Running a Java Program (Review)

If you are running Java programs using BlueJ or some other environment, or using an OS other than Windows, skip this page.

Copy and paste the example program into a text editor (like Notepad or Notepad++), and then save it to a file called Hello.java in the current directory. (Microsoft calls "directories" by the name "folders".)

To run the program, check that the default directory of the command interpreter contains the source file. Do this by using the command DIR *.java to list the files in the directory. One of the files should be Hello.java. To see all the files, just type the command DIR.

C:\JavaSource>DIR *.java
 Volume in drive C has no label.
 Volume Serial Number is 7C68-1E55

 Directory of C:\JavaSource

 08/23/98  01:07a                   115 Hello.java
               1 File(s)            115 bytes
                          2,448,368,640 bytes free

If you don't see the source file, use the Change Directory command CD to get to the correct subdirectory. To compile the source file (thereby producing a file of bytecodes) enter the command javac Hello.java. Finally, to run it, enter the command java Hello.

C:\JavaSource>javac Hello.java
  compiling: Hello.java

C:\JavaSource>java Hello

Hello World!

C:\JavaSource>