Setting the heap size
Hi all,
I wanted to ask you about setting the heap size value.
How we can calculate the heap size?
I had problems with the max heap size in my application.
So I increased the max value to 2048 MB, but I am afraid that
the same error may come up again some time depending upon the
usage.
So how I can find, say for a server having 2 GB RAM,
how much heap size I should give? I read that there is no defined
formula to calculate this. But I wanted to get the best way of doing it.
Please advise,
Sandeep
As has already been said, you probably have a leak. However, when trying to gauge the maximum heap you can (not should, but can) use you have to take into account what the server is doing, and its operating system. You do not want your JVM to page. So, for a 2GB server, with no other app on it, I think the "usual" is something like 75% max? Though I really wouldn't take my word for it...it's not my field.
Similar Messages
-
How to set the heap size of JVM
please let me know that how to set the heap size of JVM
C:\>java -X
-Xmixed mixed mode execution (default)
-Xint interpreted mode execution only
-Xbootclasspath:<directories and zip/jar files separated by ;>
set search path for bootstrap classes and resources
-Xbootclasspath/a:<directories and zip/jar files separated by ;>
append to end of bootstrap class path
-Xbootclasspath/p:<directories and zip/jar files separated by ;>
prepend in front of bootstrap class path
-Xnoclassgc disable class garbage collection
-Xincgc enable incremental garbage collection
-Xbatch disable background compilation
-Xms<size> set initial Java heap size
-Xmx<size> set maximum Java heap size
-Xss<size> set java thread stack size
-Xprof output cpu profiling data
-Xrunhprof[:help]|[:<option>=<value>, ...]
perform JVMPI heap, cpu, or monitor profiling
-Xdebug enable remote debugging
-Xfuture enable strictest checks, anticipating future default
-Xrs reduce use of OS signals by Java/VM (see documentation)look at the -Xm? lines
-Xms<size> set initial Java heap size
-Xmx<size> set maximum Java heap sizeThis can be used e.g. like this:java -Xms8M -Xmx32M MyProgwhich runs MyProg in a java VM with the initial heap size of 8 MB and a maximum heap size of 32 MB.
- Marcus -
How to set the heap size in adminstrative console
Hi All,
Please let me know how to increase heap size in weblogic Adminstrative console.
Regards
MadhuThe answer to this depends on whether you're trying to set the heap size for a manager server which is managed by NodeManager, or the admin server.
First click on "Lock and Edit".
If the former, go into "Environment"->"Servers", then click on the server you want to configure. This should start you on the "Configuration"->"General" tab. Now click on the "Server Start" tab. Find the "Arguments" field. Assuming this is blank, put something like the following in the field value:
-Xmx1536m
Then click "Save", then "Activate Changes". When you restart the managed server the next time, it should use those new settings.
If, however, you're trying to set this on the admin server, you can't do this in the admin console at all. In that case, go into $DOMAIN_HOME/bin and edit the "setDomainEnv.{sh,cmd}" script (".sh" if on Unix/Linux, ".cmd" on Windows). Find the line that sets the "MEM_ARGS" variable, like the following on Windows:
set MEM_ARGS=-Xms256m -Xmx512m
Change this line to whatever you want, then restart the admin server. -
Hi,
I am wondering what's the default heap size if I don't add -ms -mx opation? I
set the two options and the following is the output from -verbosegc. what's it
means?
Thanks.
