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Which of the function returns a reference to an object provided by an ActiveX component. a) createobject b) getobjectname c) createobjectx d) getobject
subhash gherade
- Jan 23rd, 2010
D ) getobjectReturns a reference to an object provided by an ActiveX component.SyntaxGetObject([pathname ] [ , class ] )
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Struts Advantage
What is the advantage of using struts?
yogesh249
- Jan 27th, 2010
The main advantage of using Struts is that MVC architecture is followed.All the layers, presenation, business and Data access layers are seperated and Web-designer can work independently of the programmer and programmer need not have the knowledge of the designing part.
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Can HashMap store null values?If yes, how many?
Can HashMap store null values?If yes, how many?What is singleton class? Give one example.Please describe the difference between 'int' and 'Integer',what is the purpose of 'Integer', where should we use 'Integer' vs 'int'?
sushilbehera
- Jan 29th, 2010
Yes HashMap can store null values. Any number of null values can be stored.Please note null can be stored multiple times as value however only one time as key.
fcasttro
- Mar 22nd, 2008
Map Won't allow duplicates, So It will accept one null value.HashMap map = new HashMap();map.put(null, null);map.put(null, null); map.put(null, null);After adding 3 null key / value pairs. It will...
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What are the various ways of creating a thread. What is difference between them
theJavaGuy
- Jan 30th, 2010
Two ways-1. By extending Thread class2. By implementing Runnable interfaceWe extend the thread class when we are creating a new thread to assign a specific type of job to that thread. But if we want t...
gyanesh
- Jul 20th, 2005
The thread can be created either by extending the Thread class or implement the Runnable interface.
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Java LinkedList Implementation
If Java does not have pointers then how LinkedList is implemented in Java?
jagadeesh.tel
- Feb 7th, 2010
In Java everything is handled in objects. It is neither primitive data nor a pointer like in C.With the object reference you can handle everything in the object data. Now coming to the linked lis...
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Can a for statement loop indefinitely
Yes, a for statement can loop indefinitely. For example, consider the following:for(;;) ;
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How can you avoid the runtime exception
gnanasekar45
- Feb 18th, 2010
We cannot avoid a runtime exception it will be handled by the JVM's default exception handler and print's the particular stacktrace.
Kulwant
- Sep 12th, 2005
Using thows we can catch run time exception
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What is the difference between RequestDispatcher.forward(request req,response res) And response.sencRedirect("url");?
npsarathy
- Mar 7th, 2010
Forward sends the same request object that is available in that page The client will not see any change in URL in the browser When SendRedirect is used the request scope objects are no longer avai...
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How to validate a textbox through javascript
richi.sankalp1990
- Apr 15th, 2010
A textbox can be validated using a JavaScript, by using a redirection to the JavaScript page ..say I need to check for username, then, we redirect the form to login.js (JavaScript for the ch...
jitendra224
- Apr 12th, 2010
Write with inscript<script type="text/javascript">function validateFormOnSubmit(theForm) { var reason = "";&n...
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Int and integer
What is the difference between int and integer?
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What is exactly difference between throw and throws in java?
imwim
- May 1st, 2010
To manually throw a exception we used throw (user defined exception) and throws are default exception which we used when we use bufferreader.
ajaink2008
- Nov 21st, 2007
Throw is used to pass an exception up to the method that called itThrows is used to indicate that method pass exception to the method that the method called
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Override Final Method
How to override final method?
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What is the purpose of using String a[] in Java
kiran378
- May 5th, 2010
To Provide Command Line Arguments.for example let us take Bubble Sort, it can sort either ascending or descending.now we can invoke class BubbleSort as java BubbleSort -asc ...
John
- Jun 13th, 2007
String a[] gives you an array of strings.String a[] = new String[10] gives you an array of 10 strings with the index starting at 0 and going through 9.
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What is static class
jimmy514in
- May 17th, 2010
Static class creates just one copy in JVM.Static class can be used like a singleton class.Static class is used when you need just one copy in the system.Esp. when there are security applications associated with it.
ilovejava
- Jul 31st, 2005
By using static inner classes, you can add additional support functionality to your systems for capabilities such as testing, while incurring no penalties in normal, production deployment
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What is the difference between yielding and sleeping
When a task invokes its yield() method, it returns to the ready state. When a task invokesits sleep()method, it returns to the waiting state.
jimmy514in
- May 18th, 2010
On yielding it returns to Running state.On sleeping, it returns to wait state.
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What is the Collections API
The Collections API is a set of classes and interfaces that support operations oncollections of objects.
jimmy514in
- May 18th, 2010
Collection API provides a rich set of interfaces and collection framework clases like:ArrayListVectorHashSetHashMapHashTableTreeSetand a list of interfaces:List, Set, Trees.
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What is the purpose of the System class
The purpose of the System class is to provide access to system resources.
jimmy514in
- May 18th, 2010
System class can be used to get the properties of the JVMcan be used to get the runtime instance.can be used to call the garbage collection
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Which class should you use to obtain design information about an object
The Class class is used to obtain information about an object's design.
jimmy514in
- May 18th, 2010
Reflection can be used to get the information about the class methods and properties.
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What synchronization constructs does Java provide? How do they work?
jimmy514in
- May 18th, 2010
Synchronization can be used by:using synchronized function() to lock the objectusing static synchronized function() to lock the class objectusing wait(), notify() and notifyall() for two objects to co...
Vasudha
- Mar 23rd, 2005
You may synchronize a class, a method or a portion of a method. Synchronization will make the code thread safe.
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Which characters may be used as the second character of an identifier, but notas the firstcharacter of an identifier
The digits 0 through 9 may not be used as the first character of an identifier but they maybe used after thefirst character of an identifier.
jimmy514in
- May 18th, 2010
$ _ can be used as first charactersAny numbers from 0-9 can be used as second letter but not as the first letter.
Java Interview Questions
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