S01L01 – New – Java versions and Setting up enviroment

Code Explanation

1. Class Declaration:
   
   Java

   public class HelloWorld {

   1	public class HelloWorld {

   
   Defines a public class named HelloWorld.
2. Main Method:
   
   Java

   public static void main(String[] args) {

   1	public static void main(String[] args) {

   
   The entry point of the application.
3. Printing to Console:
   
   Java

   System.out.println("Hello and Welcome!");

   1	System.out.println("Hello and Welcome!");

   
   Outputs the string "Hello and Welcome!" to the console.

Program Output

Creating Your First Project

SEO-Optimized Title: Creating Your First Java Project in IntelliJ IDEA: A Beginner's Guide

With IntelliJ IDEA and JDK set up, you're ready to create your first Java project. Follow these steps to get started.

1. Start a New Project:
   • Open IntelliJ IDEA.
   • Click on "Start a New Project."
2. Configure Project Settings:
   • Project Name: Enter a meaningful name, e.g., HelloWorld.
   • Project Location: Choose a directory where your project files will reside.
   • JDK Selection: Ensure Java 17 is selected as the project SDK.
3. Project Structure:
   • IntelliJ IDEA will create the necessary directory structure, including src for source files.
4. Adding Source Code:
   • Right-click on the src folder.
   • Navigate to New > Java Class and name it HelloWorld.
5. Writing Your First Program:
   • Paste the sample code provided earlier into the HelloWorld.java file.
6. Building the Project:
   • Click on Build > Build Project or press Ctrl + F9 to compile your code.

Switching to Classic UI

SEO-Optimized Title: How to Switch Back to Classic UI in IntelliJ IDEA: Easy Steps

If you're more comfortable with the traditional IntelliJ IDEA interface, you can switch back to the Classic UI. Here's how:

1. Accessing UI Settings:
   • Go to File > Settings or press Ctrl + Alt + S to open the Settings dialog.
2. Navigating to Appearance:
   • In the Settings dialog, select Appearance & Behavior > Appearance.
3. Selecting Classic Theme:
   • Under the "UI Options", look for the "Theme" dropdown.
   • Select "Classic" from the list of available themes.
4. Applying Changes:
   • Click "Apply" and then "OK" to confirm the changes.
   • IntelliJ IDEA will refresh the interface, reverting to the Classic UI layout.

Benefits of Classic UI

• Familiar Layout: Easier transition for long-time users.
• Simplified Navigation: Less cluttered interface focusing on essential tools.
• Enhanced Stability: Fewer UI changes mean more predictable performance.

Running Your First Application

SEO-Optimized Title: Running Java Applications in IntelliJ IDEA: Step-by-Step Execution Guide

With your first Java project set up, it's time to run your application and see it in action.

1. Locating the Main Method:
   • Open the HelloWorld.java file.
   • Ensure the main method is correctly defined.
2. Running the Application:
   • Click on the Run button (green triangle) in the toolbar.
   • Alternatively, right-click inside the editor and select Run 'HelloWorld.main()'.
3. Building the Jar File:
   • IntelliJ IDEA will compile your code and build the corresponding .jar file.
   • The build process is visible in the Build window at the bottom.
4. Viewing the Output:
   • Once the build is successful, the output window will display:
     
     Java

     Hello and Welcome!

     1	Hello and Welcome!

5. Troubleshooting:
   • If you encounter errors, ensure that:
     • The JDK is correctly configured.
     • The project structure is properly set up.
     • There are no syntax errors in your code.

Sample Output Explanation

- This output confirms that your Java application has successfully executed the System.out.println statement, displaying the welcome message in the console.

Conclusion

Congratulations! You've successfully navigated the installation and setup process of IntelliJ IDEA, configured the Java Development Kit, and ran your first Java application. Mastering these foundational steps sets the stage for more advanced Java development and projects.

Key Takeaways

• IntelliJ IDEA is a powerful IDE that enhances Java development with its robust features and user-friendly interface.
• Setting Up JDK: Proper configuration of the Java Development Kit is crucial for compiling and running Java applications.
• Navigating the UI: Familiarity with both the Classic and New UI layouts helps in optimizing your development workflow.
• Creating Projects: Understanding the project structure and setup ensures efficient project management and development.

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Embark on your Java development journey with confidence, utilizing IntelliJ IDEA's comprehensive tools and features to build robust applications. Stay tuned for more advanced tutorials and guides to elevate your programming skills!