May 06

Exec.java Provides static methods for running external processes from applications. #Programming Code Examples #Java/J2EE/J2ME #Basic Java 

import java.io.*;

/** A class that eases the pain of running external processes
 *  from applications. Lets you run a program three ways:
 *  
    
 *     
  1. exec: Execute the command, returning
 *         immediately even if the command is still running.
 *         This would be appropriate for printing a file.
 *     
  2. execWait: Execute the command, but don?t
 *         return until the command finishes. This would be
 *         appropriate for sequential commands where the first
 *         depends on the second having finished (e.g.,
 *         javac followed by java).
 *     
  3. execPrint: Execute the command and print the
 *          output. This would be appropriate for the Unix
 *          command ls.
 *  

 *  Note that the PATH is not taken into account, so you must
 *  specify the full pathname to the command, and shell
 *  built-in commands will not work. For instance, on Unix the
 *  above three examples might look like:
 *  
    
 *    
  1. Exec.exec("/usr/ucb/lpr Some-File");
    

     *    
    2. 

  2. 

    Exec.execWait("/usr/local/bin/javac Foo.java");
 *        Exec.execWait("/usr/local/bin/java Foo");
    

     *    
    3. 

  3. 

    Exec.execPrint("/usr/bin/ls -al");
    

     *  
    4. 



 *

 *  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 Exec {


  private static boolean verbose = true;


  /** Determines if the Exec class should print which commands

    * are being executed, and prints error messages if a problem

    * is found. Default is true.

    *

    * @param verboseFlag true: print messages, false: don?t.

    */


  public static void setVerbose(boolean verboseFlag) {

    verbose = verboseFlag;

  }


  /** Will Exec print status messages? */


  public static boolean getVerbose() {

    return(verbose);

  }


  /** Starts a process to execute the command. Returns

    * immediately, even if the new process is still running.

    *

    * @param command The full pathname of the command to

    * be executed. No shell built-ins (e.g., "cd") or shell

    * meta-chars (e.g. ">") are allowed.

    * @return false if a problem is known to occur, but since

    * this returns immediately, problems aren?t usually found

    * in time. Returns true otherwise.

    */


  public static boolean exec(String command) {

    return(exec(command, false, false));

  }


  /** Starts a process to execute the command. Waits for the

    * process to finish before returning.

    *

    * @param command The full pathname of the command to

    * be executed. No shell built-ins or shell metachars are

    * allowed.

    * @return false if a problem is known to occur, either due

    * to an exception or from the subprocess returning a

    * nonzero value. Returns true otherwise.

    */


  public static boolean execWait(String command) {

    return(exec(command, false, true));

  }


  /** Starts a process to execute the command. Prints any output

    * the command produces.

    *

    * @param command The full pathname of the command to

    * be executed. No shell built-ins or shell meta-chars are

    * allowed.

    * @return false if a problem is known to occur, either due

    * to an exception or from the subprocess returning a

    * nonzero value. Returns true otherwise.

    */


  public static boolean execPrint(String command) {

    return(exec(command, true, false));

  }


  /** This creates a Process object via Runtime.getRuntime.exec()

    * Depending on the flags, it may call waitFor on the process

    * to avoid continuing until the process terminates, and open

    * an input stream from the process to read the results.

    */


  private static boolean exec(String command,

                              boolean printResults,

                              boolean wait) {

    if (verbose) {

      printSeparator();

      System.out.println("Executing '" + command + "'.");

    }

    try {

      // Start running command, returning immediately.

      Process p  = Runtime.getRuntime().exec(command);


      // Print the output. Since we read until there is no more

      // input, this causes us to wait until the process is

      // completed.

      if(printResults) {

        BufferedReader buffer = new BufferedReader(

          new InputStreamReader(p.getInputStream()));

        String s = null;

        try {

          while ((s = buffer.readLine()) != null) {

            System.out.println("Output: " + s);

          }

          buffer.close();

          if (p.exitValue() != 0) {

            if (verbose) {

              printError(command + " -- p.exitValue() != 0");

            }

            return(false);

          }

        } catch (Exception e) {

          // Ignore read errors; they mean the process is done.

        }


      // If not printing the results, then we should call waitFor

      // to stop until the process is completed.

