Java Core Java - Technical Questions and Answers

51.	Can a class be defined inside an Interface?
	Answer: Yes it's possible. Workspace Report errors ... Name : Email: View Answer

52.	Can an Interface be defined inside a class?
	Answer: Yes it's possible. Workspace Report errors ... Name : Email: View Answer

53.	What is a Marker Interface?
	Answer: An Interface which doesn't have any declaration inside but still enforces a mechanism. Workspace Report errors ... Name : Email: View Answer

54.	Which object oriented Concept is achieved by using overloading and overriding?
	Answer: Polymorphism. Workspace Report errors ... Name : Email: View Answer

55.	Why does Java not support operator overloading?
	Answer: Operator overloading makes the code very difficult to read and maintain. To maintain code simplicity, Java doesn't support operator overloading. Workspace Report errors ... Name : Email: View Answer

56.	Can we define private and protected modifiers for variables in interfaces?
	Answer: No. Workspace Report errors ... Name : Email: View Answer

57.	What is Externalizable?
	Answer: Externalizable is an Interface that extends Serializable Interface. And sends data into Streams in Compressed Format. It has two methods, writeExternal(ObjectOuput out) and readExternal(ObjectInput in) Workspace Report errors ... Name : Email: View Answer

58.	What modifiers are allowed for methods in an Interface?
	Answer: Only public and abstract modifiers are allowed for methods in interfaces. Workspace Report errors ... Name : Email: View Answer

59.	What is a local, member and a class variable?
	Answer: Variables declared within a method are "local" variables. Variables declared within the class i.e not within any methods are "member" variables (global variables). Variables declared within the class i.e not within any methods and are defined as "static" are class variables. Workspace Report errors ... Name : Email: View Answer

60.	What is an abstract method?
	Answer: An abstract method is a method whose implementation is deferred to a subclass. Workspace Report errors ... Name : Email: View Answer