package com.stanley.memmap;import java.awt.*;import java.awt.event.*;import javax.swing.*;public class TestMemMapFrame extends JFrame {  private JButton btnBroadCast;  private JTextArea textArea;  private int mapFilePtr;  private int viewPtr;  public final int dwMemFileSize = 2 * 1024;  public static final String fileMappingObjName = "Mem_Map_File-{70122C30-0239-4f98-9D21-36885C8A8121}";  //Construct the frame  public TestMemMapFrame() {    enableEvents(AWTEvent.WINDOW_EVENT_MASK);    try {      init();    }    catch(Exception e) {      e.printStackTrace();    }  }  //Component initialization  private void init() throws Exception  {    JPanel contentPane = (JPanel) getContentPane();    contentPane.setLayout(new BorderLayout());    mapFilePtr = MemMapFile.createFileMapping(MemMapFile.PAGE_READWRITE,        0, dwMemFileSize, fileMappingObjName);    if(mapFilePtr != 0) {      viewPtr = MemMapFile.mapViewOfFile(mapFilePtr,                                         MemMapFile.FILE_MAP_READ |                                         MemMapFile.FILE_MAP_WRITE,                                         0, 0, 0);    }    textArea = new JTextArea();    contentPane.add(textArea, BorderLayout.CENTER);    btnBroadCast = new JButton("Write and BroadCast");    btnBroadCast.addActionListener(new ActionListener() {      public void actionPerformed(ActionEvent e) {        if(viewPtr != 0) {          MemMapFile.writeToMem(viewPtr, textArea.getText());          MemMapFile.broadcast();        }      }    });    JPanel panelBtn = new JPanel();    panelBtn.add(btnBroadCast);    contentPane.add(panelBtn, BorderLayout.SOUTH);    setSize(new Dimension(400, 300));    setTitle("Memory Mapped File - Java Server");  }  private void destroy() {    if(viewPtr != 0) MemMapFile.unmapViewOfFile(viewPtr);    if(mapFilePtr != 0) MemMapFile.closeHandle(mapFilePtr);  }  //Overridden so we can exit when window is closed  protected void processWindowEvent(WindowEvent e) {    super.processWindowEvent(e);    if (e.getID() == WindowEvent.WINDOW_CLOSING) {      destroy();      System.exit(0);    }  }}