      } else if (wait) {

        try {

          System.out.println(" ");

          int returnVal = p.waitFor();

          if (returnVal != 0) {

            if (verbose) {

              printError(command);

            }

            return(false);

          }

        } catch (Exception e) {

          if (verbose) {

            printError(command, e);

          }

          return(false);

        }

      }

    } catch (Exception e) {

      if (verbose) {

        printError(command, e);

      }

      return(false);

    }

    return(true);

  }


  private static void printError(String command,

                                 Exception e) {

    System.out.println("Error doing exec(" + command + "): " +

                        e.getMessage());

    System.out.println("Did you specify the full " +

                       "pathname?");

  }


  private static void printError(String command) {

    System.out.println("Error executing ?" + command + "?.");

  }


  private static void printSeparator() {

    System.out.println

      ("==============================================");

  }

}


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 Post Data:2017-01-02 16:04:23


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May 06

DropBall.java Uses a while loop to determine how long it takes a ball to fall from the top of the Washington Monument to the ground. #Programming Code Examples #Java/J2EE/J2ME #Basic Java 

/** Simulating dropping a ball from the top of the Washington
 *  Monument. The program outputs the height of the ball each
 *  second until the ball hits the ground.
 *
 *  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 DropBall {
  public static void main(String[] args) {
    int time = 0;
    double start = 550.0, drop = 0.0;
    double height = start;
    while (height > 0) {
      System.out.println("After " + time +
                   (time==1 ? " second, " : " seconds,") +
                   "the ball is at " + height + " feet.");
      time++;
      drop = freeFall(time);
      height = start - drop;
    }
    System.out.println("Before " + time + " seconds could " +
                       "expire, the ball hit the ground!");
  }

  /** Calculate the distance in feet for an object in
   *  free fall.
   */

  public static double freeFall (float time) {
    // Gravitational constant is 32 feet per second squared
    return(16.0 * time * time); // 1/2 gt^2
  }
}

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May 06

Creates three radio buttons and illustrates handling #Programming Code Examples #Java/J2EE/J2ME #Basic Swing 

JRadioButtonTest.java Creates three radio buttons and illustrates handling ItemEvents in response to selecting a radio button. 
import javax.swing.JRadioButton;
import javax.swing.ButtonGroup;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/** 
 */

public class JRadioButtonTest extends JPanel
                              implements ItemListener {

  public JRadioButtonTest() {
   
    String[] labels = {"Java Swing","Java Servlets",
                       "JavaServer Pages"};
    JRadioButton[] buttons = new JRadioButton[3];
    ButtonGroup group = new  ButtonGroup();

    for(int i=0; i<buttons .length; i++) {
      buttons[i] = new JRadioButton(labels[i]);
      buttons[i].setContentAreaFilled(false);
      buttons[i].addItemListener(this);
      group.add(buttons[i]);
      add(buttons[i]);
    }
  }

  public void itemStateChanged(ItemEvent event) {
    JRadioButton radiobutton = (JRadioButton)event.getItem();

    if (event.getStateChange() == ItemEvent.SELECTED) {
      System.out.println(radiobutton.getText() + " selected.");
    } else {
      System.out.println(radiobutton.getText() + " deselected.");
    }
  }

  public static void main(String[] args) {
    JPanel panel = new JRadioButtonTest();
    WindowUtilities.setNativeLookAndFeel();
    WindowUtilities.openInJFrame(panel, 400, 75);
  }
}

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May 06

Technical and Vocational Institute Summary Report

Technical and Vocational Institute Summary Report
Education levelManagementInstituteTeacherStudent
TotalFemaleTotalFemalTotalFemale
01 – POLYTECHNIC INSTITUTEPRIVATE35712475986859461887
PUBLIC57313891652717315960
02 -TECHNICAL SCHOOL AND COLLEGEPRIVATE845101622216257
PUBLIC370440651165183
03 – TEXTILE (Vocational Institute)PUBLIC27015634141
04 – TEXTILE TRAINING CENTERPRIVATE7401832052942263
PUBLIC2245929249292339
05 – AGRICULTURE TRAINING INSTITUTEPRIVATE5705027715960
PUBLIC809421
06 – TEXTILE INSTITUTEPRIVATE120135315023
PUBLIC10241
07 – NATIONAL SKILLPRIVATE1291119854572
PUBLIC103913
08 – H.S.C(Vocational Independent)PRIVATE1030
09 – H.S.C (B.M Independent)PRIVATE60061580912281607640
10 – SURVEY INSTITUTEPRIVATE1091
PUBLIC1050
11 – GRAPHIC ARTSPUBLIC10133
12 – S.S.C(Vocational Independent)PRIVATE1431177817213456
13 – GLASS AND CERAMICSPUBLIC10152
15 – HEALTH TECHNOLOGYPRIVATE53016938
PUBLIC30
17 – OTHERSPRIVATE1157112924437051217
PUBLIC2514985826471107
18 – DIPLOMA IN FISHERIESPRIVATE40
Total18141051754933046517830416

