Исходный текст приложения MenuApp

Исходный текст приложения MenuApp представлен в листинге 1.

Листинг 1. Файл MenuApp.java

import java.awt.*;

public class MenuApp

{

  public static void main(String args[])

  {

    MainFrameWnd frame = 

      new MainFrameWnd("MenuApp");

    frame.setSize(

    frame.getInsets().left +

      frame.getInsets().right  + 320,

      frame.getInsets().top  +

      frame.getInsets().bottom + 240); 

    frame.show();

  }

}

class MainFrameWnd extends Frame

{

  MenuBar mbMainMenuBar;

  Menu mnFile;

  Menu mnHelp;

  public MainFrameWnd(String sTitle)

  {

    super(sTitle);    

    setSize(400, 200);

    setBackground(Color.yellow);

    setForeground(Color.black);

    setLayout(new FlowLayout());

    mbMainMenuBar = new MenuBar();

    mnFile = new Menu("File");

    mnFile.add("New");

    mnFile.add("-");

    mnFile.add("Exit");

    mnHelp = new Menu("Help"); 

    mnHelp.add("Content");

    mnHelp.add("-");

    mnHelp.add("About");

    mbMainMenuBar.add(mnFile);

    mbMainMenuBar.add(mnHelp);

    setMenuBar(mbMainMenuBar);

  }

  public void paint(Graphics g)

  {

    g.setFont(new Font(

      "Helvetica", Font.PLAIN, 12));

    g.drawString("Frame window", 10, 70);

    super.paint(g);

  }

  public boolean handleEvent(Event evt)

  {

    if(evt.id == Event.WINDOW_DESTROY)

    {

      setVisible(false);

      System.exit(0);

      return true;

    }

    else

      return super.handleEvent(evt);

  }

  public boolean action(Event evt, Object obj)

  {

    MenuItem mnItem;

    if(evt.target instanceof MenuItem)

    {

      mnItem = (MenuItem)evt.target;

      if(obj.equals("Exit"))

      {

        System.exit(0);

      }

      else if(obj.equals("New"))

      {

        MessageBox mbox;

        mbox = new MessageBox(

          "Item New selected",

          this, "Dialog from Frame", true);

        mbox.show();

      }

      else if(obj.equals("Content"))

      {

        MessageBox mbox;

        mbox = new MessageBox(

          "Item Content selected",

          this, "Dialog from Frame", true);

        mbox.show();

      }

      else if(obj.equals("About"))

      {

        MessageBox mbox;

        mbox = new MessageBox(

          "Item About selected",

          this, "Dialog from Frame", true);

        mbox.show();

      }

      else

        return false;

      return true;

    }

    return false;

  }

}

class MessageBox extends Dialog

{

  Label lbMsg;

  Button btnOK;

  public MessageBox(String sMsg, 

    Frame  parent, String  sTitle,

    boolean  modal)

  {

    super(parent, sTitle, modal);

    resize(200, 100);

    setLayout(new GridLayout(2, 1));

    lbMsg = new Label(sMsg, Label.CENTER);

    add(lbMsg);

    btnOK = new Button("OK");

    add(btnOK);

  }

  public boolean handleEvent(Event evt)

  {

    if(evt.id == Event.WINDOW_DESTROY)

    {

      dispose();

      return true;

    }

    else

      return super.handleEvent(evt);

  }

  public boolean action(Event evt, Object obj)

  {

    Button btn;

    if(evt.target instanceof Button)

    {

      btn = (Button)evt.target;

      if(evt.target.equals(btnOK))

      {

        dispose();

      }

      else

        return false;

      return true;

    }

    return false;

  }

}