paidedly questions

• If there's only one thread running(main) and sleep(1000) is invoked, will the thread sleep for exactly 1 second or atleast 1 second?
• illegal reference to static field from initializer
• Why do I need to provide enclosing class object but not enclosed class object
• How does javac automatically compile dependencies of a class
• Why does compiling a class containing static nested classes create a new .class file named "EnclosingClass$1"? [duplicate]
• Why isn't a final variable always a constant expression?

paidedly answers