May 05

Simple example illustrating the use of check boxes #Programming Code Examples #Java/J2EE/J2ME #Basic Swing 

JCheckBoxTest.java Simple example illustrating the use of check boxes. 
import javax.swing.*; 
import java.awt.event.*;

 */

public class JCheckBoxTest extends JPanel 
                           implements ItemListener, 
                                      ActionListener{
  JCheckBox checkBox1, checkBox2;
   
  public JCheckBoxTest() {
    checkBox1 = new JCheckBox("Java Servlets");
    checkBox2 = new JCheckBox("JavaServer Pages");
    checkBox1.setContentAreaFilled(false);
    checkBox2.setContentAreaFilled(false);
   
    checkBox1.addItemListener(this);
    checkBox2.addActionListener(this);
      
    add(checkBox1);
    add(checkBox2);
  }
   
  public void actionPerformed(ActionEvent event) {
    System.out.println("JavaServer Pages selected: " + 
                        checkBox2.isSelected());
  }
   
  public void itemStateChanged(ItemEvent event) {
    JCheckBox checkbox = (JCheckBox)event.getItem();
      
    if (event.getStateChange() == ItemEvent.SELECTED) {
      System.out.println(checkbox.getText() + " selected.");
    } else {
      System.out.println(checkbox.getText() + " deselected.");
    }
  }  
   
  public static void main(String[] args) {
    JPanel panel = new JCheckBoxTest();
    WindowUtilities.setNativeLookAndFeel();
    WindowUtilities.openInJFrame(panel, 300, 75);
  }   
}

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May 05

Simple button that the user can select to load the entered URL. #Programming Code Examples #Java/J2EE/J2ME #Basic Swing 

JIconButton.java A simple button that the user can select to load the entered URL. 
import javax.swing.*;

/** A regular JButton created with an ImageIcon and with borders
 *  and content areas turned off.
 *
  */

public class JIconButton extends JButton {
  public JIconButton(String file) {
    super(new ImageIcon(file));
    setContentAreaFilled(false);
    setBorderPainted(false);
    setFocusPainted(false);
  }
}

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May 05

Basic tool bar for holding multiple buttons. #Programming Code Examples #Java/J2EE/J2ME #Basic Swing 

BrowserToolBar.java A basic tool bar for holding multiple buttons. 
import java.awt.*;
import javax.swing.*;

/** Part of a small example showing basic use of JToolBar.
 *  Creates a small dockable toolbar that is supposed to look
 *  vaguely like one that might come with a Web browser.
 *  Makes use of ToolBarButton, a small extension of JButton
 *  that shrinks the margins around the icon and puts text 
 *  label, if any, below the icon. 
 *
  */
 
public class BrowserToolBar extends JToolBar {
  public BrowserToolBar() { 
    String[] imageFiles =
      { "Left.gif", "Right.gif", "RotCCUp.gif",
        "TrafficRed.gif", "Home.gif", "Print.gif", "Help.gif" };
    String[] toolbarLabels =
      { "Back", "Forward", "Reload", "Stop", 
        "Home", "Print", "Help" };
    Insets margins = new Insets(0, 0, 0, 0);
    for(int i=0; i<toolbarlabels .length; i++) {
      ToolBarButton button =
        new ToolBarButton("images/" + imageFiles[i]);
      button.setToolTipText(toolbarLabels[i]);
      button.setMargin(margins);
      add(button);
    }
  }

  public void setTextLabels(boolean labelsAreEnabled) {
    Component c;
    int i = 0;
    while((c = getComponentAtIndex(i++)) != null) {
      ToolBarButton button = (ToolBarButton)c;
      if (labelsAreEnabled) {
        button.setText(button.getToolTipText());
      } else {
        button.setText(null);
      }
    }
  }
}

