Java Questions

Q:

If super class ref is pointing sub class object then by using super class ref is it possible to call sub class newly defined method?

Answer

yes if the method is ovreriding method


no if the method is not overriding method

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Q:

What is classloader?

Answer

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.

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Q:

Difference between Swing and Awt ?

Answer

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

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Q:

Why interface data is final?

Answer

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

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Q:

What is encapsulation?

Answer

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

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Q:

What is diamond problem?

Answer

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

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Q:

What is DriverManager ?

Answer

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

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Q:

What is the SimpleTimeZone class?

Answer

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.

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