[GC 2598K->2145K(2696K), 0.0035829 secs]
[GC 2656K->2201K(2824K), 0.0036262 secs]
[Full GC 2713K->2070K(4028K), 0.1933980 secs]
[GC 2582K->2229K(4028K), 0.0046565 secs]
[GC 2741K->2373K(4028K), 0.0061002 secs]
[GC 2885K->2514K(4028K), 0.0064346 secs]
[GC 3026K->2656K(4028K), 0.0061670 secs]
[GC 3168K->2798K(4028K), 0.0054694 secs]
[GC 3310K->2940K(4028K), 0.0054521 secs]
[GC 3452K->3080K(4028K), 0.0058119 secs]
[GC 3592K->3216K(4028K), 0.0059069 secs]
[GC 3728K->3357K(4028K), 0.0057200 secs]
[GC 3869K->3496K(4028K), 0.0055719 secs]
[GC 4008K->3636K(4156K), 0.0057239 secs]
[Full GC 4148K->3649K(6544K), 0.3064887 secs]
[GC 4091K->3773K(6544K), 0.0412259 secs]
[GC 4285K->3912K(6544K), 0.0052336 secs]
[GC 4424K->4051K(6544K), 0.0055661 secs]
[GC 4563K->4189K(6544K), 0.0055543 secs]
[GC 4701K->4326K(6544K), 0.0055703 secs]
[GC 4838K->4464K(6544K), 0.0055915 secs]
[GC 4976K->4608K(6544K), 0.0059667 secs]
[GC 5120K->4746K(6544K), 0.0053261 secs]
[GC 5258K->4884K(6544K), 0.0053761 secs]
[GC 5396K->5023K(6544K), 0.0059290 secs]
[GC 5534K->5159K(6544K), 0.0054320 secs]
[GC 5671K->5301K(6544K), 0.0114341 secs]
[GC 5813K->5405K(6544K), 0.0103658 secs]
[GC 5917K->5492K(6544K), 0.0053194 secs]
[GC 6003K->5592K(6544K), 0.0107092 secs]
[GC 6104K->5694K(6544K), 0.0096887 secs]
[GC 6206K->5786K(6544K), 0.0037949 secs]
[GC 6298K->5890K(6544K), 0.0101172 secs]
[GC 6402K->5990K(6544K), 0.0041271 secs]
[GC 6502K->6097K(6672K), 0.0040678 secs]
[Full GC 6609K->6191K(10992K), 0.2664733 secs]
Tue Dec 04 15:22:10 PST 2001:<I> <T3Services> CacheManagerImpl: EMAIL TEMPLATE
C
ACHE STARTING
[GC 6849K->6361K(10992K), 0.0586387 secs]
Tue Dec 04 15:22:10 PST 2001:<I> <T3Services> CacheManagerImpl: SCHEDULE CACHE
S
TARTING
[GC 7129K->6530K(10992K), 0.0083019 secs]
[GC 7298K->6678K(10992K), 0.0058533 secs]
[GC 7446K->6807K(10992K), 0.0052940 secs]
[GC 7575K->6920K(10992K), 0.0048598 secs]I think the default heap size is 16MB, as for the GC output:
these [GC 2598K->2145K(2696K), 0.0035829 secs]
show the collection of Objects within the eden area of the heap (Short lived Objects),
the heap size before GC was 2598K and after GC was 2145K and the time taken was
0.0035829 secs.
These outputs:
[Full GC 2713K->2070K(4028K), 0.1933980 secs]
show the details for a full GC, these are the ones to watch out for, they will
take longer and the JVM (no mater how many processors) will block during a full
GC....I.E no server response at all.
The smaller the heap size the more often a full GC will occur, however the larger
the heap, the longer the full GC will take.
One of the new options for jdk 1.3.1 is the -Xincgc option, this will do incremental
Garbage Collection, overall it will take longer than normal, but the individual
Full GCs will take less time....so the server is not hung for as long at any one
time.
Set -Xms (the minimum heap) to the same as -Xmx (max heap), this increases performance
as the JVM does not have to repeatedly assign more memory to the heap.
Gareth
"Jen" <[email protected]> wrote:
>
Hi,
I am wondering what's the default heap size if I don't add -ms -mx opation?
I
set the two options and the following is the output from -verbosegc.
what's it
means?
Thanks.
