System.exit(0) question

What does the number 0 on System.exit(0);do? I have tried different digits but they all seem to do the same thing-terminate the virtual machine. So why the convention of 0 and not 7 or 13?

stealing from the javadoc (Runtime.exit) (You might also want to look into overriding SecurityManager.checkExit method):
Terminates the currently running Java virtual machine by initiating its shutdown sequence. This method never returns normally. The argument serves as a status code; by convention, a nonzero status code indicates abnormal termination.
The virtual machine's shutdown sequence consists of two phases. In the first phase all registered shutdown hooks, if any, are started in some unspecified order and allowed to run concurrently until they finish. In the second phase all uninvoked finalizers are run if finalization-on-exit has been enabled. Once this is done the virtual machine halts.
If this method is invoked after the virtual machine has begun its shutdown sequence then if shutdown hooks are being run this method will block indefinitely. If shutdown hooks have already been run and on-exit finalization has been enabled then this method halts the virtual machine with the given status code if the status is nonzero; otherwise, it blocks indefinitely.

Similar Messages

System.exit(0) access denied

I am trying to exit a card game program when the user selects Exit from a menu, so in the actionlistener I simply put
System.exit(0);It compiles fine, but I get a runtime error when the Exit menu option is clicked saying
java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.0)
Anyone know why?

Hello friends,
Well, I have the same problem.
" java.security.AccessControlException: access denied (java.lang.RuntimePermission exitVM.0) "
The program is an applet ... all the buttons are in a frame(so to speak) that is called by the applet.
I have added that applet in a html file. Now if I try to run that html page... it do not work at all.
I am new in this field. Please give me straight directions.
( If you do not understand the questions right, better do not answer. )
Thanks in advance.
/N

NoClassDefFoundError after System.exit() is called.

I have found a strange condition with JDK 1.4.2_05 and could not find a bug which relates to it.
I have multiple threads running, when I shutdown, I call all the threads to shutdown and finally in main I call System.exit(0).
The strange thing is that one shutdown I get a NoClassDefFoundError for a class which will load fine if loaded before shutting down.
This occurs as the class in question is only needed to perform a shutdown, and in fact the attempt to load it comes after the main thread has finished.
The workaround has been to create an instance of the class when the application is started rather than during shutdown.
Does anyone seen this behaviour?

java.lang.NoClassDefFoundError: com/cantor/framework/run/impl/ShutdownRMB
     at com.can.framework.run.RunnerManagerBean.shutdown(RunnerManagerBean.java:147)
     at com.can.framework.layer.VanillaBean.shutdown(VanillaBean.java:278)
     at com.can.main.Main.main(Main.java:135)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at com.intellij.rt.execution.application.AppMain.main(AppMain.java:78)

System Exit Overriding Busy Loop

Hi,
Why would the following code not result in a clean JVM termination when SIGINT is sent? The JVM appears to capture the SIGINT correctly (it hits the shutdown hook), but the System.exit(-1) call cannot seem to override the busy loop and terminate the spawned thread. Is this expected behavior for the VM?
public class TestSigInt {
     public TestSigInt()
          new Thread()
               public void run()
                    while(true)
          }.start();
          Runtime.getRuntime().addShutdownHook(new Thread()
               public void run()
                    System.exit(-1);
     public static void main(String[] args)
          TestSigInt tsi = new TestSigInt();
}Thanks,
hhung

Is this expected behavior for the VM?Yes. See javadoc for System.exit(), that leads to to Runtime.exit():
If this method is invoked after the virtual machine has begun its shutdown sequence then if shutdown hooks are being run this method will block indefinitely
So the method blocks (and presumably does nothing, but I admit I'm making up that last bit) if called as part of a shutdown hook.
the System.exit(-1) call cannot seem to override the busy loop and terminate the spawned threadRegardless of the fact that it's called from a shutdown hook, which previous messages (and the javadoc quoted) already question, there's nothing in the API javadoc that suggests that threads are gracefully "terminated".
This situation is not different from regular situations when you want to nicely end a thread in an otherwise running Java application: the API does not provide any built-in API (except Thread.stop() and destroy() which are deprecated and which use is strongly discouraged) to stop a running thread.
See Thread.interrupt() which somehow "kindly" requests interruption of a running thread, but this requires cooperation of the target thread (whose code shoud regularly poll Thread.getCurrentThread().isInterrupted() and terminate accrodingly).
The usual recommendation to make this more explicit in the code, is that the thread's code regularly checks a business-logic specific boolean, such as:
class StoppableTask implements Runnable {
    private boolean shouldContinue = true;
    public void run() {
        while (shouldContinue) {
            // do stuff
    public void requestStop() {
        shouldContinue = false;
public void class StopperThread {
    StoppableTask target;
    public void doOtherStuff() {
        target.requestStop();
}This requires cooperation form the target thread's code as well, so this is not conceptually different from the interrupt() scheme, it just has different scope (it won't unblock IOs for example).
Note that I deliberately used Runnable as opposed to Thread, first because it is a recommend practice (but you may know that already and your example was intentionally shorter to get to the point), second to highlight that the specific-solution does not use any built-in java.lang.Thread method.
Edited by: jduprez on Dec 8, 2009 11:28 AM

