How to create a Java Program with two classes in the playground

Question

I have a Test-class that creates different instances of my OBJECT-class, but if I run the program it cant find the OBJECT-class.
Besides: I have to put the classes separated because of an Interface I'm using.

Answer 1

You have to put them in one file at playground, like fghhj said, before he edited his post :D

Answer 2

You mean in playground or ide?
Ide: You have to import your class to the class where it is used, if it is stored in another package:
import mypackagePath.myClass;
Make sure your .java file is named like your class, e.g. myClass.java

Answer 3

oh