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Explain Servlet and JSP life cycle
nalindascjp
- Mar 4th, 2010
A Servlet is a Java class which faclitates a web developer to write dynemic web pages. JSP is the presentation componant that used with Servlets to make a page dynamic. Generally a JSP is a HTML docum...
sripatnaiky
- Feb 4th, 2010
Life cycles are pretty same, as the JSP will be translated into a servlet during the translation phase, the important point to be considered here is if we include another JSP by making use o...
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How is serialization implemented in Java
Rajesh G
- Aug 3rd, 2007
Serialization is the mechanism of converting the state of an object to stream of bytes to a persistant storage area(file). By making an object serializable we are making the object as network enabled.Rajesh
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IBM Interview Questions in Bangalore
Br />1.what is oracle.2.what is major differenece oracle8i and oracle9i.4.tell me some thing ur self.5.please tell me about oops.6.what is single inheritance.7.what is multiple inheritance.8.can java support multiple inheritance.9.what is interface.10.what is differenec between abstract class and interface.11.how to u prove that abstrace class cannot instantiate directly.12.what is differenece between...
sujain
- Aug 17th, 2010
5. About OOPS: Object Oriented Programming is based on three major concepts: Inheritance, Polymorphism and Encapsulation Inheritance: Through inheritance the base class properties are acquired in subc...
anithananduri
- Aug 28th, 2009
8.can java support multiple inheritance.java support multiple inheritance for interfaces not fro classes25.what is difference between procedure and functions.function returns only one value where as procedure returns more than one value
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Explain the importance of "static"keyword
sampra
- Mar 6th, 2008
Static menthods, variables or block is executed in the order they are written in the class while class is getting loaded. Static methods are variables can be invoked without creating an object of the ...
vishalchat
- Feb 23rd, 2008
Static menthods, variables or block is executed in the order they are written in the class while class is getting loaded. Static methods are variables can be invoked without creating an object of the class. There is only one instance of the variable in the JVM.
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What will this printint i=10000System.out.println(i*i);and explain why ?
I do't know
vasu.funky
- Oct 7th, 2007
It will give you the multiplied value..does not throw an error..we are no way storing this result (i mean you are not storing thisvalue in any interger or so...) it is just displayed in the sop which expects a string value
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What is the difference between transient variable,volatile variable
sampra
- Mar 6th, 2012
transient variable is the variable which cant be serialized..volatile is useful in multi thread env.each thread has ots own copy to update..in fact it wont update the main memory var ..its update the ...
Sanjeev
- Jan 25th, 2012
If you are working with the multi-threaded programming, the volatile keyword will be more useful. When multiple threads using the same variable, each thread will have its own copy of the local cache f...
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What is difference between array & arraylist?
Arraylist is resizable where as using array it is not possible.
Sukhrob
- Dec 24th, 2015
First difference: array is already with fixed size while array lists size could be dynamically changed.
Secondly, array can include only the same type of data while array list can consist of different primitive data types as well as objects.rakesh
- Nov 18th, 2015
Array is collection of similar data type values. We cant resizable and growable of array. It is already fixed when you declared while array list works as a dynamic in which size could be grow. It is a part of collection framework to handle or store the collection of object not any type of values.
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What is garbage collection? can it be forced?
Karuna Reddy
- Jun 6th, 2008
Garbage Collection: If no longer any obejct need to any variable, java automatically reclaimes the memory.U can't force the GC, U have to give the request by using system.gc() and even not guarante that its immediatly to reclaims the memory...........
vinaymudgil007
- Jun 5th, 2008
garbage collection means releasing the memory free from the objects that can no longer be refferenced.No it can't be forced.............. although system.gc() or whatever may request for garbage collection but when exactly it would be started is at the discretion of JVM.
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Why Java is secured compare with other languages? Explain with example.
prachi patil
- Oct 24th, 2016
Java: The Most Secure Programming Language? What makes Java the most secure programming language? Or is it really so? We will discuss the same in this blog. If you wish to make a career in Java progr...
aleemkh
- Jul 29th, 2008
Before talking about secure , let us compare the difference between C and Java.First a C program is coverted as shown belowC(sourcecode) --> compiler---> compiles to binary (101010)---> OperatingSyste...
