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What is a transient variable
A transient variable is a variable that may not be serialized.
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sivagopal- Member Since Jun-2009 | Jun 8th, 2009
A variable that won't be allowed for object serialisation. so that the state of the value will always be defaulted after the deserialisation.
For example a variable x's value is set to 9, it's default value is '0' say, when the object has been serialized having x's value 9, after deserialisation will be defaulted to '0'
Use: In Java, serialization of an object allowed only when all the underlying objects of the object that is currently under serialization contains has a relationship, will not be allowed, some times the developer has no choice of implementing serializable marker interface on some classes as the classes might have been arrived from a third party and the developer has no control over them, but the developer needs to serialize the object's state, then the developer has the choice of marking the objects that not serializable as transient.
Yogesh Bombe
- Aug 11th, 2015
A transient variable is a variable that cannot be serialized. The transient keyword can be used to indicate the Java Virtual Machine that the variable is not part of the persistent state of the object.
raisha
- May 6th, 2013
transient is a keyword....If a variable is declared as a Transient ,we cant serialize that variable.. The important points about Transient are: 1) Transient keyword can only be applied to fields or ...
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An interface contains _________ methods
Skill/Topic: InheritanceA) AbstractB) Non-abstract C) Implemented D) Un-implemented
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Predict the output of the given code:
javapublic class Test {
private static String msg = "HCL ";
static{
Thread t = new Thread(new Runnable(){
public void run(){
msg = "Technologies ";
}
});
t.start();
}
public static void main(String[] args){
System.out.print(msg);
}}
a) Compiles and prints HCL
b) Compiles and prints Technologies
c) Compiles and... -
What is the difference between Abstract class and Interface
Answered by Scott on 2005-05-12 10:03:06: An abstract class can contain non-abstract methods which do not have to be overridden in the subclass. There is no difference between a fully abstract class (all methods declared as abstract and all fields are public static final) and an interface.
harihb
- Jun 2nd, 2011
Versioning and default functionality.Let's say that you have an abstract class called Human with a functionality walk(). Person A, B that extends abstract class gets the default functionality '...
purva15
- Sep 24th, 2009
A abstract class define both abstract and non abstract methods but interface can have only abstract methods.
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Which of the following is not a wrapper class?
A) StringB) IntegerC) BooleanD) Character
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Is null a keyword
The null value is not a keyword.
Himanshu chauhan
- May 26th, 2018
False
jimmy514in
- Jul 4th, 2010
Null is not a keyword in Java.It is a literal and cannot be used anywhereReference: http://java.sun.com/docs/books/tutorial/java/nutsandbolts/_keywords.html
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What is the difference between string and string buffer?
Tarun Wadhwa
- Sep 8th, 2008
Strings are immutable objects means you cannot modify the instance. For example when you create one instance of string and you are changing the value of string, it does not mean that you are changing ...
srinivaspulla
- Sep 7th, 2008
Java provides the StringBuffer and String classes, and the String class is used to manipulate character strings that cannot be changed. Simply stated, objects of type String are ...
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What is the difference between an if statement and a switch statement
The if statement is used to select among two alternatives. It uses a boolean expression todecide which alternative should be executed. The switch statement is used to select among multiple alternatives. It uses an int expression to determine which alternativeshould be executed.
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When to use Interface over abstract class?
Abstract Classes: Classes which cannot be instantiated. This means one cannot make a object of this class or in other way cannot create object by saying ClassAbs abs = new ClassAbs(); where ClassAbs is abstract class.Abstarct classes contains have one or more abstarct methods, ie method body only no implementation.Interfaces: These are same as abstract classes only difference is we an only define...
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Can a main() method of class be invoked in another class
LAXMINARSAIAH RAGIRI
- Dec 27th, 2011
Yes, it is possible for these you should declare it as public.
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Mention 5 basic difference between Array List and Vector in Java Colletion FrameWork.
Vector is unsynchronized wheras ArrayList is synchronized.
nextcome
- Jul 31st, 2010
ArrayList vs Vector1. Not thread-safe - Thread-safe2. Default size 0 - Default size is 103. Faster - Slower4. Belongs to legacy classes - Belongs to Collection framework5. User Iterator (fail-safe) - Enumator (no guarantee)Thanks
jyoti.bhandari
- Jun 11th, 2009
1. default arraylist size is 0 at initialization and vector is 102. vector is synchronized arraylist not3. vector increase its size double and arraylist half its initial size4. vector comes with legency classes but arraylist not5. vector cms with jdk 1.4 arraylist not
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Java is Architectural _____________
A) DependentB) NeutralC) IndependentD) None of the above
sudheer
- Jun 15th, 2012
Architectural neutral
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_____________ is the process by which one object acquires the properties of another object
A) EncapsulationB) ClassC) InheritenceD) Polymorphism
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What are the main differences between Java and C++?
Everything is an object in Java (Single root hierarchy as everything gets derived from java.lang.Object). Java does not have all the complicated aspects of C++ ( For ex: Pointers, templates, unions, operator overloading, structures etc..) The Java language promoters initially said "No pointers!", but when many programmers questioned how you can work without pointers, the promoters began saying "Restricted...
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Which of the following declare an array of string objects? (Select Multiple)
A) String[ ] s;B) String [ ]s:C) String[ s]:D) String s[ ]:
Java Interview Questions
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