public class Main {
public static void main(String[] args) {
int[] intary = { 1,2,3,4};
forDisplay(intary);
foreachDisplay(intary);
}
public static void forDisplay(int[] a){
System.out.println("Display an array using for loop");
for (int i = 0; i < a.length; i++) {
System.out.print(a[i] + " ");
}
System.out.println();
}
public static void foreachDisplay(int[] data){
System.out.println("Display an array using for
each loop");
for (int a : data) {
System.out.print(a+ " ");
}
}
}Sunday, January 8, 2012
How to use for and foreach loops to display elements of an array.
How to use method overloading for printing different types of array ?
public class MainClass {
public static void printArray(Integer[] inputArray) {
for (Integer element : inputArray){
System.out.printf("%s ", element);
System.out.println();
}
}
public static void printArray(Double[] inputArray) {
for (Double element : inputArray){
System.out.printf("%s ", element);
System.out.println();
}
}
public static void printArray(Character[] inputArray) {
for (Character element : inputArray){
System.out.printf("%s ", element);
System.out.println();
}
}
public static void main(String args[]) {
Integer[] integerArray = { 1, 2, 3, 4, 5, 6 };
Double[] doubleArray = { 1.1, 2.2, 3.3, 4.4,
5.5, 6.6, 7.7 };
Character[] characterArray = { 'H', 'E', 'L', 'L', 'O' };
System.out.println("Array integerArray contains:");
printArray(integerArray);
System.out.println("\nArray doubleArray contains:");
printArray(doubleArray);
System.out.println("\nArray characterArray contains:");
printArray(characterArray);
}
}How to display name of the months in short format?
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);
}
}
}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> |
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