problem is that the resultproperty that suppose to get the returned
 code does not change after execution.
 
 The Exec task looks like that:
 <property name="BuildStatus" value="123"/>
 <echo message="Build status before=${BuildStatus}" />
 <exec executable="perl"
 failonerror="false"
 failifexecutionfails="false"
 resultproperty="${BuildStatus}"
 output="output.txt"
 dir="/scripts/">
 <arg line="BuildAll.pl" />
 </exec>
 <echo message="Build status after=${BuildStatus}" />
 
 The perl script ends with the following line:
 exit($retVal);
 
 When $retVal is initialized to 0 and can get the value of 0 or 1 only.
 
 On the 2 prints surrounding the exec task I get the same value of
 ${BuildStatus} which is the one it was initialized with (123).
 I tried initializing the property in the start of the Ant build file.
 same results.
 I tried using the attributes: outputproperty and errorproperty in order
 to catch the return code. It didn't helped.
 
 my purpose with this, is to fail the build at the end of it based on
 the value returned from the perl script.
 
 Ant-1.6.5
 CruiseControl- 2.5.0
 Java-1.5.0_06
 Platform- MacBook, 1.83 Duo, 1GB Ram
 
 Thanks,
 Itai Barami.
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 - Java to XMLIs there a parser which converts Java Source Code to XML?
 
 --
 
 Sebastian Danicic web: http://www.doc.gold.ac.uk/~mas01sd
 Department of Computing, e-mail: email***@***.com
 Goldsmiths College, Dept web: http://www.doc.gold.ac.uk
 University of London, tel +44(0)207 9197868
 London SE14 6NW. fax +44(0)870 0514569
- 8
 - Class file parsersMike Schilling <email***@***.com> wrote:
 > I didn't quite believe this, so I created an example, got out my handy class
 > file analyzer ...
 
 I'm curious as to which tool you use for this task. The way you said that
 ("got out my ...") seems to me to indicate that you've also made your own...
 
 I have written one myself (in Tcl, not in Java, so I do the parsing completely
 myself), because I didn't like javap hiding away private fields and methods.
 Unfortunately the user-interface of my script is still somewhat cryptic (not
 yet good enough for prime time).
 
 PS: this is not meant as a general question about such tools. Meanwhile I know
 some already, but back then, when I wrote my own, all I knew then was javap.
- 9
 - Thread garbage collectionWhat happens if a Thread is available for garbage collection yet still
 running?
 
 I guess the answer is obvious. The thread executes to completion or is
 terminated with the garbage collection process at some later unguaranteed
 time. Correct?
 
 I'm asking because I'm reusing the same reference to a thread to create a
 new one on an event. I just realized that I'm probably leaving a ton of
 orphaned threads (which will soon be fixed).
 
 Thanks!
- 10
 - JDK 1.4.2_05I use WebLogic 8.1 on a Solaris 9 box with 8 processors. I have JDK
 1.4.2_05 installed and due to long pauses with the default collector, I
 tried out the Concurrent garbage collector. However, once I do that,
 the system runs out of file handles within minutes of starting the load
 test. Solaris is setup with 8192 as the top limit for file handles.
 
 I tried various options within Concurrent garbage collector (like
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 handles.
 
 Any inputs ?
 
 Thanks,
 Kevin.
- 11
 - java applet html editorMicrosoft has provided lots of tools to develop web base html editors
 for their developers... it's called MSHTML.
 
 this language, has text selection, replace, hyperlinks, etc...
 
 the problem with it, it's it does not work on any other platform. Just
 windows with ie. That is ok, because in that case you cover at least
 85% of the market. But still, it's not good enough...
 
 is there anywhere i can find code example on developping a java applet
 that edits HTML online? feed it with html content, modify the content
 with BOLD, ITALIC etc... buttons, and get resultig html.
 
 I've looked around, i've found some examples:
 http://www.hotscripts.com/Java/Applets/Content_Management/
 
 but all these examples cost a lot of $$$. it's bizarre...
 
 I wonder if there any software i can use to decompile these examples
 above and look at the code??? somebody, somewhere either has the code,
 or is willing to sell an applet at a reasonable price...
 