[GC 2598K->2145K(2696K), 0.0035829 secs]
[GC 2656K->2201K(2824K), 0.0036262 secs]
[Full GC 2713K->2070K(4028K), 0.1933980 secs]
[GC 2582K->2229K(4028K), 0.0046565 secs]
[GC 2741K->2373K(4028K), 0.0061002 secs]
[GC 2885K->2514K(4028K), 0.0064346 secs]
[GC 3026K->2656K(4028K), 0.0061670 secs]
[GC 3168K->2798K(4028K), 0.0054694 secs]
[GC 3310K->2940K(4028K), 0.0054521 secs]
[GC 3452K->3080K(4028K), 0.0058119 secs]
[GC 3592K->3216K(4028K), 0.0059069 secs]
[GC 3728K->3357K(4028K), 0.0057200 secs]
[GC 3869K->3496K(4028K), 0.0055719 secs]
[GC 4008K->3636K(4156K), 0.0057239 secs]
[Full GC 4148K->3649K(6544K), 0.3064887 secs]
[GC 4091K->3773K(6544K), 0.0412259 secs]
[GC 4285K->3912K(6544K), 0.0052336 secs]
[GC 4424K->4051K(6544K), 0.0055661 secs]
[GC 4563K->4189K(6544K), 0.0055543 secs]
[GC 4701K->4326K(6544K), 0.0055703 secs]
[GC 4838K->4464K(6544K), 0.0055915 secs]
[GC 4976K->4608K(6544K), 0.0059667 secs]
[GC 5120K->4746K(6544K), 0.0053261 secs]
[GC 5258K->4884K(6544K), 0.0053761 secs]
[GC 5396K->5023K(6544K), 0.0059290 secs]
[GC 5534K->5159K(6544K), 0.0054320 secs]
[GC 5671K->5301K(6544K), 0.0114341 secs]
[GC 5813K->5405K(6544K), 0.0103658 secs]
[GC 5917K->5492K(6544K), 0.0053194 secs]
[GC 6003K->5592K(6544K), 0.0107092 secs]
[GC 6104K->5694K(6544K), 0.0096887 secs]
[GC 6206K->5786K(6544K), 0.0037949 secs]
[GC 6298K->5890K(6544K), 0.0101172 secs]
[GC 6402K->5990K(6544K), 0.0041271 secs]
[GC 6502K->6097K(6672K), 0.0040678 secs]
[Full GC 6609K->6191K(10992K), 0.2664733 secs]
Tue Dec 04 15:22:10 PST 2001:<I> <T3Services> CacheManagerImpl: EMAIL
TEMPLATE
C
ACHE STARTING
[GC 6849K->6361K(10992K), 0.0586387 secs]
Tue Dec 04 15:22:10 PST 2001:<I> <T3Services> CacheManagerImpl: SCHEDULE
CACHE
S
TARTING
[GC 7129K->6530K(10992K), 0.0083019 secs]
[GC 7298K->6678K(10992K), 0.0058533 secs]
[GC 7446K->6807K(10992K), 0.0052940 secs]
[GC 7575K->6920K(10992K), 0.0048598 secs] -
How to set the Heap size for JAVA
I am facing the memory out of space problem:
Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space
Could anyone suggest me a solution to solve the problem ?
increase the heap size ?
anyway to increase the heap size in the program by default without additional setup?
Thank you.How to determine the program must handled with increase heap size ?
could I know any method to know whether the program is memory leaking or need large memory heap size? -
Is it possible to set the heap size limits in system-wide config?
Hi,
I am trying to set the JRE heap size limits (-Xms and -Xmx) by using the system-level deployment.properties file. The JRE version is 1.6 update 6.
Normally, I would have something like this in the user-level deployment.properties file:
deployment.javapi.jre.1.6.0_06.args=-Xms64M -Xmx192MHowever, when the same line is put in the system-level properties, it does not seem to have any effect. I have tried different options, also unsuccessfully:
javaplugin.vm.options=-Xms64M -Xmx192M
or
javaplugin.minHeapSize=64m
javaplugin.maxHeapSize=192mIs it not possible to address this setting via system-level properties at all? I am hoping that I will not have to resort to per-user config files.
