Open Education – Page 275

May 01

A TextField that uses key events to correct the spelling of the names of computer languages entered into it #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

By Author-Check- Article-or-Video in FromSitesTree.com

import java.awt.*;
import java.awt.event.*;

/** A spelling-correcting TextField for entering
 *  a language name.
 *  
 *******************

public class LanguageField extends TextField {
  private String[] substrings =
    { "", "J", "Ja", "Jav", "Java" };

  public LanguageField() {
    addKeyListener(new SpellingCorrector());
    addActionListener(new WordCompleter());
    addFocusListener(new SubliminalAdvertiser());
  }

  // Put caret at end of field.
  
  private void setCaret() {
    setCaretPosition(5);
  }
  
  // Listener to monitor/correct spelling as user types.
  
  private class SpellingCorrector extends KeyAdapter {
    public void keyTyped(KeyEvent event) {
      setLanguage();
      setCaret();
    }

    // Enter partial name of good programming language that
    // most closely matches what they've typed so far.
    
    private void setLanguage() {
      int length = getText().length();
      if (length < = 4) {
        setText(substrings[length]);
      } else {
        setText("Java");
      }
      setCaret();
    }
  }

  // Listener to replace current partial name with
  // most closely-matching name of good language.
  
  private class WordCompleter implements ActionListener {

    // When they hit RETURN, fill in the right answer.
    
    public void actionPerformed(ActionEvent event) {
      setText("Java");
      setCaret();
    }
  }

  // Listener to give the user a hint.
  
  private class SubliminalAdvertiser extends FocusAdapter {
    public void focusGained(FocusEvent event) {
      String text = getText();
      for(int i=0; i<10; i++) {
        setText("Hint: Java");
        setText(text);
      }
    }
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10367
Categories:Programming Code Examples, Java/J2EE/J2ME, Mouse and Keyboard Events
Tags:Java/J2EE/J2MEMouse and Keyboard Events
Post Data:2017-01-02 16:04:35

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Apr 30

Applet that uses processXxx methods to print detailed reports on mouse events. Illustrates low-level alternative to handling events with listeners. #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

By Author-Check- Article-or-Video in FromSitesTree.com

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*; 

/** Prints non-detailed reports of mouse events.
 *  Uses the low-level processXxxEvent methods instead
 *  of the usual event listeners.
 *  
 *****************

public class MouseReporter extends Applet {
  public void init() {
    setBackground(Color.blue); // So you can see applet in page
    enableEvents(AWTEvent.MOUSE_EVENT_MASK |
                 AWTEvent.MOUSE_MOTION_EVENT_MASK);
  }

  public void processMouseEvent(MouseEvent event) {
    System.out.println("Mouse enter/exit or click at (" +
                       event.getX() + "," +
                       event.getY() + ").");
    // In case there are MouseListeners attached:
    super.processMouseEvent(event); 
  }

  
  public void processMouseMotionEvent(MouseEvent event) {
    System.out.println("Mouse move/drag at (" +
                       event.getX() + "," +
                       event.getY() + ").");
    // In case there are MouseMotionListeners attached:
    super.processMouseMotionEvent(event);
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10366
Categories:Programming Code Examples, Java/J2EE/J2ME, Mouse and Keyboard Events
Tags:Java/J2EE/J2MEMouse and Keyboard Events
Post Data:2017-01-02 16:04:35

Apr 30

Applet that uses a anonymous nested class to handle mouse events and draw circles. Variation on third approach to event-handling: using inner classes. #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

By Author-Check- Article-or-Video in FromSitesTree.com

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

/** Draw circles centered where the user clicks.
 *  Uses anonymous inner classes.
 *  
**********************
public class CircleDrawer4 extends Applet {
  public void init() {
    setForeground(Color.blue);
    addMouseListener
      (new MouseAdapter() {
         private int radius = 25;

         public void mousePressed(MouseEvent event) {
           Graphics g = getGraphics();
           g.fillOval(event.getX()-radius,
                      event.getY()-radius,
                      2*radius,
                      2*radius);
         }
      });
  }
}
*******************

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10365
Categories:Programming Code Examples, Java/J2EE/J2ME, Mouse and Keyboard Events
Tags:Java/J2EE/J2MEMouse and Keyboard Events
Post Data:2017-01-02 16:04:35

