# Creating a Standalone Java Boot Application (Without JAR)
Here's how to create a Java Swing application that simulates a boot process and can be run directly without needing a JAR file:
## Complete Implementation
```java
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class VirtualBoot {
public static void main(String[] args) {
// Create and show the boot screen
SwingUtilities.invokeLater(() -> {
BootScreen bootScreen = new BootScreen();
bootScreen.setVisible(true);
bootScreen.startBooting();
});
}
}
class BootScreen extends JFrame {
private JLabel bootLabel;
private JProgressBar progressBar;
private Timer timer;
private int progressValue = 0;
private String[] bootMessages = {
"Initializing virtual hardware...",
"Loading virtual BIOS...",
"Checking virtual memory...",
"Detecting virtual storage...",
"Loading virtual OS kernel...",
"Starting virtual services...",
"Preparing virtual environment...",
"Virtual boot complete!"
};
private int currentMessageIndex = 0;
public BootScreen() {
// Configure the window
setTitle("Virtual Machine Boot");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setUndecorated(true); // Remove window decorations
setExtendedState(JFrame.MAXIMIZED_BOTH); // Full screen
// Set black background
getContentPane().setBackground(Color.BLACK);
setLayout(new BorderLayout());
// Boot label with green text (classic terminal style)
bootLabel = new JLabel("", SwingConstants.CENTER);
bootLabel.setForeground(new Color(0, 255, 0)); // Green text
bootLabel.setFont(new Font("Courier New", Font.BOLD, 20));
add(bootLabel, BorderLayout.CENTER);
// Progress bar at bottom
progressBar = new JProgressBar(0, 100);
progressBar.setStringPainted(true);
progressBar.setForeground(new Color(0, 255, 0)); // Green
progressBar.setBackground(Color.BLACK);
progressBar.setFont(new Font("Courier New", Font.PLAIN, 12));
add(progressBar, BorderLayout.SOUTH);
// Create timer for boot animation (1.5 second intervals)
timer = new Timer(1500, e -> updateBootProgress());
}
private void updateBootProgress() {
// Update boot message
if (currentMessageIndex < bootMessages.length) {
bootLabel.setText(bootMessages[currentMessageIndex]);
currentMessageIndex++;
// Play beep sound for certain steps
if (currentMessageIndex == 1 || currentMessageIndex == 4) {
Toolkit.getDefaultToolkit().beep();
}
}
// Update progress (with some randomness)
progressValue += 8 + (int)(Math.random() * 8);
if (progressValue > 100) progressValue = 100;
progressBar.setValue(progressValue);
progressBar.setString("BOOT PROGRESS: " + progressValue + "%");
// When boot completes
if (progressValue >= 100) {
timer.stop();
// Show completion for 2 seconds then launch virtual desktop
new Timer(2000, e -> {
dispose();
launchVirtualDesktop();
}).start();
}
}
private void launchVirtualDesktop() {
VirtualDesktop desktop = new VirtualDesktop();
desktop.setVisible(true);
}
public void startBooting() {
timer.start();
}
}
class VirtualDesktop extends JFrame {
public VirtualDesktop() {
setTitle("Virtual Desktop Environment");
setSize(800, 600);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Create a simple desktop UI
JPanel desktop = new JPanel(new BorderLayout());
desktop.setBackground(new Color(0, 128, 128)); // Teal background
// Menu bar
JMenuBar menuBar = new JMenuBar();
JMenu systemMenu = new JMenu("System");
JMenuItem exitItem = new JMenuItem("Exit");
exitItem.addActionListener(e -> System.exit(0));
systemMenu.add(exitItem);
menuBar.add(systemMenu);
setJMenuBar(menuBar);
// Desktop content
JLabel welcomeLabel = new JLabel("Virtual Machine Ready", SwingConstants.CENTER);
welcomeLabel.setFont(new Font("Arial", Font.BOLD, 24));
welcomeLabel.setForeground(Color.WHITE);
desktop.add(welcomeLabel, BorderLayout.CENTER);
// Status bar
JPanel statusBar = new JPanel(new FlowLayout(FlowLayout.RIGHT));
statusBar.add(new JLabel("Virtual CPU: 2 cores | Memory: 4GB | Disk: 50GB"));
desktop.add(statusBar, BorderLayout.SOUTH);
add(desktop);
}
}
```
## How to Run Without JAR
1. **Save the code** as `VirtualBoot.java`
2. **Compile** with:
```
javac VirtualBoot.java
```
3. **Run** with:
```
java VirtualBoot
```
## Key Features
1. **Realistic Boot Sequence**:
- Simulated hardware initialization
- Progress percentage with random increments
- Classic terminal-style green text on black background
2. **Full Boot Process**:
- BIOS-like startup screen
- Progress bar showing boot status
- Automatic transition to virtual desktop
3. **Virtual Desktop**:
- Simple menu system
- System information display
- Clean teal-colored interface
4. **No JAR Required**:
- Runs directly from compiled class files
- No need for packaging or special execution
## Customization Options
1. **Change Boot Messages**:
```java
private String[] bootMessages = {
"Your custom message 1",
"Your custom message 2",
// etc...
};
```
2. **Add BIOS Logo**:
```java
// Add to BootScreen constructor
JLabel logoLabel = new JLabel("VIRTUAL BIOS v1.0", SwingConstants.CENTER);
logoLabel.setForeground(Color.CYAN);
logoLabel.setFont(new Font("Courier New", Font.BOLD, 28));
add(logoLabel, BorderLayout.NORTH);
```
3. **Add Sound Effects**:
```java
// Play beep at specific points in updateBootProgress()
if (currentMessageIndex == 2) {
Toolkit.getDefaultToolkit().beep();
}
```
4. **Make Boot Faster/Slower**:
```java
// Change the timer interval (milliseconds)
timer = new Timer(1000, e -> updateBootProgress()); // 1 second intervals
```
This implementation provides a complete virtual boot experience that runs as a standard Java application without requiring JAR packaging.
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