Why won't System.exit(0) work?

Question

does System.exit(0); work with an event handler?
I'm making a quit menu button, and I want my program to quit when it is clicked...unfortunately, System.exit(0); is not working...can soemone please help?
thanks!

Answer 1

here's all mmy code......i'm really at a loss...i can't figure anything out......
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.util.*;
public class SafetyMapView extends JFrame {
     // These are the tiles and buttons
     private JPanel               tiles;
     private JButton[]          buttons;
     private JCheckBox           editWallsButton;
     private JCheckBox           selectExitsButton;
     private JButton           computePlanButton;
     private JCheckBox           showDistancesButton;
     private JButton           resetButton;
     private JMenuBar          theMenuBar;
     private JMenu               fileM;
     private JMenuItem          openM,saveM,quitM;
     private JFileChooser      showIt;
     public void setJMenuBar(JMenuBar aMenuBar){theMenuBar=aMenuBar;}
     public JButton getFloorTileButton(int i) { return buttons; }
     public JPanel getTilePanel() { return tiles; }
     public JCheckBox getEditWallsButton() { return editWallsButton; }
     public JCheckBox getSelectExitsButton() { return selectExitsButton; }
     public JButton getComputePlanButton() { return computePlanButton; }
     public JCheckBox getShowDistancesButton() { return showDistancesButton; }
     public JButton getResetButton() { return resetButton; }
     public JFileChooser getJFileChooser() { return showIt; }
     public JMenuItem getOpen() { return openM;}
     public JMenuItem getSave() { return saveM;}
     public JMenuItem getQuit() { return quitM;}
     // This constructor builds the panel
     public SafetyMapView(String title, FloorPlan floorPlan) { 
          super(title);
          // Create the panel with the floor tiles on it      
          createFloorPlanPanel(floorPlan);
          // Layout the rest of the window's components
setupComponents();
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(600, 500);
setVisible(true);
// Create the panel to contain the buttons that display the floor plan
private void createFloorPlanPanel(FloorPlan floorPlan) {
     // Setup the panel with the buttons
buttons = new JButton[floorPlan.size()*floorPlan.size()];
tiles = new JPanel();
tiles.setLayout(new GridLayout(floorPlan.size(),floorPlan.size()));
          // Add the buttons to the tile panel
for (int r=0; r<floorPlan.size(); r++) {
     for (int c=0; c<floorPlan.size(); c++) {
          int i = r * floorPlan.size() + c;
          buttons[i] = new JButton();
          buttons[i].setBorder(BorderFactory.createLineBorder(Color.lightGray));
          buttons[i].setBackground(Color.white);
          tiles.add(buttons[i]);
     public void setOpenHandler(java.awt.event.ActionListener x){
     /*public void setSaveHandler(java.awt.event.ActionListener x){
               int option = 0;
               java.io.File sel = null;
               java.io.File[] files = null;
               String filename = null;
               javax.swing.JFileChooser chsr = new javax.swing.JFileChooser();
               option = chsr.showSaveDialog(null);
               switch (option)
               case javax.swing.JFileChooser.APPROVE_OPTION :
               //do something
                    a.dispose();
                    break;
               case javax.swing.JFileChooser.CANCEL_OPTION :
               sel = null;
               break;
               case javax.swing.JFileChooser.ERROR :
               sel = null;
               break;
               default :
               sel = null;
               break;
               chsr.setEnabled(false);
               //do something
               return;
               //DO something...//
// Here we add all the components to the window accordingly
private void setupComponents() {
     // Layout the components using a gridbag
GridBagLayout layout = new GridBagLayout();
GridBagConstraints layoutConstraints = new GridBagConstraints();
getContentPane().setLayout(layout);
// Add the tiles
layoutConstraints.gridx = 0; layoutConstraints.gridy = 1;
layoutConstraints.gridwidth = 1; layoutConstraints.gridheight = 7;
layoutConstraints.fill = GridBagConstraints.BOTH;
layoutConstraints.insets = new Insets(2, 2, 2, 2);
layoutConstraints.anchor = GridBagConstraints.NORTHWEST;
layoutConstraints.weightx = 1.0; layoutConstraints.weighty = 1.0;
layout.setConstraints(tiles, layoutConstraints);
getContentPane().add(tiles);
JMenuBar myMenuBar = new JMenuBar();
layoutConstraints.gridx = 0; layoutConstraints.gridy = 0;
layoutConstraints.gridwidth = layoutConstraints.gridheight = 1;
layoutConstraints.fill=GridBagConstraints.NONE;
layoutConstraints.insets = new Insets(2, 2, 2, 2);
layoutConstraints.anchor = GridBagConstraints.NORTHWEST;
layoutConstraints.weightx = 0.0; layoutConstraints.weighty = 0.0;
layout.setConstraints(myMenuBar, layoutConstraints);      
          JMenu fileMenu = new JMenu("File");
          myMenuBar.add(fileMenu);
          fileMenu.setMnemonic('F');
          JMenuItem openM = new JMenuItem("Open Floor Plan");
          fileMenu.add(openM);
          openM.setMnemonic ('O');
          JMenuItem saveM = new JMenuItem("Save Floor Plan");
          fileMenu.add(saveM);
          saveM.setMnemonic ('S');
          JMenuItem quitM = new JMenuItem("Quit");
          fileMenu.add(quitM);
          quitM.setMnemonic ('Q');
          getContentPane().add(myMenuBar);
public static void main(String args[]){
     //try{
     new SafetyMapView("Fire Safety Routes", FloorPlan.example1());
     //catch(java.io.FileNotFoundException e){
     //     e.printStackTrace();
I cut out the parts where all the other buttons are being added to the layout cuz it was really relaly long....