How do you find the .class file?

Answer 1

In cmd:
javac address:/to/the/file.java

This will create the .class file in the same location as your Java file.

Answer 2

Go into your workspace folder, then click the project you want, then click the "bin" directory. all the .class files for that project should be there

Answer 3

if you use the command line to compile your .java file, the .class file will be created in the same directory as the .java file.

if you use an ide like eclipse to compile your .java file, the .class file will be in the bin folder inside your project directory.