Picture of the Frame

Although the class TestFrame1 has been defined it is not instantiated. The main() method is a static part of that class, not part of any object. Static methods of a class can be run without constructing an object of the class. Review the first chapter on objects (currently chapter 25) if this is unclear. Here is a picture of what is going on:

Although the main() method is static, it can ask to create an object (with new) and its variable frame can refer to that object in main memory.