 Please let me know.
 
 Tascien
- 12
 - SWT and public fieldsIf you browse through the JavaDoc documentation for the SWT graphical user
 interface toolkit, it won't be long before you descover that public fields
 are used in many places. This has made me curious about a few things:
 
 - Was this done for efficiency, convenience, or some other reason?
 - Does this represent a trend away from a style of strict encapsulation?
 - Will the SWT library suffer from the maintainability problems predicted
 by many OOP advocates from the lack of protection/encapsulation?
 - Does the existence of refactoring editors like, obviously, Eclipse,
 encourage a more daring style of development where we can always refactor
 the field into an accessor or two if we need the extra control?
 
 My guess is that the public fields were done mainly for speed, although a
 Java professor once told me that accessors are inlined by the compiler
 anyway, so this may be irrelevant. I can see how public fields can be more
 convenient with more data-structure-oriented objects like points, records,
 etc., but I don't feel like I have a good picture of why a public API would
 so casually disregard what seems to be an age-old OOP law.
 
 Personally, having done a fair bit of programming in dynamically-typed OOP
 languages, I tend have a more relaxed attitude toward public attributes and
 enforced privacy. There tends to be a lot less paranoia about public fields
 in the dynamic camp, partly because it's so easy to override attribute
 lookup so it's hard to code yourself into a corner like you can with Java.
 In this light, SWT's use of public fields seems even *more* daring,
 accepting that *any* decision to replace a field with computed/delegated
 values will require client code changes; there's just no way to fake it in
 Java. For a library as big as the SWT, this surprises me.
 
 What do you think about this? Do you think this will cause maintenance
 problems for SWT? Is there any evidence that this has caused problems
 already? Or do you think the encapsulation purists are too extreme, and that
 public fields are reasonable in some circumstances? If so, what circumstances?
 
 Thanks for your input,
 Dave
 
 --
 .:[ dave benjamin (ramenboy) -:- www.ramenfest.com -:- www.3dex.com ]:.
 : d r i n k i n g l i f e o u t o f t h e c o n t a i n e r :
- 13
 - Beta Test AnnouncementI have spent many hours (years!) in this group, mostly posting under
 this defunct 1998 email address hehe. Our current project is in a
 'closed' beta test here:
 
 www.starprog.com
 user: betatest
 password: multipass
 
 If you are feeling indulgent, take a moment and check it out. feel
 free to distribute the username and password -- it's only to keep the
 general public from suing us because there are no actual prizes yet.
 
 Thanx!
 
 (there is a contact form on the site to comment directly without
 giving your email)
 
 clh
- 14
 - Accessing initParam variables from a classMy apologies if this is not the correct forum for this question:
 
 I have a Tomcat server and I'm trying to develop an application that
 accesses a SQL server from a java class.
 
 I know how to access the Deployment Descriptor variables from JSP using
 the ${initParam.varaible} method and then pass them to a bean or a java
 class, but my question is this:
 
 I want to create a java class that can get the
 username/password/hostname for the sql DB from the deployment
 descriptor without using a jsp/bean.
 
 Is there a method that will allow me access the Deployment Descriptor
 variables directly from a java class in my project?
 
 Thanks much
 -Aaron
- 15
 - Column numbers is stack trace - enhancement requestI filed the following enhancement request to Sun. Would like to hear
 opinion about how useful implementing this feature would be.
 
 Synopsis: Need column numbers in stack traces
 Description:
 A DESCRIPTION OF THE REQUEST :
 Stack traces contain only line numbers and in certain cases line number
 alone is not sufficient for figuring out where exactly an exception
 occurred. Consider the following line of code.
 
 value = getItem().getRelatedItem().getName().getValue();
 
 If the above line throws a NullPointerException, we have no clue
 whether it is the getItem, getRelatedItem or the getName that is
 returning a null value. So providing just the line number is not
 sufficiently helpful in narrowing down the problem. If the stack trace
 also contains the column number where the null was encountered, it will
 be really helpful.
 
 Though the above code could be rewritten to several lines so that we
 can clearly identify which method returned null, there are tons of such
 existing code and changing them all will be an unreasonably complex
 task.