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What are advantages and usage of static block?
pdommara
- May 28th, 2010
The above answers are missing important point that is it even runs before your class constructor.
vinaymudgil007
- Jun 10th, 2008
static block is executed whenever a class is loaded by the JVM.....hence in case you want certain code to executed or say some objects of a class avaliable to ur application as soon as the application starts you can put in the relevant code there....vinny
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What is the use of writing empty catch block?
vinaymudgil007
- Jul 31st, 2008
Just catch the exception & swallow it [don't take any action].that's all.vinay
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Will there be a performance penalty if you make a method synchronized? If so, can you make any design changes to improve the performance
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Editorial / Best Answer
Answered by: Faisal Ghauri
- Jul 24th, 2005
Performance does take a hit when using synchronization. I think the way to reduce this hit is to synchronize only a block of code that will be accessed by threads and not synchronize the entire method.
sumeesudha
- Feb 6th, 2010
There is degradation in performance when you make a method synchronized. Even when a program contains only a single thread running on a single processor, a synchronized method call is still slow...
sripatnaiky
- Feb 4th, 2010
The Synchronization may be useful in avoiding the deadlock, helpful in maintaining the consistent object state etc,. Only one thread will be accessed at a time by acquiring lock on the synchronized bl...
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Differences between HashList and HashMap, Set and List
nnandurkar
- Jun 23rd, 2010
Hashtable is syncronised where as HashMap is not. Hence, HashMap is faster.Hasttable does not allow any null value as either key or value. However, HashMap allows multiple null values and one nul...
kayalsuku
- Jun 2nd, 2008
HashMap is an unordered and unsorted map. Allow one null key and many null values. Lists are collections that maintain their elements in order, and can contain duplicates. Set interface do not a...
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What is data encapsulation? What does it buy you
ragini.rani
- Mar 13th, 2006
encapsulation mean data hiding.data correspond to varibles and methods of the class. Data hiding mean: when u make different objects of the same class. The data stored in one object is unaware of the data for other object of the same class. In, this way it gives secure data.
Devidas Sonawane
- Oct 28th, 2005
Encapsulation:- it is a mechanism to binds data and bytecodes and b'coz of that data is protected and becomes secure.
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Would you like to derive data from a base class
biman786
- Aug 14th, 2010
If the Base class and super class are within same package, then data of super class should be public or default or protected. But if base and super classes are in different packages, then?then data of super class should be public or protected.
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What is the Difference between Design Pattern and Architecture? Can any one answer for this plz..
Design Pattern means how u r approaching the problem.Architecture means how the data is flowing in your application
sambitsahu
- Jan 5th, 2010
Design Pattern:A design pattern suggests a solution for a recurring design problem in an application and the solution is generally open for future extensions.Architecture:It's an outline of an app...
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Why ArrayList is faster than Vector?
meSubhadip
- Jul 21st, 2009
Vector is synchronized so JVM needs to take extra care to acquire and release locks to make vector thread safe. But ArrayList is not synchronized so JVM doesn't need this extra overhead.That's why arraylist is faster than vector.
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What is the difference between Enumeration and Iterator?. When i can use Enumeration and when i can use iterator?. Can any one tell me the situation that only Enumeration could able to solve that problem and vice versa.
In Enumeration we cant modify the elements. where as in iterator we can modify the elements
guls.naikwadi
- Dec 27th, 2009
Both are used to traverse objects one by one but Enumeration is a legacy classes and it comes with Java1.1 Iterater they have introduced in Collection framework. Enumeration can be used for Coll...
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How can u tell HashTable is Synchronized?(IBM-chennai)
John
- Apr 3rd, 2007
HashTable is synchronized
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Please Give me an example for User defined Exception
nagarajcse82
- Nov 28th, 2005
in case of system defined exceptions,if any violation occured while executing the code,it will create a exception object and throw that object.in catch block u catch it and give appropriate message.us...
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What is the difference between java and c and c++?
satheesh kumar. sriramaneni
- May 10th, 2006
In Java, the JVM will allocate memory to the object.So, it's a platform independent. In C/C++ ,the OS will allocate memory to the object.So, it's a platform dependent.Java is a Robust language, Means ...
miggu
- Apr 7th, 2006
difference between java,C++ & Cjava doesn,t supports pointers but C++ supports java doesn,t supports structures and unions but C++ supports.C is a procedural based language but java and C++ are object-oriented language .C doesn,t supports classes and objects but java and C++ supports.
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How do you push an applet in to the servlet?
sbarik
- Apr 24th, 2006
Applet is a client side Application. wheras A servlet is a server side application.The servlet sends its resopnse as HTML (By default) to the client. U can just push the applet in servlet just by writ...
sbarik
- Apr 24th, 2006
U can push an Applet into a servlet by just writting the th tag in the servleteg:- out.println("<applet code=AccessoryFileChooser.class width=400 height=400>");
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Advantages of Implementing Runnable over extending Thread
msarada
- Aug 24th, 2006
the reason is, generally we extend a class if we want to enhance or modify the existing class.Thread class has several methods including run().Runnable interface has only one method i.e. run().in any ...
premmm
- Jul 29th, 2006
Thanks FYI raviThis is prem, could you send me mail about youpremkumar.cm@gmail.comtxsPremmm
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What is serialization?What is transient?What is the default value of a transient variable?
vinaymudgil007
- Jun 10th, 2008
serialization -- means saving the state of an object at a particalar instance of time.transient -- appended before a variable to ensure that the valiable is not saved during serailizationdefault value -- well, that has nothing to do with serailization, it depends on the data type of the variable
Ganesh Bala Kumar
- Aug 14th, 2006
Hi,State is nothing but the present values of the class level variables and behaviour (methods) of the class.Suppose if u r having setters and getters in ur class , when u retrieve the values into the...
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What is the difference throw and throws
sampra
- Feb 14th, 2008
throw when toy have to send exception or userdefine exception by your own.throws is use to throw method level exception
priyaranjan
- Oct 3rd, 2007
Thow is a excptionThrows is a error
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Can the main() method be overloaded? or overrided? and what happens when we do so?
Vibs
- May 17th, 2007
Yes, it can be both overloaded and overridden.When you over ride, its going to call the main of the class that you mention with java command.In case of overload, the overloaded method will no longer be treated as main method but it will be normal like other methods.
Core Java Interview Questions
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