Programming with Java using Notepad

EXAMPLE : ReversedString

Output

Programming in Java using Notepad is a simple way to get started with Java development without the need for an Integrated Development Environment (IDE). Below is a step-by-step guide to writing, compiling, and running a Java program using Notepad:

Step 1: Install Java Development Kit (JDK)

1. Download and install the latest version of the JDK from the Oracle website or OpenJDK.
2. During installation, note the installation directory (e.g., C:\Program Files\Java\jdk-XX.X.X).
3. Set up the Environment Variables:
   • Add the bin directory of the JDK to the PATH variable:
     • Go to Control Panel > System > Advanced System Settings > Environment Variables.
     • Under "System Variables," find Path, click Edit, and add the path to the JDK's bin folder (e.g., C:\Program Files\Java\jdk-XX.X.X\bin).
4. Verify the installation:
   • Open Command Prompt and type:
     1java -version
     2

     You should see the installed Java version.

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Step 2: Write a Java Program

1. Open Notepad (or any text editor).
2. Write your Java code. For example, a simple "Hello, World!" program:
   1public class HelloWorld {
   2    public static void main(String[] args) {
   3        System.out.println("Hello, World!");
   4    }
   5}
   6

3. Save the file with a .java extension:
   • File name must match the class name (e.g., HelloWorld.java).
   • Save it in a directory of your choice (e.g., C:\JavaProjects).

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Step 3: Compile the Java Program

1. Open Command Prompt.
2. Navigate to the directory where you saved the .java file:
   1cd C:\JavaProjects
   2

3. Compile the Java program using the javac command:
   1javac HelloWorld.java
   2

   • If there are no errors, this will generate a HelloWorld.class file in the same directory.

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Step 4: Run the Java Program

1. Run the compiled program using the java command:
   1java HelloWorld
   2

2. You should see the output:
   1Hello, World!
   2

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Tips and Best Practices

• Indentation and Formatting: Use proper indentation to make your code readable.
• Error Handling: If you encounter errors during compilation, carefully read the error messages to identify and fix issues.
• Use Notepad++: For a better experience, consider using Notepad++, which provides syntax highlighting and other helpful features for coding.

Example Workflow

1. Write the program in Notepad:
   1public class MyProgram {
   2    public static void main(String[] args) {
   3        System.out.println("Java programming is fun!");
   4    }
   5}
   6

2. Save it as MyProgram.java.
3. Open Command Prompt, navigate to the file's directory, and compile it:
   1javac MyProgram.java
   2

4. Run the program:
   1java MyProgram
   2

   Output:
   1Java programming is fun!
   2

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By following these steps, you can successfully write, compile, and run Java programs using Notepad