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 

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.

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

    }

   .....

}

SimpleTimeZone is a concrete subclass of TimeZone class. The TimeZone class represents a time zone, that is to be used with Gregorian calendar.

The SimpleTimeZone is created by using the base time zone offset from GMT time zone ID and rules, for starting and ending the time of daylight.