Apr 30

CircleDrawer3.java Applet that uses a named nested class to handle mouse events and draw circles. Illustrates third approach to event-handling with listeners: using inner classes. #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

By Author-Check- Article-or-Video in FromSitesTree.com

import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

/** Draw circles centered where the user clicks.
 *  Uses named inner classes.
 *  
 ******************

public class CircleDrawer3 extends Applet {
  public void init() {
    setForeground(Color.blue);
    addMouseListener(new CircleListener());
  }

  private class CircleListener extends MouseAdapter {
    private int radius = 25;

    public void mousePressed(MouseEvent event) {
      Graphics g = getGraphics();
      g.fillOval(event.getX()-radius,
                 event.getY()-radius,
                 2*radius,
                 2*radius);
    }
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10364
Categories:Programming Code Examples, Java/J2EE/J2ME, Mouse and Keyboard Events
Tags:Java/J2EE/J2MEMouse and Keyboard Events
Post Data:2017-01-02 16:04:35

Apr 30

Tiny applet that uses CircleListener to handle mouse events. #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

By Author-Check- Article-or-Video in FromSitesTree.com

import java.applet.Applet;
import java.awt.*;

/** Draw circles centered where the user clicks.
 *  Uses an external listener.
 *  
 ***********
public class CircleDrawer1 extends Applet {
  public void init() {
    setForeground(Color.blue);
    addMouseListener(new CircleListener());
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10362
Categories:Programming Code Examples, Java/J2EE/J2ME, Mouse and Keyboard Events
Tags:Java/J2EE/J2MEMouse and Keyboard Events
Post Data:2017-01-02 16:04:35

Apr 30

A simple applet that uses the ClickListener class #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

By Author-Check- Article-or-Video in FromSitesTree.com

ClickReporter.java A simple applet that uses the ClickListener class to handle mouse events.
***************
import java.applet.Applet;
import java.awt.*;

/** Prints a message saying where the user clicks.
 *  Uses an external listener.
 *  
 ******
public class ClickReporter extends Applet {
  public void init() {
    setBackground(Color.yellow);
    addMouseListener(new ClickListener());
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10360
Categories:Programming Code Examples, Java/J2EE/J2ME, Mouse and Keyboard Events
Tags:Java/J2EE/J2MEMouse and Keyboard Events
Post Data:2017-01-02 16:04:35

Apr 30

Applet handle mouse events #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

By Author-Check- Article-or-Video in FromSitesTree.com

%%%%%%%%%%%%%%
ClickReporter.java A simple applet that uses the class to handle mouse events
%%%%%%%%%%%%%%
import java.applet.Applet;
import java.awt.*;

/** Prints a message saying where the user clicks.
* Uses an external listener.
*

*******************

public class ClickReporter extends Applet {
public void init() {
setBackground(Color.yellow);
addMouseListener(new ClickListener());
}
}
%%%%%%%%%%%%%%

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017

From: http://sitestree.com/?p=10359
Categories:Programming Code Examples, Java/J2EE/J2ME, Mouse and Keyboard Events
Tags:Java/J2EE/J2MEMouse and Keyboard Events
Post Data:2017-01-02 16:04:35

Apr 30

Subclass of MouseAdapter #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

By Author-Check- Article-or-Video in FromSitesTree.com

!!!!!!!!!!!!
ClickListener.java A simple subclass of MouseAdapter that reports where the mouse was pressed. When attached to an applet, look for the report in the Java Console.
!!!!!!!!!!!!
import java.awt.event.*;

/** The listener used by ClickReporter.
 *  
 **************

public class ClickListener extends MouseAdapter {
  public void mousePressed(MouseEvent event) {
    System.out.println("Mouse pressed at (" +
                       event.getX() + "," +
                       event.getY() + ").");
  }
}
< <<<<<<<<<<<<<

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10358
Categories:Programming Code Examples, Java/J2EE/J2ME, Mouse and Keyboard Events
Tags:Java/J2EE/J2MEMouse and Keyboard Events
Post Data:2017-01-02 16:04:35

Apr 30

# RMI Example – Numerical Integration, a more realistic RMI example that sends an evaluatable object (function) from a client to a server for numerical integration. #Programming Code Examples #Java/J2EE/J2ME #Network Programming

By Author-Check- Article-or-Video in FromSitesTree.com

# RMI Example - Numerical Integration, a more realistic RMI example that sends an evaluatable object (function) from a client to a server for numerical integration. 