Best regards,
MartinHi Michael,
thank you for your answer. I am sorry, I was unable to find the link to the message 10144001.
My ultimate goal would be setting the system level settings as opposed to settings per applet. I was unable to find any mentioning of "deployment.javapi.jre.X.X.X_XX.args" in the official documentation here: http://java.sun.com/j2se/1.5.0/docs/guide/deployment/deployment-guide/properties.html
Best regards,
Martin -
Plz can you help me. How to increase the Heap Size!!!!!!!!!!!
Hi,
i'm new to 10g appl server
Failed to deploy web application "AGXI51". Failed to deploy web application "AGXI51". . The evaluate phase failed. The Adapter used in the evaluate may have thrown an exception.
Resolution:
Please call Oracle support.
Base Exception:
java.lang.OutOfMemoryError
null. java.lang.OutOfMemoryError
i'm getting this Error while deploying the application.So wat is the procedure to increase the Heap Size
Regards,
Niranjan.DLocate opmn.xml on your instance. In file locate section relevant for container you use (i.e. "home"). In next line you can see tags where startup parameters are set. You should add following parameters (this will set heap size on 512Mb)
-Xms512m -Xmx512m
For detailed explanation I would recommend you to check following link:
http://download-uk.oracle.com/docs/cd/B25221_03/web.1013/b14431/troublesht.htm
Hope this help. -
Upto how much I can set maximum Heap size for jvm?
I am running application on 8GB RAM Windows 64 bits machine.
I am running out of OutOfMemory (Heap Space). I want to increase the Heap Size for my jvm.
But can anybody please tell me what is the limit by which I can set the maximum size for heap?
Thanks in Advance,
JenishMax allowed memory per process is 2 raised to the 64th power. What maximum memory you can set depends on the memory available
for your application. You may be able to set more than 8GB ram then it will use the swap space and it will slow down your application
performance. So try different memory size and see which one works best for your application. -
How to increase the heap size of the container in whioch BPEL is running ?
Hi All,
I recently raised an SR they have asked me to do the following,
Can you please try and start the container running the BPEL process with max
heap space (-Xmx) of 2 GB and the eden space (-Xmn) at about 60% of 1228m and
the option -XX:+AggressiveHeap set. (even though this option is recommended for
multi processor machines say 4)
can anyone kindly explain me how to increase the Heap size and Eden size of BPEL container ?
Thank YouHi Deepak I cant see any attribute or element in the oc4j_opmn.xml file regarding heap memory. In the server properties I changed the size of heap memeory how can I rollback.
I am getting the following error
Configuration information
Running in C:\product\10.1.3.1\OracleAS_1
Operation mode:Startup, App Server, No Enterprise Manager, Single Instance
Oracle home:C:\product\10.1.3.1\OracleAS_1
Oracle home name:Unnamed
Instance name:SOA.01hw117905.India.TCS.com
Instance type:allProducts
Version:10.1.3.4.0
Uses infrastructure:false
Not an infrastructure instance, no infrastructure information available
Components:[j2ee, apache, orabpel, oraesb, owsm, Wsil]
2009-08-19 09:08:51.863--Begin log output for Mid-tier services (SOA.01hw117905.India.TCS.com)
2009-08-19 09:08:51.863--Processing Step: starting OPMN
2009-08-19 09:09:00.394--Processing Step: starting OPMN managed processes
2009-08-19 09:09:35.19--End log output for Mid-tier services (SOA.01hw117905.India.TCS.com)
An unknown OPMN error has occured
oracle.appserver.startupconsole.model.ConsoleException: An unknown OPMN error has occured