System.exit() causes Firefox to close

Hi.
I have a strange problem - I have an app which can be both an applet and a standalone application. At some point is calls System.exit() and it can happen in an applet too. (It's easy to redesign the code but that;s not my question)
Strange enough (for me at least) the call causes the whole browser to close! (Observed in FF 1.5.x and 2.0, reported in IE7). Is this supposed to happen?
Thanks.

No, this isn�t a bug. You should not call System.exit from an applet, instead use the life cycle methods of the Applet class.

How to intercept "System.exit"?

I am writing a large GUI application that optionally spawns other GUI threads. These spawned threads are special-purpose text editors. It is important that the editor knows when it is about to be closed, so that it can prompt the user to save a modified file.
The editors are based upon javax.swing.JFrame, and I have overridden the "windowClosing" method of a WindowAdapter to check file status and prompt when necessary. This method performs as desired when I close the editor window manually. However, when I close the main application (which calls System.exit(0) ), the editor frames also close without any invocation of my windowClosing method.
Is there any way the dependent editor JFrame can be alerted that the virtual machine is about to be ended? I could probably keep a list in my main application of all the dependent processes that need to be cleanly ended, but it would be much simpler (and so much more object-oriented) if the dependent thread could take care of itself!

MarkHausman wrote:
As you suggested, I posted this question on the Swing forum.
For those who are interested: the Swing solution I was offered was to make use of the static function Frame.getFrames(). This allows access to all frames launched by an application. By putting this call in my main shutdown method, I can identify all spawned editor frames and call each one's shutdown method.
This is not as satisfying as my original desire, to have the spawned frame recognize when the VM is about to close, but it is easy enough to implement that I am going with it.And why wouldn't addShutdownHook() work?

Simple split cache semantics on System.exit?

We have observed, with the default configuration (no override xmls at all), that cache entries get lost under the following case:
1) Start an instance with java -jar coherence.jar
2) Run an application, also with no config overrides, that:
-puts some entries in a named cache (timeout long)
-System.exit()
3) Then immediately run another app that tries to pull the entries from the same named cache
Sometimes #3 works, and sometimes it finds nothing. In all cases, 2 & 3 do connect with 1.
This leads to the following questions:
1) Is the problem that the local cache is not being pushed into the backing partitioned cache before the exit?
2) How can this be rectified (other than sleeping before exiting)?
2A) Is there a "I'm done with this cache, but keep it in the backing store" semantics in one of the calls #2 could make?
2B) Is there a parameter in getting the cache that can be used
2C) Is there config that can insure that this always works
2D) Is there a way that #2 can tell when its data has made it to the cluster (backing cache)?
Thanks in advance

