Java Questions

bcoz interface does not contains any initializers and constructors to initialize its data members.

AWT are heavy-weight componenets. Swings are light-weight components. Hence swing works faster than AWT.

The classloader is a subsystem of JVM that is used to load classes and interfaces.There are many types of classloaders e.g. Bootstrap classloader, Extension classloader, System classloader, Plugin classloader etc.

The diamond problem is an ambiguity that can occur when a class multiply inherits from two classes that both descend from a common super class

Encapsulation describes the ability of an object to hide its data and methods from the rest of the world 

yes if the method is ovreriding method

no if the method is not overriding method

The purpose of garbage collection is to identify and discard objects that are no longer needed by a program so that their resources can be reclaimed and reused. A Java object is subject to garbage collection when it becomes unreachable to the program in which it is used.

DriverManager is a class in java.sql package. It is the basic service for managing a set of JDBC drivers.