Source code in a .java file is compiled into a .class file.
What does this .class file contain?
* machine code
* a virtual machine
* libraries
** byte code
* garbage


public class Jibberish {
  int foo;
}

What is foo in this example?
* a parameter
** an instance variable
* a local variable
* a method

public class Example{
  public boolean foo() { ... }
  public void foo(int a) { ... }
}
 
This an example of:
** over-loading
* over-riding
* over-extending
* over-reaching
* duplicating