at oracle.appserver.startupconsole.control.OPMNController.doStart(OPMNController.java:121)
at oracle.appserver.startupconsole.control.Controller.start(Controller.java:69)
at oracle.appserver.startupconsole.control.GroupController.doStart(GroupController.java:47)
at oracle.appserver.startupconsole.control.Controller.start(Controller.java:69)
at oracle.appserver.startupconsole.view.controller.ControllerAdapter.start(ControllerAdapter.java:30)
at oracle.appserver.startupconsole.view.controller.MasterControlAdapter.run(MasterControlAdapter.java:94)
at oracle.appserver.startupconsole.view.Runner.main(Runner.java:39)
Caused by: oracle.ias.opmn.optic.OpticControlException: Error from opmn during process control operation
at oracle.ias.opmn.optic.AbstractOpmnEntity.runCommand(AbstractOpmnEntity.java:174)
at oracle.ias.opmn.optic.AbstractOpmnEntity.start(AbstractOpmnEntity.java:110)
at oracle.appserver.startupconsole.control.OPMNController.doStart(OPMNController.java:89)
... 6 more
Exception caused by
Error from opmn during process control operation
oracle.ias.opmn.optic.OpticControlException: Error from opmn during process control operation
at oracle.ias.opmn.optic.AbstractOpmnEntity.runCommand(AbstractOpmnEntity.java:174)
at oracle.ias.opmn.optic.AbstractOpmnEntity.start(AbstractOpmnEntity.java:110)
at oracle.appserver.startupconsole.control.OPMNController.doStart(OPMNController.java:89)
at oracle.appserver.startupconsole.control.Controller.start(Controller.java:69)
at oracle.appserver.startupconsole.control.GroupController.doStart(GroupController.java:47)
at oracle.appserver.startupconsole.control.Controller.start(Controller.java:69)
at oracle.appserver.startupconsole.view.controller.ControllerAdapter.start(ControllerAdapter.java:30)
at oracle.appserver.startupconsole.view.controller.MasterControlAdapter.run(MasterControlAdapter.java:94)
at oracle.appserver.startupconsole.view.Runner.main(Runner.java:39)
<?xml version='1.0' encoding='WINDOWS-1252'?>
<response>
<msg code="-82" text="Remote request with weak authentication.">
</msg>
<opmn id="01hw117905:6200" http-status="206" http-response="2 of 3 processes started.">
<ias-instance id="SOA.01hw117905.India.TCS.com">
<ias-component id="default_group">
<process-type id="home">
<process-set id="default_group">
<process id="172" pid="2176" status="Alive" index="1" log="C:\product\10.1.3.1\OracleAS_1\opmn\logs\\default_group~home~default_group~1.log" operation="request" result="success">
<msg code="0" text="">
</msg>
</process>
</process-set>
</process-type>
<process-type id="oc4j_soa">
<process-set id="default_group">
<process id="173" pid="5556" status="Stopped" index="1" log="C:\product\10.1.3.1\OracleAS_1\opmn\logs\\default_group~oc4j_soa~default_group~1.log" operation="request" result="failure">
<msg code="-21" text="failed to start a managed process after the maximum retry limit">
</msg>
</process>
</process-set>
</process-type>
</ias-component>
<ias-component id="HTTP_Server">
<process-type id="HTTP_Server">
<process-set id="HTTP_Server">
<process id="171" pid="2724" status="Alive" index="1" log="C:\product\10.1.3.1\OracleAS_1\opmn\logs\\HTTP_Server~1.log" operation="request" result="success">
<msg code="0" text="">
</msg>
</process>
</process-set>
</process-type>
</ias-component>
</ias-instance>
</opmn>
</response> -
I am Making a program for purchasing games, with the basic layout alsot done, except on problem. When the purchase button is pressed, a dialog shows up but nothing is seen until i resize it. How would i set the frame size so that i do not need to resize it each time? below is the code for the files. Many thanks in advance.
