Which JRE am I using?

Question

There are two varieties of JRE available. Java VM: IBM vs. Sun.

Is there a way to know which JRE I am using through JavaScript or some Java issued command.

Answer 1

1. Open up your:
   • command prompt if you're using Windows
   • terminal if you're using mac or Linux

2. Type in:

   java -version // This will check your JRE version
   javac -version // This will check your Java compiler version if you installed the JDK
   

3. Grab a cup of coffee and you're done! You don't need to add the .exe to the java -version if everything is installed correctly.