Hi John,
We have observed, with the default configuration (no
override xmls at all), that cache entries get lost
under the following case:
1) Start an instance with java -jar coherence.jarAs I mentioned earlier, we used to have some problems with using the console application as a cache server. Please use DefaultCacheServer instead.
2) Run an application, also with no config overrides,
that:
-puts some entries in a named cache (timeout long)
-System.exit()Which cache? Different named caches have different semantics in the stock configuration. Did you use a transactional cache?
Would you post your test code?
3) Then immediately run another app that tries to
pull the entries from the same named cache
Sometimes #3 works, and sometimes it finds nothing.
In all cases, 2 & 3 do connect with 1.
This leads to the following questions:
1) Is the problem that the local cache is not being
pushed into the backing partitioned cache before the
exit?There is no such concept as a local cache and a non-local in case of Coherence clustered caches.
If the put method call returned, then that data is supposed to be cluster durable.
The only situations I can come up with off my head for what you wrote to be normal (considering that there is cluster node 1 which supposed to live through all which you wrote) is if you
- either put your data to a cache configured to be a LocalCache (it is not clustered)
- or if you put it into a partitioned cache with backup-count configured to be zero (which is not the default setting).
- or if you put it into a TransactionMap and you did not commit it.
- programming errors somewhere
2) How can this be rectified (other than sleeping
before exiting)?I think that should work fine as it is.
2A) Is there a "I'm done with this cache, but keep it
in the backing store" semantics in one of the calls
#2 could make?There is the CacheFactory.shutdown() call indicating polite departure. However its omission should not explain this situation.
2B) Is there a parameter in getting the cache that
can be usedUsed for what? I don't understand the question...
2C) Is there config that can insure that this always
worksI think, it should work out of the box.
2D) Is there a way that #2 can tell when its data
has made it to the cluster (backing cache)?
In general, the return of the put operation means that the data is cluster-durable (if backup count is at least one for partitioned caches and there is another node or there is another node running the service in case of replicated caches).
Best regards,
Robert

Closing a JFrame without using System.exit(0)

Hello all,
I'm writting an application at the moment that uses a JFrame as an "about box" invoked when a menu item from another JFrame is selected . The about box is set to undecorated, and I have set up an Thread to handle an animation of the credits that move up slowly. I have also added into it code to play a sound file while the credits are running.
I wanted to have it so that the user can just click once anywhere on the Panel area of the about box, and that would close the about box window and stop the sound.
I can get it to stop the sound on click no problem, what I'm having issues with is closing just the about box Frame. I've used System.exit(0) but this closes the original application, which I dont want it to do. I've been looking at online example code and I've found that dispose() might work... Problem is my JFrame for the about box is initiated in the main applications JFrame under an eventListener for the menuItem 'about'. The sound file is played inside the JPanel of the about box. And the listener to close it is located in the same place ( about box JPanel ).. does anyone know how to get this frame ( initiated in main applications JFrame ) and dispose of this frame through code located in the JPanel of the about box.
I hope this is descriptive enough for you.
Please let me know if you have any questions about my question.
Many thanks,
Mark.

It seems you are asking how to find the parent frame of a Component that you know is within a frame?
You can getParent() of the component. If it is a frame (instanceof) - dispose, else check for the getParent()...
If you don't want to code it yourself use SwingUtilities.getWindowAncestor(Component) to get the Window in which the panel is.
HTH
Mike

System.exit vs. programm flow

Hellas!
Short question:
Why is
public boolean foo(){
throw new IllegalArgumentException();
}ok, where
public boolean foo(){
System.exit(0);
}is wrong (compiler demands a return statement)? Isn't there no way the exit method returns to the method foo?
TIA, flutschfinger

spoon_ wrote:
Technically it can throw a SecurityException:
http://java.sun.com/javase/6/docs/api/java/lang/System.html#exit(int)
So does the first method. The second either exits (the method doesn't return normally) or throws an exception, so I guess it will never return anything.
In any case they are not going to change the Java language to treat the library function System.exit() specially. You can always just put a "return false" after it or something.So it's just a specification thing?

Why in COM, set smth true, stays true even after System.exit?

