What is the difference between superclass and subclass?

What is the difference between abstract class and interface?

Why Java does not support multiple inheritances

What is the difference between a break statement and a continue statement

What are the secondary access modifiers?

What is shadowing?

Can an abstract class be final?

What is a platform?

Can Java code be compiled to machine dependent executable file?

Why classes in java are immutable?

What is the difference between static and non static variables?