How to run a Java project from command prompt

Question

I have source code for QR code generation using Java.

I don't know how to run Java in command prompt.

two jar files

E:\QR Code\lib\core-2.2.jar

E:\QR Code\lib\javase-2.2.jar

Java code path

E:\QR Code\src\com\javapapers\java\QRCode.java

Source code

http://javapapers.com/core-java/java-qr-code

Explain me how to run the java in command prompt

Regards Karthikeyan K

Answer 1

To make sure that Windows can find the Java compiler and interpreter:

1. Select Start -> Computer -> System Properties -> Advanced system settings Environment Variables -> System variables -> PATH. ...

2. Prepend C:\Program Files\Java\jdk1.6.0_27\bin; to the beginning of the PATH variable.

   Click OK

Then open command prompt and check if Java path setup done by below command

java -version

If everything ok it will show you which Java version you have installed .

then you can run java program Like below a example

C:\test> javac HelloWorld.java

I have test folder and it have HelloWorld.java file inside it after this

C:\test> java HelloWorld

It will give you output in my file i have added below content

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