I am using "Jacob" to do COM calls. When I alter the "ShowAll" property of Word.Application and I set it to true, it will then forever be true even if I exit the application AND quit the word application. If I set it to false, the same thing happens, it will always be so. The code to call/set this is:
(NOTE: This uses classes I made to wrap the Dispatch calls)
Word wordApp = new Word();
Documents docs = wordApp.getDocuments();
Document doc = docs.open("D:\\JavaProjects\\Test.doc");
//GET VIEW
View wordView = wordApp.getActiveWindow().getView();
//PRINT THE VIEW PROPERTIES
System.out.println("Show All: " + wordApp.getActiveWindow().getView().isShowAll());
System.out.println("Show Paragraphs: " + wordApp.getActiveWindow().getView().isShowParagraphs());
//SET THE VIEW PROPERTIES
wordView.setShowAll(false);
wordView.setShowParagraphs(true);
//PRINT THEM AGAIN
System.out.println("Show All: " + wordApp.getActiveWindow().getView().isShowAll());
System.out.println("Show Paragraphs: " + wordApp.getActiveWindow().getView().isShowParagraphs());
doc.close(Document.DO_NOT_SAVE);
wordApp.quit(new Variant[] {});
System.exit(0);The actual Dispatch calls are:
//NO IDEA WHY THIS IS, BUT SHOWALL = TRUE IS -1, AND FALSE IS 0
private final static int SHOW_ALL_TRUE = -1;
private final static int SHOW_ALL_FALSE = 0;
/** SETSHOWPARAGRAPHS **
* Sets the property (boolean) ShowParagraphs.
public void setShowParagraphs(boolean showParagraphs)
 Dispatch.put(this, "ShowParagraphs", new Boolean(showParagraphs));
/** ISSHOWPARAGRAPHS **
* Returns Boolean of whether or not this is set to show paragraphs.
public boolean isShowParagraphs()
 return getBooleanValue(Dispatch.get(this, "ShowParagraphs"));
private boolean getBooleanValue(Variant variantBoolean)
 //MAKE IT AN INTEGER AND GET ITS int VALUE
 int intVariant = new Integer(variantBoolean.toString()).intValue();
 //RETURN IF IS SHOW ALL
 return (intVariant == View.SHOW_ALL_TRUE);
}I'm wondering if the problem is that I get back either -1 or 0 and if maybe that means something else?

1: Properties persistence is not a DEFECT but a FEATURE . It was implemented in MS Word so users could change MS word WITHOUT HAVING TO DO IT EACH TIME THEY START IT UP.
2: Don't you intialise all your variables in your code after you instanciated them ? I am sure you do so and therefore the persitence feature you described should not be annoying you at all. It is not necessary to intialise variables in the BASIC langage but that does not mean you should not do it.
3: (-1) was chosen arbitrary by Microsoft as the TRUE value for Boolean datatype and 0 the value for FALSE when they designed Visual Basic. This is not a problem if you write code properly
I recommend you test bool variable in any langages using the following test:
(myBool <> 0)
HAVE A THINK ABOUT IT
Finally,
you need to understand what you are working with before you complain about it.
Argument for Argument sake is not good and if you think MS word is a bad program just don't use it. go and write your own word processor in JAVA.
GOOD LUCK
I WISH TO APOLOGISE FOR ANY POSSIBLE SPELLING OR GRAMMATICAL MISTAKES I COULD HAVE MADE IN THIS REPLY. ENGLISH NOT BEING MY FIRST LANGUAGE.

Denying system.exit in java code

My objective is to nullifying the system.exit programmed. By goggling i learn t that this can be done by adding permission in policy file. But as far my google search i dont understand how to deny a permission. Most of them says about granting a permission. Can anyone clarify how to deny a permission.
Steps i tried.
Sample program: which does nothing other than calling system.exit(0) as the first line in main method.
added the following line to java.policy file in my JAVA_HOME/jre/lib/security
grant {
permission java.lang.RuntimePermission "exitVM";
Also tried adding only
permission java.lang.RuntimePermission "exitVM";
to the already available grant block.
Also commented out
//grant codeBase "file:${java.home}/lib/ext/*" {
// permission java.security.AllPermission;
After that i understood that the default java policy file is java.home\lib\security\java.policy. So made all the change above mentioned there too.
But i could not achieve it. Can any one help me on this.
Win 2000/ Java1.4.2_12/no command line arguments while running the program.

Welcome to the Forums.
Please go through the FAQ of the Forum.
You has posted your query in the wrong Forum, this one is dedicated to Oracle Forms.
Please try {forum:id=1050}.
Regards,

The ABAP call stack was: SYSTEM-EXIT of program BBPGLOBAL

Hi
We are using SRM 5.0. We are facing a strange problem. We are able to see the initial screen of SRM EBP in the browser. But once the user name and password are provided the system goes for a dump with the following error:
The following error text was processed in the system SS0 : System error
The error occurred on the application server <Server Name> and in the work process 0 .
The termination type was: ABORT_MESSAGE_STATE
The ABAP call stack was: SYSTEM-EXIT of program BBPGLOBAL
SM21 Log:
Short Text
 Transaction Canceled &9&9&5 ( &a &b &c &d &e &f &g &h &i )
 The transaction has been terminated. This may be caused by a
 termination message from the application (MESSAGE Axxx) or by an error
 detected by the SAP System due to which it makes no sense to proceed
 with the transaction. The actual reason for the termination is
 indicated by the T100 message and the parameters.
Transaction Canceled ITS_P 001 ( )
Message Id: ITS_P
Message No: 001
I just checked these threads but did not help much,
RABAX_STATE error after loggin into BBPSTART service in SRM 4.
ITS_TEMPLATE_NOT_FOUND error
Besides I tried this note: 790727 as well, still I get the same error.
Any help would be highly appreciated.
Thanks in advance
Kathirvel Balakrishnan

