What is the difference between
Array and vector?
Array is a set of related
data type and static whereas vector is a growable array of objects and dynamic.
Blog Author: Vijay Kumar
Thursday 21 March 2013
What is the difference between exception and error?
What is the difference between
exception and error?
The exception class defines
mild error conditions that your program encounters. Exceptions can occur when
trying to open the file, which does not exist, the network connection is
disrupted, operands being manipulated are out of prescribed ranges, the class
file you are interested in loading is missing. The error class defines serious
error conditions that you should not attempt to recover from. In most cases it
is advisable to let the program terminate when such an error is encountered.
Blog Author: Vijay Kumar
What is multithreading and what are the methods for inter-thread communication and what is the class in which these methods are defined?
What is multithreading and what
are the methods for inter-thread communication and what is the class in which
these methods are defined?
Multithreading is the mechanism in which more
than one thread run independent of each other within the process. wait (),
notify () and notifyAll() methods can be used for inter-thread communication
and these methods are in Object class. wait() : When a thread executes a call
to wait() method, it surrenders the object lock and enters into a waiting
state. notify() or notifyAll() : To remove a thread from the waiting state,
some other thread must make a call to notify() or notifyAll() method on the
same object.
Blog Author: Vijay Kumar
What is the class and interface in java to create thread and which is the most advantageous method?
What is the class and interface
in java to create thread and which is the most advantageous method?
Thread class and Runnable interface can be
used to create threads and using Runnable interface is the most advantageous
method to create threads because we need not extend thread class here.
Blog Author: Vijay Kumar
What are the states associated in the thread?
What are the states associated
in the thread?
Thread contains ready,
running, waiting and dead states.
Blog Author: Vijay Kumar
When you will synchronize a piece of your code?
When you will synchronize a
piece of your code?
When you expect your code
will be accessed by different threads and these threads may change a particular
data causing data corruption.
Blog Author: Vijay Kumar
What is deadlock?
What is deadlock?
When two threads are waiting each other and
can’t precede the program is said to be deadlock.
Blog Author: Vijay Kumar
What is daemon thread and which method is used to create the daemon thread?
What is daemon thread and which
method is used to create the daemon thread?
Daemon thread is a low priority thread which
runs intermittently in the back ground doing the garbage collection operation
for the java runtime system. setDaemon method is used to create a daemon
thread.
Blog Author: Vijay Kumar
Are there any global variables in Java, which can be accessed by other part of your program?
Are there any global variables
in Java, which can be accessed by other part of your program?
No, it is not the main method in which you
define variables. Global variables is not possible because concept of
encapsulation is eliminated here.
Blog Author: Vijay Kumar
What is an applet?
What is an applet?
Applet is a dynamic and interactive program
that runs inside a web page displayed by a java capable browser.
Blog Author: Vijay Kumar
What is the difference between applications and applets?
What is the difference between
applications and applets?
a)Application must be run on local machine
whereas applet needs no explicit installation on local machine. b)Application
must be run explicitly within a java-compatible virtual machine whereas applet
loads and runs itself automatically in a java-enabled browser. d)Application
starts execution with its main method whereas applet starts execution with its
init method. e)Application can run with or without graphical user interface
whereas applet must run within a graphical user interface.
Blog Author: Vijay Kumar
How does applet recognize the height and width?
How does applet recognize the
height and width?
Using getParameters()
method.
Blog Author: Vijay Kumar
When do you use codebase in applet?
When do you use codebase in
applet?
When the applet class file
is not in the same directory, codebase is used.
Blog Author: Vijay Kumar
What is the lifecycle of an applet?
What is the lifecycle of an
applet?
init() method Can be called
when an applet is first loaded start() method Can be called each time an applet
is started. paint() method Can be called when the applet is minimized or
maximized. stop() method Can be used when the browser moves off the applet’s
page. destroy() method Can be called when the browser is finished with the
applet.
Blog Author: Vijay Kumar
How do you set security in applets?
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