CreditDialog
import java.awt.*;
import java.awt.event.*;
class CreditDialog extends Dialog implements ActionListener { // Begin Class
private Label creditLabel = new Label("Message space here",Label.RIGHT);
private String creditMessage;
private TextField remove = new TextField(20);
private Button okButton = new Button("OK");
public CreditDialog(Frame frameIn, String message) { // Begin Public
super(frameIn); // call the constructor of dialog
creditLabel.setText(message);
add("North",creditLabel);
add("Center",remove);
add("South",okButton);
okButton.addActionListener(this);
setLocation(150,150); // set the location of the dialog box
setVisible(true); // make the dialog box visible
} // End Public
public void actionPerformed(ActionEvent e) { // Begin actionPerformed
// dispose(); // close dialog box
} // End actionPerformed
} // End Class
MobileGame
import java.awt.*;
import java.awt.event.*;
class MobileGame extends Panel implements ActionListener { // Begin Class
The Buttons, Labels, TextFields, TextArea
and Panels will be created first.
private int noOfGames;
// private GameList list;
private Panel topPanel = new Panel();
private Panel middlePanel = new Panel();
private Panel bottomPanel = new Panel();
private Label saleLabel = new Label ("Java Games For Sale",Label.RIGHT);
private TextArea saleArea = new TextArea(7, 25);
private Button addButton = new Button("Add to Basket");
private TextField add = new TextField(3);
private Label currentLabel = new Label ("Java Games For Sale",Label.RIGHT);
private TextArea currentArea = new TextArea(3, 25);
private Button removeButton = new Button("Remove from Basket");
private TextField remove = new TextField(3);
private Button purchaseButton = new Button("Purchase");
private ObjectList gameList = new ObjectList(20);
Frame parentFrame; //needed to associate with dialog
All the above will be added to the interface
so that they are visible to the user.
public MobileGame (Frame frameIn) { // Begin Constructor
parentFrame = frameIn;
topPanel.add(saleLabel);
topPanel.add(saleArea);
topPanel.add(addButton);
topPanel.add(add);
middlePanel.add(currentLabel);
middlePanel.add(currentArea);
bottomPanel.add(removeButton);
bottomPanel.add(remove);
bottomPanel.add(purchaseButton);
this.add("North", topPanel);
this.add("Center", middlePanel);
this.add("South", bottomPanel);
addButton.addActionListener(this);
removeButton.addActionListener(this);
purchaseButton.addActionListener(this);
The following line of code below is
needed inorder for the games to be
loaded into the SaleArea
} // End Constructor
All the operations which will be performed are
going to be written below. This includes the
Add, Remove and Purchase.
public void actionPerformed (ActionEvent e) { // Begin actionPerformed
If the Add to Basket Button is pressed, a
suitable message will appear to say if the game
was successfully added or not. If not, an
ErrorDialog box will appear stateing the error.
if(e.getSource() == addButton) { // Begin Add to Basket
// GameFileHandler.readRecords(list);
try { // Begin Try
String gameEntered = add.getText();
if (gameEntered.length() == 0 ) {
new ErrorDialog (parentFrame,"Feild Blank");
} else if (Integer.parseInt(gameEntered)< 0
|| Integer.parseInt(gameEntered)>noOfGames) { // Begin Else If
new ErrorDialog (parentFrame,"Invalid Game Number");
} else { // Begin Else If
//ADD GAME
} // End Else
} catch (NumberFormatException num) { // Begin Catch
new ErrorDialog(parentFrame,"Please enter an Integer only");
} // End Catch
} // End Add to Basket
If the Remove From Basket Button is pressed, a
a suitable message will appear to say if the
removal was successful or not. If not, an
ErrorDialog box will appear stateing the error.
if(e.getSource() == removeButton) { // Begin Remove from Basket
try { // Begin Try
String gameEntered = remove.getText();
if (gameEntered.length() == 0 ) {
new ErrorDialog (parentFrame,"Feild Blank");
} else if (Integer.parseInt(gameEntered)< 1
|| Integer.parseInt(gameEntered)>noOfGames) { // Begin Else If
new ErrorDialog (parentFrame,"Invalid Game Number");
} else { // Begin Else If
//ADD GAME CODE
} // End Else
} catch (NumberFormatException num) { // Begin Catch
new ErrorDialog(parentFrame,"Please enter an Integer only");
} // End Catch
} // End Remove from Basket
If the purchase button is pressed, the
following is executed. NOTE: nothing is done
when the ok button is pressed, the window
just closes.
