import java.text.SimpleDateFormat;
import java.text.DateFormatSymbols;
public class Main {
public static void main(String[] args) {
String[] shortMonths = new DateFormatSymbols()
.getShortMonths();
for (int i = 0; i < (shortMonths.length-1); i++) {
String shortMonth = shortMonths[i];
System.out.println("shortMonth = " + shortMonth);
}
}
}Sunday, January 8, 2012
How to display name of the months in short format?
How to format time in AM-PM format?
import java.text.SimpleDateFormat;
import java.util.Date;
public class Main{
public static void main(String[] args){
Date date = new Date();
String strDateFormat = "HH:mm:ss a";
SimpleDateFormat sdf = new SimpleDateFormat(strDateFormat);
System.out.println(sdf.format(date));
}
}Playing Audio:
An applet can play an audio file represented by the AudioClip interface in the java.applet package. The AudioClip interface has three methods, including:
- public void play(): Plays the audio clip one time, from the beginning.
- public void loop(): Causes the audio clip to replay continually.
- public void stop(): Stops playing the audio clip.
To obtain an AudioClip object, you must invoke the getAudioClip() method of the Applet class. The getAudioClip() method returns immediately, whether or not the URL resolves to an actual audio file. The audio file is not downloaded until an attempt is made to play the audio clip.
Following is the example showing all the steps to play an audio:
import java.applet.*;
import java.awt.*;
import java.net.*;
public class AudioDemo extends Applet
{
private AudioClip clip;
private AppletContext context;
public void init()
{
context = this.getAppletContext();
String audioURL = this.getParameter("audio");
if(audioURL == null)
{
audioURL = "default.au";
}
try
{
URL url = new URL(this.getDocumentBase(), audioURL);
clip = context.getAudioClip(url);
}catch(MalformedURLException e)
{
e.printStackTrace();
context.showStatus("Could not load audio file!");
}
}
public void start()
{
if(clip != null)
{
clip.loop();
}
}
public void stop()
{
if(clip != null)
{
clip.stop();
}
}
}
|
Now let us call this applet as follows:
<html> <title>The ImageDemo applet</title> <hr> <applet code="ImageDemo.class" width="0" height="0"> <param name="audio" value="test.wav"> </applet> <hr> </html> |
Displaying Images:
An applet can display images of the format GIF, JPEG, BMP, and others. To display an image within the applet, you use the drawImage() method found in the java.awt.Graphics class.
Following is the example showing all the steps to show images:
import java.applet.*;
import java.awt.*;
import java.net.*;
public class ImageDemo extends Applet
{
private Image image;
private AppletContext context;
public void init()
{
context = this.getAppletContext();
String imageURL = this.getParameter("image");
if(imageURL == null)
{
imageURL = "java.jpg";
}
try
{
URL url = new URL(this.getDocumentBase(), imageURL);
image = context.getImage(url);
}catch(MalformedURLException e)
{
e.printStackTrace();
// Display in browser status bar
context.showStatus("Could not load image!");
}
}
public void paint(Graphics g)
{
context.showStatus("Displaying image");
g.drawImage(image, 0, 0, 200, 84, null);
g.drawString("www.javalicense.com", 35, 100);
}
}
|
Now let us call this applet as follows:
<html> <title>The ImageDemo applet</title> <hr> <applet code="ImageDemo.class" width="300" height="200"> <param name="image" value="java.jpg"> </applet> <hr> </html> |
Event Handling: Applet
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.applet.Applet;
import java.awt.Graphics;
public class ExampleEventHandling extends Applet
implements MouseListener {
StringBuffer strBuffer;
public void init() {
addMouseListener(this);
strBuffer = new StringBuffer();
addItem("initializing the apple ");
}
public void start() {
addItem("starting the applet ");
}
public void stop() {
addItem("stopping the applet ");
}
public void destroy() {
addItem("unloading the applet");
}
void addItem(String word) {
System.out.println(word);
strBuffer.append(word);
repaint();
}
public void paint(Graphics g) {
//Draw a Rectangle around the applet's display area.
g.drawRect(0, 0,
getWidth() - 1,
getHeight() - 1);
//display the string inside the rectangle.
g.drawString(strBuffer.toString(), 10, 20);
}
public void mouseEntered(MouseEvent event) {
}
public void mouseExited(MouseEvent event) {
}
public void mousePressed(MouseEvent event) {
}
public void mouseReleased(MouseEvent event) {
}
public void mouseClicked(MouseEvent event) {
addItem("mouse clicked! ");
}
}
|
Now let us call this applet as follows:
<html> <title>Event Handling</title> <hr> <applet code="ExampleEventHandling.class" width="300" height="300"> </applet> <hr> </html> |
Application Conversion to Applets:
It is easy to convert a graphical Java application (that is, an application that uses the AWT and that you can start with the java program launcher) into an applet that you can embed in a web page.
Here are the specific steps for converting an application to an applet.
- Make an HTML page with the appropriate tag to load the applet code.
- Supply a subclass of the JApplet class. Make this class public. Otherwise, the applet cannot be loaded.
- Eliminate the main method in the application. Do not construct a frame window for the application. Your application will be displayed inside the browser.
- Move any initialization code from the frame window constructor to the init method of the applet. You don't need to explicitly construct the applet object.the browser instantiates it for you and calls the init method.
- Remove the call to setSize; for applets, sizing is done with the width and height parameters in the HTML file.
- Remove the call to setDefaultCloseOperation. An applet cannot be closed; it terminates when the browser exits.
- If the application calls setTitle, eliminate the call to the method. Applets cannot have title bars. (You can, of course, title the web page itself, using the HTML title tag.)
- Don't call setVisible(true). The applet is displayed automatically.
The Applet CLASS:
Every applet is an extension of the java.applet.Applet class. The base Applet class provides methods that a derived Applet class may call to obtain information and services from the browser context.
These include methods that do the following:
- Get applet parameters
- Get the network location of the HTML file that contains the applet
- Get the network location of the applet class directory
- Print a status message in the browser
- Fetch an image
- Fetch an audio clip
- Play an audio clip
- Resize the applet
Additionally, the Applet class provides an interface by which the viewer or browser obtains information about the applet and controls the applet's execution. The viewer may:
- request information about the author, version and copyright of the applet
- request a description of the parameters the applet recognizes
- initialize the applet
- destroy the applet
- start the applet's execution
- stop the applet's execution
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