Hi
Please do the following steps.
When you are using the Internal ITS,you need not run the report W3_PUBLISH_SERVICES.(only SIAC_PUBLISH_ALL_INT )
ALso pls check the foll:
-->activate the services through SICF tcode.
> Go to SICF transaction and activate the whole tree under the node Default host>sap>bc>gui>sap>its.
>Also maintain the settings in SE80>utilities>settings>internet transaction server-->test service/Publish. (BBPSTART , BBPGLOBAL etc)
Table TWPURLSVR should have entries for the / SRM server line as well as gui and web server.
Could you please review again the following steps ?
Did you check that ICM was working correctly (Transaction - SMICM) ?
1-Activate the necessary ICF services
With transaction SICF and locate the
services by path
/sap/public/bc/its/mimes
/sap/bc/gui/sap/its/webgui
2- Publish the IAC Services
With Transaction SE80 locate from
the menu Utilities -> Settings ->
Internet Transaction Server (Tab) ->
Publish (Tab) and set On Selected
Site = INTERNAL.
3- Locate the Internet Services SYSTEM and WEBGUI.
Publish these services with the Context
Menu -> Publish -> Complete Service
4- Browse to http://<server>:<icmport>/sap/bc/gui/
sap/its/webgui/! and login to the
webgui.
Hope this will help.
Please reward suitable points.
Regards
- Atul

How to track System.exit(0) call

hi there,
how can i trace the System.exit(0) function call in my program.
i.e as we know which class is being loaded into the jvm by overriding
the classloader, can we similarly know when is our jvm going to be
destroyed. here iam invoking jvm from my windows program using invocation api.
any help is mostly appreciated.
thanks in advance
bye
ramana

Not sure I know what you are asking.
You could create a security manager which prevents exit() from being called.
You could replace System using the bootstrap command line option. Although if you do that you can not distribute it due to the license agreement. Once replaced you can do anything you want in the application.
You could use Runtime.addShutdownHook() if you just want to do something when the application exits.

System.exit doesnt work on Sun OS 5.7 ??

Hi, I have encountered a kind of wierd problem. I have a small application that uses System.exit when the user wants to shut down the application.
That works fine in Windows but in Sun OS 5.7 the application just freeze.
Im using java version:
java version "1.4.1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-b21)
Java HotSpot(TM) Client VM (build 1.4.1-b21, mixed mode)
Would be greatful if someone could help me.
This code is an small example of my application.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class ExitTest extends JFrame implements ActionListener {
JButton jButton1 = new JButton();
public ExitTest() {
try {
jbInit();
catch(Exception e) {
e.printStackTrace();
public static void main(String[] args) {
new ExitTest().setVisible(true);
private void jbInit() throws Exception {
jButton1.setText("Exit");
jButton1.addActionListener(this);
addWindowListener(this);
this.getContentPane().add(jButton1, BorderLayout.SOUTH);
public void actionPerformed(ActionEvent e) {
this.setVisible(false);
System.out.println("Exiting");
try {
System.exit(0);
} catch(SecurityException ex) {
ex.printStackTrace();
---------------------------------------------------------------------------------------------------------

Hmm, sorry about that, my misstake, that line is still there from an erlier attempt to use windowlisteners instead ... that line should not be there ...

