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Getting Started

JDK Installation on Windows

  1. Visit JDK Download: Go to the Java SE Downloads page.
  2. License Agreement: Accept the Oracle License Agreement.
  3. Download for Windows: Click the Download link for the Windows .exe file.
  4. Run Installer: Execute the downloaded installer.
  5. Installation Steps: Follow the on-screen instructions.
  6. Installation Path: The default installation path is C:\Program Files\Java\jdk-<FEATURE>.

Visual Studio Code Installation on Windows

  1. Download VS Code: Get the Visual Studio Code installer for Windows.
  2. Run Installer: Execute the downloaded installer.
  3. Installation Path: The default path is C:\Users\{Username}\AppData\Local\Programs\Microsoft VS Code.
  4. Java Extension Pack: Install the Extension Pack for Java in VS Code.

Create a 'Hello World' Project

  1. Open Visual Studio Code: Start VS Code.
  2. Command Palette: Open it by pressing Ctrl + Shift + P.
  3. Create Java Project: Type Java: Create Java Project and select it.
  4. Project Setup: Choose No build tools.
  5. Project Name: Name your project HelloWorld and choose a save location.

Understanding the Project Hierarchy

  • HelloWorld/ (Main Folder): The root folder of the project.
  • README.md: Provides an overview of the project.
  • .vscode/: Contains VS Code-specific configurations.
  • lib/: Stores external libraries and dependencies.
  • src/: Holds the main source code files.

Key Files and Folders

  • settings.json: Configuration settings for the Java project in VS Code.
  • App.java: The main Java class file for the application.

settings.json Explained

{
    "java.project.sourcePaths": ["src"],
    "java.project.outputPath": "bin",
    "java.project.referencedLibraries": ["lib/**/*.jar"]
}
  • Source Paths: Specifies the directory (src) containing Java source files.
  • Output Path: Defines bin as the directory for compiled Java files.
  • Referenced Libraries: Includes all .jar files in the lib folder.

App.java Explained

public class App {
    public static void main(String[] args) throws Exception {
        System.out.println("Hello, World!");
    }
}

Code Explanation:

  • public class App: Defines a public class named App.
  • public static void main(String[] args) throws Exception: The program's entry point.
  • System.out.println("Hello, World!");: Prints "Hello, World!" to the console.

Running 'Hello World'

Run the Program:

  • Right-click in the App.java file.
  • Select Run Java.
  • The output "Hello, World!" appears in VS Code's terminal.

Assignments

Overview

You are to modify the App.java file to achieve different levels of output complexity. Choose between easy, medium, and hard assignments as per your confidence level.

Easy Assignment

  • Objective: Modify App.java to output "Hello, Java!".
  • Hint: Focus on changing the string within the System.out.println method.
  • Expected Output: 
    Hello, Java!

Medium Assignment

  • Objective: Alter App.java to print "Hello," on one line and "Java!!" on the next.
  • Expected Output: 
    Hello,
Java!!

Hard Assignment

  • Objective: Modify App.java to output "Hello," on the first line, "Java" on the second line, and "World!!" on the third line.
  • Expected Output: 
    Hello,
Java
World!!