Java installation - doesn't run classes

I am starting java development. So, I have installed JRE and JDK on my computer.

Then I created a simple Example.java file and saved it to my desktop. At the invitation, I performed

javac Example.java

and it worked fine. A file was created on my desktop .class

.

Then I tried to start the class by doing the following:

java Example

and I got an error in the warning box:

Java Installation Not Completed
Unable to install Java
There are error in the command line switches: "Example";.
Check that the commands are valid and try again

      

        
        
        
      

    

Then, for testing, I ran both commands: javac -version

and java -version

. Both are installed on my computer.

What am I doing wrong?

I am running Windows 8 and have already set my environment variables.

Example.java:

public class Example {   
  public static void main(String args[]) {    
    System.out.println("Finally Java");  
  }
}