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Serialization
Serialization ignores static variable and transient variables. Why?
meravi84
- May 22nd, 2009
Serialization is a techniques which maintain the state of the object and static variables are class variable, they do not define the state of an object. so serialization ignore this.Transient variable...
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To what value is a variable of the String type automatically initialized
The default value of an String type is null.
jigyasa_sienna
- Jun 7th, 2009
Just to reuse the code in a new way. It helps by not making the
correction in the superclass instead of that just simply changing the body of
method without changing the signatures of that method.
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Compiler Unit and Executable Unit
What is Compiler Unit and Executable Unit?
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What is Collection and how it supports java?
kritika jha
- Jun 13th, 2009
Collections are objects that hold other objects that are accessed, placed, and maintained under some set of rules.
hariprasad
- Oct 30th, 2006
collection is a group of objects.its an basic interface to all interfaces.under collection set and list are sub interfaces.These 2 interfaces extends collection interface.By using collections we can r...
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What is the difference between Socket and ServerSocket class in java.net package
kritika jha
- Jun 13th, 2009
Socket class is meant for client side, so in a client side you need to make a object of Socket class for any networking application, whereasFor server side networking application ServerSocket clas...
dinesh_greekinterview
- Feb 20th, 2007
difference b/w ServerSocket and Socket :ServerSocket : &n...
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Run Time Exceptions
What do exception mean in java ? what type of run time exceptions?
sanjusr25
- Jun 13th, 2009
Exception means an unwanted condition occur during the excecution of a program.Exception are of two type 1) Checked Exception2) Unchecked Exception Checked exception are those exception which can be...
ranaraj
- Dec 3rd, 2008
List of error exceptions are1).arithmetic Exception2).arrayindexoutofbounds?Exception3).arraystore?Exception4).filenotfoundException 5).ioException6).nullpointerException7).numberformatException8).outofmemoryException9).securityException10).stackoverflowException11).stringindexoutofboundsException
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Reference Variable Size
What is the size of reference variable?
Sagar Mitkari
- Jun 15th, 2009
Not 8 bits. We never know what is the value of reference variables. But one thing for sure all the reference variables you refer have same value as far as memory allocation issue is concerned....
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Does garbage collection guarantee that a program will not run out of memory
Garbage collection does not guarantee that a program will not run out of memory. It ispossible for programs to use up memory resources faster than they are garbage collected.It is also possible for programs to create objects that are not subject to garbage collection
TestMeUser
- Jun 18th, 2009
Static objects will never be garbage collected. So try using them if you are desperate to write code that way.
dgiscool
- Oct 9th, 2005
The object is eligible for garbage collection only if there is no strong reference to the object. An exception to this is island of references(where all objects point to each other).And you should ne...
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As of now ,what i know abt cloning is that we can make a field to field copy of an object.ie when we clone an object,its state as well as a its behaviour is copied to the cloned object.My question is what is the neccesity of it? cant we create another object of the same class? so how does its different from cloned object (that is creating another object of that class rather than being cloned).is there any security issues coupled with this cloned object? And What is the Concrete purpose of Cloning?
kjwilde
- Jun 23rd, 2009
Creating a new instance of the same class and then being sure to apply all attributes of the original object to the new object would be equivalent to cloning. The clone method takes the legwork out of getting a duplicate of an object.
KV
- Jun 25th, 2005
Cloning is necessary. Suppose one of the instance fields of your class is mutable object... so if you are wrting a accessor (getter) for such a field.. u can not return the field object itself......
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Difference between AWT and Swing compenents
satyamaddukuris
- Jun 24th, 2009
AWT components are heavy weight. Swing components are light weight follows MVC architecture
Radhey Krishna Yadav
- Apr 18th, 2006
awt is not platform independent whereas swing is plateform independent because the resolution of awt is defferent 16-bit computer and 32-bit computer whereas in case of swing resolution is same on dif...
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The finalize() method will always be invoked once before the object is garbagecollected. However, the finalize() method might never be invoked for an object in itslifetime, because there is no guarantee that it will get garbage collected.Then what is the use of the finalize() method? Why should we use it?
chkalyane
- Jul 6th, 2009
Finalize method is used to clean up the unmanaged code. when we use the finalize method that object reference will be placed into the finalize queue. so whenever the memory required the GC will lookinto the finalize queue and corresponding object will be freed.
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Multiple Inheritance
Why multiple inheritance is not applied in Java?
vinodkashyap
- Jul 9th, 2009
Lets take an exampleClass A{ public void clear(){ }}Class A{ public void clear(){ }}Class B extends A{ public void clear(){ }}Class C extends A{ public void clear(){ }}Now If multiple inhertence is al...
rhingarajiya
- Jul 8th, 2009
In Multiple Inheritance, Diamond problem may arise. So Java supports multiple interface inheritance instaed of multiple inheritance.
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Collection SynchronisedList
What is SynchronisedList in Collection?
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Event Adapters
What are event adapters & How they are used?
anithananduri
- Jul 22nd, 2009
Adapter classes help us in avoiding the implementation of the empty method bodies. Generally an adapter class is there for each listener interface having more than one method.these adapter classes have overridden methods for all events.
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Inheritance
What are the different types of inheritance available in Java?
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Java Virtual Functions
How to achieve Virtual Functions in Java?
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Volatile Variable
Why a shared variable in Java can be marked as volatile? Give Reason
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Interface
How do we use interface to overcome multi-level inheritance?
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Stacktrace
What is "stacktrace" in Java? How can we use this?
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Memory Allocation Methods
What are some Methods for allocating memory for an array?
Java Interview Questions
Ans