Hey guys in this post, we will about how to write Java program in Notepad and run it from command line.
Table of Contents
Install Java JDK on your System
First we need to install Java JDK on your system, at the time writing this blogpost, latest version of Java JDK is 16. You can download the Jdk from the following link
https://www.oracle.com/java/technologies/javase-downloads.html
Add Java to System Environment Variables
Next we need to add java to the environment variables. Open your system environment variables, Create variable under System variables
Next edit the Path
variable and give reference to the JAVA_HOME
path
Next check the java version from command prompt
If you see the java version then you are good to go
Create Java Program in Notepad
Open notepad and add the following java code
class HelloWorld {
public static void main(String[] args) {
System.out.println("HelloWorld");
}
}
Save the file in any of the directory. Make sure to give file name as class name. For ex: If you are class name is HelloWorld
then give name as HelloWorld.java
Compile the Program
Open the command prompt and go the directory where you have saved the java file. execute the following command to compile the java file.
C:\workspace\java-workspace>javac HelloWorld.java
this will convert java code into byte code and created a new file HelloWorld.class
. If there are any errors then it will show the errors in the console.
Run the Program
To run the java program enter the following command from the root of the directory, make sure that the .class file should also be present in the same directory
C:\workspace\java-workspace>java HelloWorld
You can see the output inside the console.
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