Java Questions

Q:

What is Shallow and deep cloning in Java?

Answer

Cloning refers to creating duplicate copies of objects in java.


Shallow Cloning: Shallow cloning is a bitwise copy of an object. New object is created which is an exact copy that of the original one. In case any objects are referring the fields of these objects, just the references are copied.


Deep Cloning: In deep cloning, complete duplicate copy of the original copy is created. Deep cloning creates not only the primitive values of the original objects but also copies all its sub objects as well.


Clonable interface is used to perform cloning in java.

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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:

What is the purpose of garbage collection in Java, and when is it used ?

Answer

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.

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Q:

Are arrays primitive data types?

Answer In Java, Arrays are objects.
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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:

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 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:

How is final different from finally and finalize()?

Answer final is a modifier which can be applied to a class or a method or a variable. final class can't be inherited, final method can't be overridden and final variable can't be changed.

finally is an exception handling code section which gets executed whether an exception is raised or not by the try block code segment.

finalize() is a method of Object class which will be executed by the JVM just before garbage collecting object to give a final chance for resource releasing activity.
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