System.exit(0) closing both JFrames

hey, ive got a problem with a JFrame
Ive got 1 JFrame that currently holds a JMenuBar, 2 JMenus and in the 1st JMenu there are 4 JMenuItems.
One of the JMenuItems uses an ActionListener to lauch another JFrame, but when the 2nd JFrame is finished (and System.exit(0) launches), the first JFrame closes as well. What is going on??
code follows:
THE MAIN JFRAME
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
public class realframe extends JFrame
protected JMenuItem[] m_fontMenus;
protected JCheckBoxMenuItem m_showPatList;
protected JCheckBoxMenuItem m_showPatData;
protected JCheckBoxMenuItem m_showHRGraph;
protected JCheckBoxMenuItem m_showBPGraph;
protected JCheckBoxMenuItem m_showTempGraph;
public realframe(){
super("PMS Menu GUI");
setSize(450, 350);
JMenuBar menuBar = createMenuBar();
setJMenuBar(menuBar);
WindowListener wndCloser = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
addWindowListener(wndCloser);
setVisible(true);
//start Menus
protected JMenuBar createMenuBar()
final JMenuBar menuBar = new JMenuBar();
//creates File
JMenu mFile = new JMenu("File");
//Menu 1 item 1 : : : Add Patient
JMenuItem item = new JMenuItem("Add Patient");
ActionListener lst = new ActionListener() //ActionListener for Add Patient
public void actionPerformed(ActionEvent e)
new realgui( new JFrame() );
item.addActionListener(lst);
mFile.add(item);
//Menu 1 item 2 : : : Delete Patient
item = new JMenuItem("Delete Patient");
lst = new ActionListener()
public void actionPerformed(ActionEvent e) { }
item.addActionListener(lst);
mFile.add(item);
//Menu 1 item 3 : : : Search
item = new JMenuItem("Search");
lst = new ActionListener()
public void actionPerformed(ActionEvent e) { }
item.addActionListener(lst);
mFile.add(item);
//Divider
mFile.addSeparator();
//Menu 1 item 4 : : : Exit
item = new JMenuItem("Exit");
item.setMnemonic('x');
lst = new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
item.addActionListener(lst);
mFile.add(item);
menuBar.add(mFile);
//end menu item 1
ActionListener viewListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
updateMonitor();
JMenu mView = new JMenu("View");
mView.setMnemonic('V');
//Menu 2 item 1 : : : Patient List Toggle
m_showPatList = new JCheckBoxMenuItem("Patient List");
m_showPatList.setMnemonic('L');
m_showPatList.setSelected(true);
m_showPatList.addActionListener(viewListener);
mView.add(m_showPatList);
//Menu 2 item 2 : : : Data box Toggle
m_showPatData = new JCheckBoxMenuItem("Patient Data");
m_showPatData.setMnemonic('D');
m_showPatData.setSelected(true);
m_showPatData.addActionListener(viewListener);
mView.add(m_showPatData);
//Divider
mView.addSeparator();
//Menu 2 item 3 : : : HR Graph toggle
m_showHRGraph = new JCheckBoxMenuItem("Show HR Graph");
m_showHRGraph.setMnemonic('H');
m_showHRGraph.setSelected(true);
m_showHRGraph.addActionListener(viewListener);
mView.add(m_showHRGraph);
//menu 2 item 4 : : : BP Graph Toggle
m_showBPGraph = new JCheckBoxMenuItem("Show BP Graph");
m_showBPGraph.setMnemonic('B');
m_showBPGraph.setSelected(true);
m_showBPGraph.addActionListener(viewListener);
mView.add(m_showBPGraph);
//menu 2 item 5 : : : Temp Graph Toggle
m_showTempGraph = new JCheckBoxMenuItem("Show Temp Graph");
m_showTempGraph.setMnemonic('T');
m_showTempGraph.setSelected(true);
m_showTempGraph.addActionListener(viewListener);
mView.add(m_showTempGraph);
menuBar.add(mView); //adds the menu
return menuBar;
protected void updateMonitor() { }
public static void main(String argv[]) { new realframe(); }
THE SECONDARY JFRAME
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
public class realgui extends JDialog implements ActionListener
JTextField surname;
JTextField given;
JTextField age;
JTextField doctor;
JTextField phone;
Patient patient = new Patient();
JRadioButton radiomale;
JRadioButton radiofemale;
public realgui( JFrame frame )
super( frame, true );
