Command pattern in Java 4 : Command Pattern « Design Pattern « Java

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Java » Design Pattern » Command Pattern 




Command pattern in Java 4
Command pattern in Java 4

/*
The Design Patterns Java Companion

Copyright (C) 1998, by James W. Cooper

IBM Thomas J. Watson Research Center

*/

import java.awt.Button;
import java.awt.Color;
import java.awt.FileDialog;
import java.awt.Frame;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class InnerCommand extends Frame {
  Menu mnuFile;

  MenuItem mnuOpen, mnuExit;

  Button btnRed;

  Panel p;

  Frame fr;

  //-----------------------------------------
  public InnerCommand() {
    super("Frame without commands");
    fr = this;
    MenuBar mbar = new MenuBar();
    setMenuBar(mbar);

    mnuFile = new Menu("File"true);
    mbar.add(mnuFile);

    mnuOpen = new MenuItem("Open...");
    mnuFile.add(mnuOpen);
    mnuExit = new MenuItem("Exit");
    mnuFile.add(mnuExit);

    mnuOpen.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        FileDialog fDlg = new FileDialog(fr, "Open a file",
            FileDialog.LOAD);
        fDlg.show();
      }
    });

    mnuExit.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        System.exit(0);
      }

    });

    btnRed = new Button("Red");
    p = new Panel();
    add(p);
    p.add(btnRed);

    btnRed.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        p.setBackground(Color.red);
      }

    });
    setBounds(100100200100);
    setVisible(true);
  }

  //-----------------------------------------
  static public void main(String argv[]) {
    new InnerCommand();
  }

}
//=====================================



           
       














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