Integral.java  Performs actual numerical integration of the function (evaluatable object).

/** A class to calculate summations and numeric integrals. The
 *  integral is calculated according to the midpoint rule.
 *
 *  Taken from Core Web Programming from
 *  Prentice Hall and Sun Microsystems Press,
 *  .
 *  © 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted.
 */

public class Integral {
  /** Returns the sum of f(x) from x=start to x=stop, where the
   *  function f is defined by the evaluate method of the
   *  Evaluatable object.
   */

  public static double sum(double start, double stop,
                           double stepSize,
                           Evaluatable evalObj) {
    double sum = 0.0, current = start;
    while (current  0) ? args[0] : "localhost";
      RemoteIntegral remoteIntegral =
        (RemoteIntegral)Naming.lookup("rmi://" + host +
                                      "/RemoteIntegral");
      for(int steps=10; steps 0) ? args[0] : "localhost";
      RemoteIntegral remoteIntegral =
        (RemoteIntegral)Naming.lookup("rmi://" + host +
                                      "/RemoteIntegral");
      for(int steps=10; steps< =10000; steps*=10) {
        System.out.println
          ("Approximated with " + steps + " steps:" +
           "n  Integral from 0 to pi of sin(x)=" +
           remoteIntegral.integrate(0.0, Math.PI,
                                    steps, new Sin()) +
           "n  Integral from pi/2 to pi of cos(x)=" +
           remoteIntegral.integrate(Math.PI/2.0, Math.PI,
                                    steps, new Cos()) +
           "n  Integral from 0 to 5 of x^2=" +
           remoteIntegral.integrate(0.0, 5.0, steps,
                                    new Quadratic()));
      }
      System.out.println
        ("`Correct' answer using Math library:" +
         "n  Integral from 0 to pi of sin(x)=" +
         (-Math.cos(Math.PI) - -Math.cos(0.0)) +
         "n  Integral from pi/2 to pi of cos(x)=" +
         (Math.sin(Math.PI) - Math.sin(Math.PI/2.0)) +
         "n  Integral from 0 to 5 of x^2=" +
         (Math.pow(5.0, 3.0) / 3.0));
    } catch(RemoteException re) {
      System.out.println("RemoteException: " + re);
    } catch(NotBoundException nbe) {
      System.out.println("NotBoundException: " + nbe);
    } catch(MalformedURLException mfe) {
      System.out.println("MalformedURLException: " + mfe);
    }
  }
}

rmiclient.policy  Policy file for the client. Grants permissions for the client to connect to the RMI server and Web server. 

//  Taken from Core Web Programming from
//  Prentice Hall and Sun Microsystems Press,
//  .
//  © 2001 Marty Hall and Larry Brown;
//  may be freely used or adapted.

grant {
  // rmihost - RMI registry and the server
  // webhost - HTTP server for stub classes
  permission java.net.SocketPermission 
    "rmihost:1024-65535", "connect";
  permission java.net.SocketPermission 
    "webhost:80", "connect";
};

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10239
Categories:Programming Code Examples, Java/J2EE/J2ME, Network Programming
Tags:Java/J2EE/J2MENetwork Programming
Post Data:2017-01-02 16:04:28

Apr 30

RMI Example – Message, illustrates retrieving a message from an object located on a remote server. Requires the following classes: #Programming Code Examples #Java/J2EE/J2ME #Network Programming

By Author-Check- Article-or-Video in FromSitesTree.com

RMI Example - Message, illustrates retrieving a message from an object located on a remote server. Requires the following classes: 

Rem.java  Establishes which methods the client can access in the remote object. 





import java.rmi.*;

/** The RMI client will use this interface directly. The RMI
 *  server will make a real remote object that implements this,
 *  then register an instance of it with some URL.
 *
 *  Taken from Core Web Programming from
 *  Prentice Hall and Sun Microsystems Press,
 *  .
 *  © 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted.
 */

public interface Rem extends Remote {
  public String getMessage() throws RemoteException;
}


RemClient.java  The client application which communicates to the remote object and retrieves the message. 

import java.rmi.*; // For Naming, RemoteException, etc.
import java.net.*; // For MalformedURLException
import java.io.*;  // For Serializable interface

