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What are virtual functions
mercury
- Sep 7th, 2006
Virtual Functions are useful in implementing polymorphism which is runtime binding/dynamic binding;Whereas Overloading(Function Overloading & Operator Overloading) implement compile-time bind...
gmenon
- Nov 28th, 2005
All methods in Java are virtual i.e. always the most derived version of the method is called
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How do you invoke a Servelt. What is the difference in between doPost and doGet methods
jimmy514in
- May 18th, 2010
doGet():the parameters that are passed appear in teh address bar.There can be security violations since the parameters can be changed.The doGet() functionality is idempotent.The doGet() allows payload...
arshiya
- Nov 7th, 2007
DoGet1.allows only 2k data2.url in the form of name=value pairs (www.getHelp.com?name1=value1&name2=value2doPost1.no limit on data siza2.no name value pairs in the url
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Have you used threads in Servlet
Prasad MN
- Dec 28th, 2012
We can implements SingleThreadModel in Servlets Class.
CodeSandhya.Kishan
- Jul 26th, 2012
Servlets dont run in their own threads. Instead, when a request comes in, the app server removes a thread from a master thread pool and uses it to drive the servlets service method. Once the service method has returned, the thread is returned to the thread pool.
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What is meant by cookies. Explain
jimmy514in
- May 18th, 2010
Cookies cache useful information about the page / website being visited Cookies is a object in Java. HttpServlet returns a Cookies [] cookies= request.getCookies().
saravanan_msit
- Oct 26th, 2005
Cookies is linking one page to another page in web pages.
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What is the range of the char type
The range of the char type is 0 to 2^16 - 1.
sunny
- Apr 22nd, 2012
In java char define with 2 byte not 1 byte i. e. 0 to 65536
Sandhya.Kishan
- Apr 14th, 2012
The char data type ranges from 128 to 127 and it requires 1 byte to store a particular character.
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If a variable is declared as private, where may the variable be accessed
A private variable may only be accessed within the class in which it is declared.
Anonymous
- Jun 7th, 2012
I understand your question to be pertaining to private variables w/in a class and not local variables (i.e. variables declared w/in a method). That said, a private variable may be accessed by constru...
Sandhya.Kishan
- Jun 2nd, 2012
The private variables can be accessed only in the block in which they have been declared.
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What is the difference between a Choice and a List
A Choice is displayed in a compact form that requires you to pull it down to see the listof availablechoices. Only one item may be selected from a Choice. A List may be displayed in such away that severalList items are visible. A List supports the selection of one or more List items.
Anurag yadav
- Oct 9th, 2019
Choice and list awt
Sandhya.Kishan
- Jun 11th, 2012
Choice contains a list of items and we can only select one item from a choice.
List is used to display several items and we can select more than one item from a list. -
Can an unreachable object become reachable again
An unreachable object may become reachable again. This can happen when the object'sfinalize() method isinvoked and the object performs an operation which causes it to become accessible toreachable objects.
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How many methods in the Serializable interface?
There is no method in the Serializable interface. The Serializable interface acts as a marker, telling the object serialization tools that your class is serializable.
Prasad MN
- Dec 17th, 2012
There is no methods in serializable interface. It is a marker interface and null interface.
ram
- Nov 22nd, 2012
Does not have any methods in Serializable interface......
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What is the difference between static binding and dynamic binding?
kumpsath
- Sep 19th, 2009
1. Statis Binding : Initialize the variable like, private static HashMap map=new HashMap(); 2. Dynamic Binding: Initialize the variable like, private HashMap map; and somewhere in the method do map=new HashMap(); Please let me kknow if any change is there...!
SrinivasaRao.T
- Jun 16th, 2006
Static Binding: if the binding is occur at compile time of our source code is called static bindingDynamic Binding: if the binding is occur when interpreter our class fine, then that binding is called Dynamic Binding.
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What do u mean by precompiled statement? What is the difference between Statement and PreparedStatement?
Akib Jabed
- Oct 31st, 2022
Since the query is passed at the time of implementation object creation of the preparedStatement net interface but not in the execute() method.
Hence, preparedStatement are also known as precompiled Statements.Sandhya14
- Apr 4th, 2008
A PreparedStatement is precompiled statement.It means PreparedStatement compiles the SQL Statement in the first run itself. Thus, if the Statement is preparedStatement, you can run the Statement ...
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Whats the Difference between String and StringBuffer?
cirrus
- Feb 19th, 2012
The String class creates string objects that are not mutable. On the other hand, StringBuffer objects are mutable.
Pradeep Reddy
- Feb 18th, 2012
String class objects are immutable and hence their contents cant modified.String buffer class objects are mutable.methods that directly manipulate data also available in string buffer class.
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What is the difference between connection pool and data source
shaik subhani
- Feb 14th, 2008
Actually to use connection objects in the connection pool we need datasource object .if you take weblogic , if u want to contact to connection pool , u must get data source object. Thats all.
prasanna_b2001@yahoo.com
- Feb 7th, 2008
I dont think we can compare connection pool and data source.Both serves to access the database thru our application.If you create a connection pool in your web/app server then you can use them and acc...
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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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Which one of the following is NOT a configurable JVM option?
Choice 1: Collect profiling and debugging statistics. Choice 2: Modify the number of bits a double variable uses. Choice 3 : Set the initial memory allocation pool size. Choice 4 :Modify the garbage collector's behavior. Choice 5 :Set the maximum memory allocation pool size.
hiranmoy
- Dec 27th, 2011
Modify the number of bits a double variable uses.
Saravanan_Sivaji
- Mar 7th, 2009
We can collect profiling and debugging statistics. we can set the initial memory allocation pool size. we can set the maximum memory allocation pool size. we can modify the gar...
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Exeption Handling
What happenes if exception occur in finally block?
fcasttro
- Mar 23rd, 2007
Finally is just a method, if an exception occurs in finally block the program will terminate. So, U just put a try - catch block inside the finally block. Are explicit...
pramod.reddy
- Mar 16th, 2007
Finally is like any other block or method , but this will be executed untill and unless your JVM is shutdown if an exception occurs in finally blcok and if u dont catch it program will terminate.
Java Interview Questions
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