All tasks must implement the run() method, whether they are a subclass of Thread orimplement theRunnable interface.

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Jul 31st, 2012

The run() method must be implemented by all the threads.

Answer Question  Select Best Answer

The paint() method supports painting via a Graphics object. The repaint() method is usedto cause paint() tobe invoked by the AWT painting thread.

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Jul 31st, 2012

Whenever the window needs to be refreshed the paint() method is called automatically.The user does not specify the paint(). The user specifies the repaint() in order to obtain a rendering.repaint() i...

Answer Question  Select Best Answer

During compilation, the values of each case of a switch statement must evaluate to avalue that can bepromoted to an int value.

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Jul 31st, 2012

1.The compiler does not initialize auto and register variables at the beginning of a switch body where as we can put data definitions at the beginning of the switch body.
2.We cannot use a switch statement to jump over initializations.

Answer Question  Select Best Answer

What are the different ways to read input from keyboard at run time?

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Aug 1st, 2012

By using scanner class we can input data from the keyboard.By declaring the Scanner classs input as System.in, it pulls data from the keyboard (default system input).

Answer Question  Select Best Answer

Can a private/protected class be inherited? Explain

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Aug 1st, 2012

Yes, but they are not accessible. Although they are not visible or accessible via the class interface, they are inherited.

Answer Question  Select Best Answer

What are the byte values of datatypes?

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Aug 1st, 2012

The default byte value of data types in zero.

Answer Question  Select Best Answer

What algorithm is used in garbage collection?

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Aug 1st, 2012

The algorithms used by garbage collectors are
1.Na?ve mark-and-sweep
2.Tri-color marking

Answer Question  Select Best Answer

How to change jar file icon.

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Aug 1st, 2012

The jar file doesnt have an icon, its a system-wide setting that applies to ALL jar files.

Answer Question  Select Best Answer

How to avoid deadlock in Java?

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Aug 1st, 2012

A deadlock occurs when one thread has the control for A and tries to get the control for B while another thread has the control for B and tries to get the control for A. Each will wait forever for the...

Answer Question  Select Best Answer

How to convert bytecode to sourcecode?

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Aug 1st, 2012

A Java Decompiler (JD) can convert back the Bytecode (the .class file) into the source code (the .java file).

Answer Question  Select Best Answer

How to compress a String (algorithem)?

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Aug 1st, 2012

"java import java.io.ByteArrayOutputStream; java.io.IOException; import java.util.zip.GZIPOutputStream; import java.util.zip.*; public class zipUtil{ public static String compress...

Answer Question  Select Best Answer

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.

prabakaran29

 Profile Answers by prabakaran29 Questions by prabakaran29

• Aug 19th, 2012

Yes it is possible.using finalize in garbage collection

Sandhya.Kishan

 Profile Answers by Sandhya.Kishan Questions by Sandhya.Kishan

• Jul 31st, 2012

No, an unreachable object cannot be reached again.

Answer Question  Select Best Answer

Elangovanjavanandhan

• Aug 31st, 2012

Java is a platform independent and pure object oriented programming language. the java programs mainly developed for embedded system application.

Sharmila

• Mar 28th, 2007

JasperReports is a powerful open source Java reporting tool that has the ability to deliver rich content onto the screen, to the printer or into PDF, HTML, XLS, CSV and XML files.Check this link out http://java-source.net/open-source/charting-and-reporting/jasperreports

Answer Question  Select Best Answer

Vinay

• Sep 4th, 2012

Adding couple of other differences between Set and Map:
1. You can have an iterator for a set but not a map.
2. Processing a complete map takes longer whereas processing a complete set takes a comparatively less time (reason - iterator)

Pattukkottai Arun

• Jul 21st, 2005

A Set is a collection that has no duplicate elements.  A List is a collection that has an order assoicated with its elements.  A map is a way of storing key/value pairs. The way of storing a Map is similar to two-column table.

Answer Question  Select Best Answer

Under preemptive scheduling, the highest priority task executes until it enters the waitingor dead states or a higher priority task comes into existence. Under time slicing, a taskexecutes for a predefined slice of time and then reenters the pool of ready tasks. Thescheduler then determines which task should execute next, based on priority andother factors.

Madhuri Hasure

• Sep 27th, 2012

Preemptive scheduling enables the highest priority task execution until waiting or dead states entered. It also executes, until a higher priority task enters. Time slicing allows a task to execute fo...

Tejas Chavan

• Oct 18th, 2011

preemptive Scheduling:- the highest priority thread executes First that means when one thread is in running state that time the highest priority interrupt enters then this interrupt will executes firs...

Answer Question  Select Best Answer

The Locale class is used to tailor program output to the conventions of a particulargeographic, political, orcultural region.

pon suresh

• Oct 6th, 2012

What is object class in java?

prabakaran29

 Profile Answers by prabakaran29 Questions by prabakaran29

• Aug 19th, 2012

The locale class to used to tailor program output to the conventions of a particular geographic, political, or cultural region

Answer Question  Select Best Answer

karthika

• Oct 18th, 2012

Wrapper classes are the base class for the primitive datatypes.To be accessed as objects;
wrapper classes are used to be able to use primitive datatypes as objects...............

varun sharma

• Dec 6th, 2006

another informative thing is;there are 8 wrapper classes in J2EE

Answer Question  Select Best Answer

lokanath reddy

• Oct 25th, 2012

Class.forName("full qualm name"); is used to load the driver explicitly and DriverManger.registerDriver(new classname()); will implicitly loads the driver automatically

ruchi

• Jan 9th, 2006

Class.forName() is a method ,this method takes a string representing a fully qualified class name(one that includes the package name) and loads the corresponding class.

Answer Question  Select Best Answer

krish

• Oct 31st, 2012

Packages is nothing but Classes and Interfaces and sub-packages.
Sub-packages is nothing but Classes and Interfaces and sub-sub-packages.

Prashant Wayal

• Oct 19th, 2012

A package is a container which consists of classes and interfaces.

Answer Question  Select Best Answer

Hari

• Nov 2nd, 2012

Only 4 ways.
1) Class c=new Class(); -->Using new operator
2) Class.forName("Class"); -->Using class.forName
3) NumberFormat object=NumberFormat.getNumberInstance(); -->Using Factory methods
4) Class c=new Class();
Class c2=(Class)c.clone(); -->using Cloning

praveen

• Aug 8th, 2012

1.newInstance()
2.static factory()
3.InstanceFactory()
4.factoryPattern()
5.deserialization
6clonning
7.new keyword.

Answer Question  Select Best Answer