How to run a java file from different directory to include all of the output from where i need to build the Dockerfile?

Question

I have a java file inside JavaFile directory from the below screenshot and want to run that java file from other directory (i.e) from

C:\Priyanka\Docker-AppCodes\java-docker-app

My java file is present inside the JavaFile Folder. How should I run the java file. I am using the command

RUN javac JavaFile/Hello.java 

to run in DockerFile. My Java File Hello.java contains the below code.

class Hello{  
    public static void main(String[] args){  
        System.out.println("This is java app \n by using Docker");  
    }  
} 

But I am receiving the File not Found Error. Please help me to resolve this.

The Docker file contains the below code:

FROM java:8  
COPY . /var/www/java  
WORKDIR /var/www/java  
RUN javac JavaFile/Hello.java  
CMD ["java", "Hello"]