System.exit(0) closing both JFrames

Question

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);

Answer 1

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