Java Imp Points

• Abstraction is a Hiding the implementation details and showing only functionality to user .
• Encapsulation hides the data .
• we cannot use any abstract method without abstract class .
• we cannot use final in abstract method , because , abstract method needs  overridden and we cannot override the final .
• Not possible to instantiate the abstract class .
• Interface is a blue print of a class that have static constants and abstract methods. It can be used to achieve fully abstraction and multiple inheritance . 
• we cannot use interface as final .
• Marker interface don't have data member and method . eg . serializable , cloneable etc .