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Run Servlets
How to run Servlets in Tomcat 5.3?
niehongchao
- Mar 6th, 2009
Configure the web.xml file and deploy the Servlet into WebApps dir of TOMCAT.
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How will u insert and delete with a single java connection when u have referential integrity?
raghu.emails
- Mar 6th, 2009
You can do both operations with a single Java connection but you need two?seperate statements to execute queries or use stored procedures to execute both queries.
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What is serialization? Any methods in serialization? What is externalization?
nithui
- Mar 14th, 2009
Serialization is the process of converting an object into a sequence of bits so that it can be stored on a storage medium (such as a file, or a memory buffer) or transmitted across a network conne...
uga durga prasad
- Aug 14th, 2007
Serialization is the process of? storing the state of an object into IO Stream, it is a Marker interface and it will not have any methods in it.
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What is the difference between Vector, Array and Arraylist
snehakesri
- Mar 20th, 2009
One more point :Vector defaults to doubling the size of its array, while the ArrayList increases its array size by 50 percent.
Sundeep sharma
- Oct 10th, 2006
In Java, arrays are objects. Arrays can be of primitive data types or reference types.
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Memory Allocation
How can you ensure that the memory allocated by an object is freed?
haribcse
- Mar 23rd, 2009
Garbage collection in Java cannot be forced. JVM will decide when to free memory
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Deamon Threads
What is deamon thread?
malayarasanm
- Mar 24th, 2009
Deamon thread is system level thread. You can create this thread. It will manage the user level threads.
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Choose between abs class with abs method and interface with abs method
If i have a class that can extend abs class n implement interface...and it doesn't have to achieve inheritance ,doesn't have to extend any other class then which 1 should i use between extending a abs class with abs method or implementing interface with abs method.?/pls ans
kandulas
- Mar 27th, 2009
interface cde { void abc();}class abc implements cde { public void abc() {System.out.println("hai"); }}class greek&n...
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Pass values from HTML page to the Servlet
How to pass values from HTML page to the Servlet?
anithananduri
- Apr 8th, 2009
we can pass html data to servlet using getParameter() method for example in doPost(......public void doPost(HttpServletRequest request, HttpServletResponse response) throw...
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Send Request in Servlets
Is it possible to send request by overriding doGet()and doPost()Methord in servlets? If Yes, How?
anithananduri
- Apr 9th, 2009
We can send request to servlet using doGet(), doPost().doGet() is used when we request servlet directly from browser.
anithananduri
- Mar 29th, 2009
To send request (to update/add) to any database doPost() is used, to retrieve data we use doGet() in Httpservlet
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Stopping Threads
How one thread can be stopped without coming out from the main programme?
anithananduri
- Apr 8th, 2009
We can suspend thread execution for a particular period of time by using sleep() method If we want to stop 1 thread execution until another thread execution is completed join() method is used By ...
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Class Path
Why should we set class path and path environment variables while installing J2SE and why not while Turbo C?
richakharya
- Apr 10th, 2009
Set the PATH variable if you want to be able to conveniently run the JDK executables (javac.exe, java.exe, javadoc.exe, etc.) from any directory without having to type the full path of the command. If...
mnazhar
- Apr 9th, 2009
Because TurboC generates .exe files which include all the libraries and runtime references. While in Java generates .class files which requires JRE/JDK libraries at runtime which are searched in CLASS...
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Which one of the following is a limitation of sub classing the Thread class?
Choice 1 It cannot have any static methods in the class. Choice 2 It must declare the class final. Choice 3 It cannot subclass any other class. Choice 4 It must implement the Threadable interface. Choice 5 It must catch the ThreadDeath exception
anithananduri
- Apr 10th, 2009
Choice 3 It cannot subclass any other class. because java supports multiple inheritance with interfaces not with classesChoice 4 It must implement the Threadable interface. another way of creati...
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Why applets can run without main() method?
B'coz they can run with the help of different browsers...
anithananduri
- Apr 10th, 2009
Applet program is executed by the browser not using the Java command, so main method is useless.
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Abstract class A{void display(){}}class B extends A{void display(){}psvm(String args[]){how can i instantiate the overridden method in class A}}
r.praveenkumar
- Apr 11th, 2009
All three answers above are correct. in 3rd one we are assigning object of B to reference of B itself. But in first and second answers we are assigning object of B to Reference of A. In all three cases JVM will invoke B's display() only.
anithananduri
- Apr 9th, 2009
abstract class A { void display() { } }class B extends A { void display() { &n...
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Thread Disadvantages
What are the disadvantages of using thread?
r.praveenkumar
- Apr 12th, 2009
while using threads, each thread has access to object's instance variable. so while one thread is making changes to that instance variable, another thread may access it. It results in inconsistenc...
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AWT Package
What are the Limitations of AWT package?
VenkitaKrishnan
- Apr 20th, 2009
a) Swings has much richer controls than AWT b) They are 100% java and do not depend on the Peer Classes. Hence light weight c) You can use the Look and Feel using swing d) Icons ...
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Subclass Frame
Why we prefer a subclass of Frame over an instance of Frame when we creating a window?
VenkitaKrishnan
- Apr 20th, 2009
One important reason would be to override the existing paint method which will work only if we subclass Frame and not create an instance of the frame.However since extends is such a premium in java, we should not waste it by simply subclassing Frame but use it for much more important purpose.
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Is a class a subclass of itself
A class is a subclass of itself.
AGRAWALNIDHI
- May 2nd, 2009
No, a class can't be a subclass of itself. class A extends AThis is cyclic inheritance which is not possible.
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Java Super Class
Which is the most super class of all the Java classes?
rhingarajiya
- May 2nd, 2009
The Object Class (java.lang.object) is the super class in the Java.If you write or use any Java class, that can inherit the instance method of Object class.
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System.out.println()
Why do we use 'out' in System.out.println();?
r.praveenkumar
- May 8th, 2009
Out is the object of printstream class... System.write() will write in byte stream fashion.. but System.out.println() will write in character stream format..
myogeshchavan97
- May 8th, 2009
Out is a object of System class.It is used to display output on the console.
Java Interview Questions
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