if(e.getSource() == purchaseButton) { // Begin Purchase
String gameEntered = currentArea.getText();
if (gameEntered.length() == 0 ) {
new ErrorDialog (parentFrame,"Nothing to Purchase");
} else { // Begin Else If
new CreditDialog(parentFrame,"Cost � 00.00. Please enter Credit Card Number");
} // End Else
} // End Purchase
} // End actionPerformed
} // End Class
RunMobileGame
import java.awt.*;
public class RunMobileGame { // Begin Class
public static void main (String[] args) { // Begin Main
EasyFrame frame = new EasyFrame();
frame.setTitle("Game Purchase for 3G Mobile Phone");
MobileGame purchase = new MobileGame(frame); //need frame for dialog
frame.setSize(500,300); // sets frame size
frame.setBackground(Color.lightGray); // sets frame colour
frame.add(purchase); // adds frame
frame.setVisible(true); // makes the frame visible
} // End Main
} // End Class
EasyFrame
import java.awt.*;
import java.awt.event.*;
public class EasyFrame extends Frame implements WindowListener {
public EasyFrame()
addWindowListener(this);
public EasyFrame(String msg)
super(msg);
addWindowListener(this);
public void windowClosing(WindowEvent e)
dispose();
public void windowDeactivated(WindowEvent e)
public void windowActivated(WindowEvent e)
public void windowDeiconified(WindowEvent e)
public void windowIconified(WindowEvent e)
public void windowClosed(WindowEvent e)
System.exit(0);
public void windowOpened(WindowEvent e)
} // end EasyFrame class
ObjectList
class ObjectList
private Object[] object ;
private int total ;
public ObjectList(int sizeIn)
object = new Object[sizeIn];
total = 0;
public boolean add(Object objectIn)
if(!isFull())
object[total] = objectIn;
total++;
return true;
else
return false;
public boolean isEmpty()
if(total==0)
return true;
else
return false;
public boolean isFull()
if(total==object.length)
return true;
else
return false;
public Object getObject(int i)
return object[i-1];
public int getTotal()
return total;
public boolean remove(int numberIn)
// check that a valid index has been supplied
if(numberIn >= 1 && numberIn <= total)
{ // overwrite object by shifting following objects along
for(int i = numberIn-1; i <= total-2; i++)
object[i] = object[i+1];
total--; // Decrement total number of objects
return true;
else // remove was unsuccessful
return false;
ErrorDialog
import java.awt.*;
import java.awt.event.*;
class ErrorDialog extends Dialog implements ActionListener {
private Label errorLabel = new Label("Message space here",Label.CENTER);
private String errorMessage;
private Button okButton = new Button("OK");
public ErrorDialog(Frame frameIn, String message) {
/* call the constructor of Dialog with the associated
frame as a parameter */
super(frameIn);
// add the components to the Dialog
errorLabel.setText(message);
add("North",errorLabel);
add("South",okButton);
// add the ActionListener
okButton.addActionListener(this);
/* set the location of the dialogue window, relative to the top
left-hand corner of the frame */
setLocation(100,100);
// use the pack method to automatically size the dialogue window
pack();
// make the dialogue visible
setVisible(true);
/* the actionPerformed method determines what happens
when the okButton is pressed */
public void actionPerformed(ActionEvent e) {
dispose(); // no other possible action!
} // end class
I Know there are alot of files. Any help will be much appreciated. Once again, Many thanks in advancesetSize (600, 200);orpack ();Kind regards,
Levi
PS:
int i;
parses to
int i;
, but
[code] int i;[code[i]]
parses to
int i; -
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