Compile & Execute Basic Java Program in Command Prompt |First Java Program | How to Run Java Program

Pubblicato il: 17 maggio 2024
sul canale di: Engineering Unplugged

Here's a detailed description for a tutorial on compiling and executing a basic Java program using the command prompt:

Compiling and Executing a Basic Java Program in Command Prompt

In this tutorial, we will walk you through the process of writing, compiling, and executing a basic Java program using the command prompt. This fundamental skill is essential for understanding how Java code is transformed into executable programs.

#### Steps Covered:

1. **Writing Your First Java Program**:
Open a text editor and write a simple Java program.
Save the file with a `.java` extension.

Example:
```java
// HelloWorld.java
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
```

2. **Setting Up the Environment**:
Ensure that the Java Development Kit (JDK) is installed on your system.
Verify the installation by running `java -version` and `javac -version` in the command prompt.

3. **Compiling the Java Program**:
Open the command prompt.
Navigate to the directory where your Java file is saved.
Compile the program using the `javac` command.

Command:
```sh
javac HelloWorld.java
```

This command will generate a `HelloWorld.class` file in the same directory.

4. **Executing the Java Program**:
Run the compiled Java program using the `java` command.

Command:
```sh
java HelloWorld
```

You should see the output: `Hello, World!`

#### Key Points:
**File Naming**: Ensure your Java file name matches the public class name.
**Directory Navigation**: Use `cd` command to change directories in the command prompt.
**Compilation**: The `javac` command converts your `.java` file into bytecode (`.class` file).
**Execution**: The `java` command runs the bytecode on the Java Virtual Machine (JVM).

By following these steps, you'll learn how to manually compile and run Java programs, a crucial step in understanding the Java development process.

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