Java codes for professional and beginners

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)); } }

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(aud...

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("Dis...

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....

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 c...

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

Four methods in the Applet class give you the framework on which you build any serious applet: init:  This method is intended for whatever initialization is needed for your applet. It is called after the param tags inside the applet tag have been processed. start:  This method is automatically called after the browser calls the init method. It is also called whenever the user returns to the page containing the applet after having gone off to other pages. stop:  This method is automatically called when the user moves off the page on which the applet sits. It can, therefore, be called repeatedly in the same applet. destroy:  This method is only called when the browser shuts down normally. Because applets are meant to live on an HTML page, you should not normally leave resources behind after a user leaves the page that contains the applet. paint:  Invoked immediately after the start() method, and also any time the applet needs to repaint itself in the browser....