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What is the difference between Static and Dynamic Polymorphisim?
pradeep_gupta49
- Sep 16th, 2010
First of all I am telling about Polymorphism Polymorphism: The term polymorphism was defined from the greek 'Poly' and 'morphos' which mean 'many' and 'forms'. Poly+Morphos=Many forms Polymorph...
bhaumiklitu
- Jan 5th, 2009
The term static polymorphism is associated with overloaded methods because it gives the impression that a single named method will accept a number of different argument types. The System.out.println()...
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What type of access specifiers can we use for local variables?
Sarje
- Aug 18th, 2009
Local variable cannot be modified using any of the acceess specifiers means you can not write private or protected or public before them.Local variables are by default (implicitly)? private no need to make it explicitly private or protected or public otherwise it won't compile.
er.mukesh_208
- Aug 3rd, 2008
Local variables (including formal parameters) are visible only in the method, constructor, or block in which they are declared. Access modifiers (private, public, ...) can not be used with local var...
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Is SQLException run time or compile time exception?
timmireddy
- Jul 14th, 2008
SQLexception that is thrown when SQL Server returns a warning or error. This class cannot be inherited. SQLException comes under Runtime exception because errors comes under Unchecked Exceptions.
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What is the result of expression 5.45 + "3.2"?
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Null keyword
Is null a keyword? if not what is it?
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interviewprep9- Member Since Jun-2008 | Jun 14th, 2008
Capital N, Null is not a keyword or a reserved word.
All small letters, null is not a keyword either. but, it's a reserved word. you cannot use null as follows:
String null = "a";
null means that a reference is not pointing to any object.
Sarje
- Aug 17th, 2009
Null is not a keyword but null is reserved literal. null is the default value for instance variable.String str = null;means instance variable str does not hold reference of any object.
varmasuman
- Sep 13th, 2008
Null?means showing nothingWhenever one object reference refers null i.e? ServletConfig application=null;Then there is nothing in the object reference application.
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Usage of Abstract class and Interfaces
In Real time when we go for Abstract classes and when we go for Interfaces
Sarje
- Aug 13th, 2009
If you want to create only abstract methods in a class then use interface and if you want to create some of the methods as abstract and some as concrete then use abstract class.
dyy123
- Nov 14th, 2008
When you don't want to expose the implementation of the methods then you can use the Interface. Abstract class is will have some methods implemented and some unimplemented.
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Static data member
What is the use of static data member?
Sarje
- Aug 13th, 2009
Static data members field (variable) and method belong to class. Static fields can be used before creating an instance of the class and static method can be accessed using class name.
aditya_8584
- Mar 24th, 2009
Static data member has a class scope. A single copy of static data member get shared?within the objects of that class. A non-static member cannot access a static member of that class.
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Need of Polymorphism
What is need of polymorphism in Java? What could have happen if polymorphism is not present?
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syamala235- Member Since Mar-2010 | Apr 8th, 2010
Polymorphism in simple terms means one name many forms. Polymorphism enables one entity to be used as a general category for different types of actions. The specific action is determined by the exact nature of the situation.
Polymorphism exists in three distinct forms in Java:
• Method overloading
• Method overriding through inheritance
• Method overriding through the Java interfacePrashant kumar gupta
- Oct 28th, 2017
We have different behaviors in different situations and in front of different people. A man behaves differently with his father, when he is with his friend he has different behavior. Another best exa...
suraj
- Jun 19th, 2017
Polymorphism means one thing in many form. or one person different behavior is called polymorphism.
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What is the purpose of interface? And tell the difference between the class and interface?
sachin
- Aug 2nd, 2011
interface is mainly used to achieve standardization and loose coupling.. Its like a media between two systems. Interface can be treated like rules, where only method definition is present but not imp...
surya_merla
- Jun 7th, 2009
An interface is a specification of method prototypes. All the methods of interface are public and abstract. They are public because they should be available to third party vendors and they are abstrac...
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How to Synchronize the HashMap
Any Body Tell about this
pitu2000
- Aug 21st, 2010
After introduction of concurrency api in Java 1.5 we have one more way to synchronize a hashmap>> new java.util.concurrent.ConcurrentHashMap(hashmapObj);
EshaPrasad
- Apr 21st, 2009
We can do as given belowHashMap hm = new HashMap(); HashMap hm2 = (HashMap)Collections.synchronizedMap(hm); ArrayList a1 = new ArrayList(); ArrayList a2 = (ArrayList)Collections.synchronizedList(...
Core Java Interview Questions
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