Java Questions

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.

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

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

Static member class is a class defined inside outer class with static modifier.

EX:

Class A {  //top level class or outer class

    .....

    static class B {  //static member class

    }

   .....

}

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

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

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