Now we learn how to execute java file in Ubuntu and any Linux OS

• Firstly open the TERMINAL.
• Then go to the folder which contain the Java file. With cd command
  
• This command enter you into the Desktop.
• After that we go in the folder which is situated on the Desktop. like on my Desktop Java folder is created.

 

• After that we compile the Java file with javac command.
• After the compilation new file is automatically created in same folder with .class extension. 
• In my Java folder I created Java file with name demo.java extension. 

 

• Now we execute the Java file with java command like that and make shore the name of class write whose contain the main method.
• That name is put which .class extension is used.

 

• And now you can run the Java file in ubuntu and same Procedure is follow to run Java file in any Linux OS