Java Applet Programming Quick Guide

Introduction

Java Applet Programming Quick Guide Dive into Java applets—tiny, powerful programs that once brought life to web pages with interactive magic! Running inside your browser, they used Java to create dynamic content. Though now rare, applets paved the way for todays web experiences!

Java Applet Code Examples with Output

Image Source: google

This section explains how to create and run a simple Java applet, including a code example and the steps required to execute it.

1. Example: Simple Java Applet to Display a Message

   • Demonstrates a basic Java applet program.

   • Typically uses the Applet class and overrides methods like paint(Graphics g) to display messages.

   • Example code may include:

     import java.applet.Applet;
     import java.awt.Graphics;
     
     public class HelloApplet extends Applet {
         public void paint(Graphics g) {
             g.drawString("Hello, Java Applet!", 50, 50);
         }
     }

2. Steps to Run the Java Applet

   • Step 1: Write the code in a .java file and compile it using javac.

   • Step 2: Create an HTML file to embed the applet using the <applet> tag (or <object>/<embed> in newer versions).

   • Step 3: Use an applet viewer or compatible browser to run the HTML file.

   • Example HTML snippet:

     <applet code="HelloApplet.class" width="300" height="200">
     </applet>

3. Note

   • Java applet support is deprecated in modern browsers.
   • Applets can still be tested using the appletviewer tool provided by JDK.

Stages in the Java Applet Life Cycle

Image Source: google

Explore Java services in Hexadecimal Software

Initialization to Termination Process

📘 Java Applet Programming Quick Guide

This process describes the five main stages that a Java applet goes through from beginning to end.

1. 🟢 init() – Initialization

• Called once when the applet is loaded.
• Used for setting up initial configurations.

2. ▶️ start() – Start

• Called after init() and every time the applet becomes active.
• Ideal for starting animations or threads.

3. 🎨 paint(Graphics g) – Paint

• Used to draw content on the applet window.
• Automatically called after start() or when refreshing.

4. ⏸️ stop() – Stop

• Called when the applet is not active or minimized.
• Stops ongoing activities like threads.

5. ❌ destroy() – Termination

• Final stage before the applet is removed from memory.
• Used for releasing resources or cleanup.

Java Applet Programming Quick Guide helps you understand how applets are structured and executed from start to finish.

Need help for Hire Java Developers?

Talk to an Expert

Types of Java Applets

Image Source: google

For Hire Java Developer Services

Creating a Simple Java Applet

📘 Java Applet Programming Quick Guide

This section explains the steps to create, compile, and run a basic Java applet.

1. 📝 Write the Applet Code

• Create a .java file using Applet class.
• Override methods like init() or paint(Graphics g).

2. 🧮 Compile the Code

• Use javac to compile the source file.
• Example: javac HelloApplet.java

3. 🌐 Create an HTML File

• Embed the compiled .class file using the <applet> tag.

• Example:

  <applet code="HelloApplet.class" width="300" height="200"></applet>

4. 🔍 Run the Applet

• Use appletviewer or a compatible browser to test.
• Example: appletviewer HelloApplet.html

📘 Java Applet Programming Quick Guide ensures beginners learn each step clearly—from writing code to running an applet smoothly.

You Might Also Like

Java Thread Lifecycle Complete Beginners Guide

By Hexadecimal Software Team

on 2025-04-21

Java vs Python: Robust vs Rapid

By Hexadecimal Software Team

on 2025-04-24

Kotlin’s Advantages Over Java in Modern App Development

By Hexadecimal Software Team

on 2025-04-04

Integrated Development Environment For Java

By Hexadecimal Software Team

on 2025-04-12

Java Applet Architecture

For the Mobile App Development Services

Applet Execution Flow

📘 Java Applet Programming Quick Guide

Applet execution flow refers to the sequence of method calls that control the applet’s behavior from loading to termination.

1. 🔁 Load Phase

• Browser or applet viewer loads the applet class.
• Triggers the execution of the init() method.

2. ▶️ Start Phase

• After initialization, the start() method is called.
• Begins execution like animations or background tasks.

3. 🖌️ Paint Phase

• The paint(Graphics g) method is called to display output.
• Automatically invoked when the applet needs redrawing.

4. ⏸️ Stop Phase

• When the applet is paused (e.g., window minimized), stop() is called.
• Pauses any ongoing processes.

5. ❌ Destroy Phase

• Before closing, destroy() is invoked to release resources.

📘 Java Applet Programming Quick Guide helps you understand this flow clearly so you can build efficient and responsive applets.

Initialization Methods in Applets

For the IOS App Development Services

Starting and Stopping an Applet

📘 Java Applet Programming Quick Guide

This section explains how an applet begins execution and how it pauses or stops based on user interaction or browser events.

1. ▶️ start() – Starting the Applet

• Invoked after init() or when the applet becomes active.
• Used to start animations, threads, or media playback.

2. ⏸️ stop() – Stopping the Applet

• Called when the user navigates away or minimizes the browser window.
• Used to pause tasks, save data, or free up resources.

3. ♻️ Repeated Calls

• start() and stop() may be called multiple times during the applet's life.
• Helps manage the applet's behavior based on visibility.

📘 Java Applet Programming Quick Guide ensures a clear understanding of how to manage applet activity efficiently for smooth user interaction.

Professional Backend Web Development Services

Rendering and Cleanup Processes

Do You Want to Hire Expert Java Developers?

Explore Our Services

Other Useful Applet Methods

Java Applet Programming Quick Guide

Besides the main applet methods (init(), start(), stop(), destroy()), these methods are also helpful:

• getCodeBase()

• Gets the URL where the applet code is stored.

• getDocumentBase()

• Gets the URL of the web page showing the applet.

• getParameter(String name)

• Gets a value from the applet’s HTML parameters.

• getWidth() and getHeight()

• Get the applet’s current width and height.

• showStatus(String message)

• Shows a message in the browser’s status bar.

• resize(int width, int height)

• Changes the size of the applet window.

FAQs

Q.1. What is a Java applet?

Q.2. How is an applet different from a normal Java program?

Q.3. What are the main applet methods?

Q.4. How do you run an applet?

Q.5. Can applets access your computer files?

Q.6. What does getParameter() do?

Q.7. Is Java applet still used?

Q.8. What is showStatus() for?