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May 05

A simple button that contains an image and a label for use in a toolbar #Programming Code Examples #Java/J2EE/J2ME #Basic Swing 

ToolBarButton.java A simple button that contains an image and a label for use in a toolbar. 
import java.awt.*;
import javax.swing.*;

/** Part of a small example showing basic use of JToolBar.
 *  The point here is that dropping a regular JButton in a
 *  JToolBar (or adding an Action) in JDK 1.2 doesn't give 
 *  you what you want -- namely, a small button just enclosing
 *  the icon, and with text labels (if any) below the icon,
 *  not to the right of it. In JDK 1.3, if you add an Action
 *  to the toolbar, the Action label is no longer displayed.
 *
  */

public class ToolBarButton extends JButton {
  private static final Insets margins =
    new Insets(0, 0, 0, 0);

  public ToolBarButton(Icon icon) {
    super(icon);
    setMargin(margins);
    setVerticalTextPosition(BOTTOM);
    setHorizontalTextPosition(CENTER);
  }

  public ToolBarButton(String imageFile) {
    this(new ImageIcon(imageFile));
  }

  public ToolBarButton(String imageFile, String text) {
    this(new ImageIcon(imageFile));
    setText(text);
  }
}

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May 05

mall example showing the basic use of a JToolBar #Programming Code Examples #Java/J2EE/J2ME #Basic Swing 

mall example showing the basic use of a JToolBar

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

/** Small example showing basic use of JToolBar. 
 *
 * 
 */

public class JToolBarExample extends JFrame
                             implements ItemListener {
  private BrowserToolBar toolbar;
  private JCheckBox labelBox;

  public static void main(String[] args) {
    new JToolBarExample();
  }

  public JToolBarExample() {
    super("JToolBar Example");
    WindowUtilities.setNativeLookAndFeel();
    addWindowListener(new ExitListener());
    Container content = getContentPane();
    content.setBackground(Color.white);
    
    JPanel panel = new JPanel(new BorderLayout());
    labelBox = new JCheckBox("Show Text Labels?");
    labelBox.setHorizontalAlignment(SwingConstants.CENTER);
    labelBox.addItemListener(this);
    panel.add(new JTextArea(10,30), BorderLayout.CENTER);
    panel.add(labelBox, BorderLayout.SOUTH);

    toolbar = new BrowserToolBar();
    content.add(toolbar, BorderLayout.NORTH);
    content.add(panel, BorderLayout.CENTER);

    pack();
    setVisible(true);
  }

  public void itemStateChanged(ItemEvent event) {
    toolbar.setTextLabels(labelBox.isSelected());
    pack();
  }
}

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May 05

Demonstrates the use of a JColorChooser which presents a dialog with three different tabbed panes to allow the user to select a color preference #Programming Code Examples #Java/J2EE/J2ME #Basic Swing 

Demonstrates the use of a JColorChooser which presents a dialog with three different tabbed panes to allow the user to select a color preference. The dialog returns a Color object based on the user's selection or null if the user entered Cancel. 

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

/** Simple example illustrating the use of internal frames. 
 *
 *   */

public class JInternalFrames extends JFrame {
  public static void main(String[] args) {
    new JInternalFrames();
  }

  public JInternalFrames() {
    super("Multiple Document Interface");
    WindowUtilities.setNativeLookAndFeel();
    addWindowListener(new ExitListener());
    Container content = getContentPane();
    content.setBackground(Color.white);
    JDesktopPane desktop = new JDesktopPane();
    desktop.setBackground(Color.white);
    content.add(desktop, BorderLayout.CENTER);
    setSize(450, 400);
    for(int i=0; i<5; i++) {
      JInternalFrame frame
        = new JInternalFrame(("Internal Frame " + i),
                             true, true, true, true);
      frame.setLocation(i*50+10, i*50+10);
      frame.setSize(200, 150);
      frame.setBackground(Color.white);
      frame.setVisible(true);
      desktop.add(frame);
      frame.moveToFront();
    }
    setVisible(true);
  }
}

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