System.out.println("in 1");
setTitle( "Add A New Patient" );
setSize( 400, 250 );
JPanel panel = new JPanel( new BorderLayout() );
panel.setLayout( new GridBagLayout() );
panel.setBorder( new EmptyBorder( new Insets( 5, 5, 5, 5 ) ) );
getContentPane().add( BorderLayout.CENTER, panel );
GridBagConstraints c = new GridBagConstraints();
Dimension shortField = new Dimension( 40, 20 );
Dimension mediumField = new Dimension( 100, 20 );
Dimension longField = new Dimension( 180, 20 );
EmptyBorder border = new EmptyBorder( new Insets( 0, 0, 0, 10 ) );
EmptyBorder border1 = new EmptyBorder( new Insets( 0, 20, 0, 10 ) );
c.insets = new Insets( 2, 2, 2, 2 );
c.anchor = GridBagConstraints.WEST;
JLabel lbl1 = new JLabel( "Surname:" );
lbl1.setBorder( border );
c.gridx = 0;
c.gridy = 0;
c.gridwidth = 1;
panel.add( lbl1, c );
surname = new JTextField();
surname.setPreferredSize( longField );
c.gridx = 1;
c.gridwidth = 3;
panel.add(surname, c );
JLabel lbl7 = new JLabel( "Given Name:" );
lbl7.setBorder( border );
c.gridx = 0;
c.gridy = 1;
c.gridwidth = 1;
panel.add( lbl7, c );
given = new JTextField();
given.setPreferredSize( longField );
c.gridx = 1;
c.gridwidth = 3;
panel.add(given, c );
JLabel lbl2 = new JLabel( "Age:" );
lbl2.setBorder( border );
c.gridx = 0;
c.gridy = 2;
c.gridwidth = 1;
panel.add( lbl2, c );
age = new JTextField();
age.setPreferredSize( shortField );
c.gridx = 1;
c.gridwidth = 3;
panel.add( age, c );
JLabel lbl3 = new JLabel( "Gender:" );
lbl3.setBorder( border );
c.gridx = 0;
c.gridy = 3;
panel.add( lbl3, c );
JPanel radioPanel = new JPanel();
radioPanel.setLayout( new FlowLayout( FlowLayout.LEFT, 5, 0 ) );
ButtonGroup group = new ButtonGroup();
radiomale = new JRadioButton( "Male" );
radiomale.setSelected( true );
group.add(radiomale);
radiofemale = new JRadioButton( "Female" );
group.add(radiofemale);
radioPanel.add(radiomale);
radioPanel.add(radiofemale);
c.gridx = 1;
c.gridwidth = 3;
panel.add( radioPanel, c);
JLabel lbl4 = new JLabel( "Doctor:" );
lbl4.setBorder( border );
c.gridx = 0;
c.gridy = 4;
panel.add( lbl4, c );
doctor = new JTextField();
doctor.setPreferredSize( longField );
c.gridx = 1;
c.gridwidth = 3;
panel.add(doctor, c );
JLabel lbl5 = new JLabel( "Phone Number:" );
lbl5.setBorder( border );
c.gridx = 0;
c.gridy = 5;
c.gridwidth = 1;
panel.add( lbl5, c );
phone = new JTextField();
phone.setPreferredSize( mediumField );
c.gridx = 1;
c.gridwidth = 3;
panel.add(phone, c );
JButton submitBtn = new JButton( "Submit" );
c.gridx = 4;
c.gridy = 0;
c.gridwidth = 1;
c.fill = GridBagConstraints.HORIZONTAL;
panel.add( submitBtn, c );
submitBtn.addActionListener(this);
JButton cancelBtn = new JButton( "Cancel" );
c.gridy = 1;
c.anchor = GridBagConstraints.NORTH; // anchor north
panel.add( cancelBtn, c );
cancelBtn.addActionListener(this);
WindowListener wndCloser = new WindowAdapter()
public void windowClosing(WindowEvent e)
System.exit(0);
addWindowListener( wndCloser );
setVisible( true );
public static void main( String[] args ) {
new realgui( new JFrame() );
public void actionPerformed(ActionEvent evt)
if (evt.getActionCommand ().equals ("Submit"))
Person person = new Person();
String surnam = surname.getText();
String give = given.getText();
String ag = age.getText();
String docto = doctor.getText();
String phon = phone.getText();
char gende;
if(radiomale.isSelected()==true)
gende = 'M';
else
gende = 'F';
System.out.println("in 2 " + surnam);
person.setSurname(surnam);
person.setGiven(give);
// person.setAge(ag);
person.setDoctor(docto);
person.setPhone(phon);
person.setGender(gende);
System.out.println(surnam + " " + give + " " + ag + " " + gende + " " + docto + " " + phon);
person.setHistory();
patient.add(person);
System.exit(0);

No, dispose() is inherited. Just replace System.exit(0); with:
setVisible(false);
dispose();I think that'll work in your code.

System.exit(0) question

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