/** Get a Rem object from the specified remote host.
 *  Use its methods as though it were a local object.
 *
 *  Taken from Core Web Programming from
 *  Prentice Hall and Sun Microsystems Press,
 *  .
 *  © 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted.
 */

public class RemClient {
  public static void main(String[] args) {
    try {
      String host =
        (args.length > 0) ? args[0] : "localhost";
      // Get the remote object and store it in remObject:
      Rem remObject =
        (Rem)Naming.lookup("rmi://" + host + "/Rem");
      // Call methods in remObject:
      System.out.println(remObject.getMessage());
    } catch(RemoteException re) {
      System.out.println("RemoteException: " + re);
    } catch(NotBoundException nbe) {
      System.out.println("NotBoundException: " + nbe);
    } catch(MalformedURLException mfe) {
      System.out.println("MalformedURLException: " + mfe);
    }
  }
}


RemImpl.java  The concrete, remote object that implements the methods in Rem.java. 

import java.rmi.*;
import java.rmi.server.UnicastRemoteObject;

/** This is the actual implementation of Rem that the RMI
 *  server uses. The server builds an instance of this, then
 *  registers it with a URL. The client accesses the URL and
 *  binds the result to a Rem (not a RemImpl; it doesn't
 *  have this).
 *
 *  Taken from Core Web Programming from
 *  Prentice Hall and Sun Microsystems Press,
 *  .
 *  © 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted.
 */

public class RemImpl extends UnicastRemoteObject
                     implements Rem {
  public RemImpl() throws RemoteException {}

  public String getMessage() throws RemoteException {
    return("Here is a remote message.");
  }
}


RemServer.java  Creates an instance of RemImpl on the remote server and binds the object in the registry for lookup by the client. 

import java.rmi.*;
import java.net.*;

/** The server creates a RemImpl (which implements the Rem
 *  interface), then registers it with the URL Rem, where
 *  clients can access it.
 *
 *  Taken from Core Web Programming from
 *  Prentice Hall and Sun Microsystems Press,
 *  .
 *  © 2001 Marty Hall and Larry Brown;
 *  may be freely used or adapted.
 */

public class RemServer {
  public static void main(String[] args) {
    try {
      RemImpl localObject = new RemImpl();
      Naming.rebind("rmi:///Rem", localObject);
    } catch(RemoteException re) {
      System.out.println("RemoteException: " + re);
    } catch(MalformedURLException mfe) {
      System.out.println("MalformedURLException: " + mfe);
    }
  }
}

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10238
Categories:Programming Code Examples, Java/J2EE/J2ME, Network Programming
Tags:Java/J2EE/J2MENetwork Programming
Post Data:2017-01-02 16:04:28

Scrum master vs Product owner

Scrum versus Kanban at scale

LPM — Lean Portfolio Management

Story points: Fibonacci, Poker, Agile

How to Prioritize all the stories using MoSCoW

A TextField that uses key events to correct the spelling of the names of computer languages entered into it #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

Applet that uses processXxx methods to print detailed reports on mouse events. Illustrates low-level alternative to handling events with listeners. #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

Applet that uses a anonymous nested class to handle mouse events and draw circles. Variation on third approach to event-handling: using inner classes. #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

CircleDrawer3.java Applet that uses a named nested class to handle mouse events and draw circles. Illustrates third approach to event-handling with listeners: using inner classes. #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

Tiny applet that uses CircleListener to handle mouse events. #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

A simple applet that uses the ClickListener class #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

Applet handle mouse events #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

Subclass of MouseAdapter #Programming Code Examples #Java/J2EE/J2ME #Mouse and Keyboard Events

# RMI Example – Numerical Integration, a more realistic RMI example that sends an evaluatable object (function) from a client to a server for numerical integration. #Programming Code Examples #Java/J2EE/J2ME #Network Programming

RMI Example – Message, illustrates retrieving a message from an object located on a remote server. Requires the following classes: #Programming Code Examples #Java/J2EE/J2ME #Network Programming

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Scrum master vs Product owner

Scrum versus Kanban at scale

LPM — Lean Portfolio Management

Story points: Fibonacci, Poker, Agile

How to Prioritize all the stories using MoSCoW

ValidateNotNullOrEmpty