If Object is the super class of all classes, how it is inherited without extends statement?

santosh.dhulipala

 Profile Answers by santosh.dhulipala Questions by santosh.dhulipala

• Mar 5th, 2010

During the compilation process our JVM checks whether we are extending any class, if not it will will extend the object, which we know that is super class of all classes, which is defaultwe can check ...

Answer Question  Select Best Answer

Explain how a WeakHashMap works?

aryadipan

 Profile Answers by aryadipan Questions by aryadipan

• Sep 19th, 2010

You put an entry in a WeakHashMap with the object as the key, and the extra information as the map value. Then, as long as you keep a strong reference to the object, you will be able to check the m...

Answer Question  Select Best Answer

Explain the purpose of 'JDK','JRE',LIB' directories.

SoonamK

 Profile Answers by SoonamK Questions by SoonamK

• Nov 8th, 2010

JDK:Java Development Kit is needed for developing java applications.It includes JRE, set of API classes, Java compiler, Webstart and additional files needed to write Java applets and applications.JRE:...

Answer Question  Select Best Answer

What are the code standard used in J2EE project in real time?

venkatjdv

 Profile Answers by venkatjdv Questions by venkatjdv

• Jan 7th, 2011

1. If you open the java object, you must close that object otherwise it is still in heap memory and it causes some exception and it may effect the performance of the project.2. Naming Conventions....

Answer Question  Select Best Answer

For example:
Class A created with method m1() and its object created in various other files. later m1() changed to m2() and class has added some more public variable. Now question is how does object created in other files came to know about this change happened in its class.

Is Object Listener linked to this question???

Suraj Panwar

 Profile Answers by Suraj Panwar Questions by Suraj Panwar

• Aug 5th, 2011

When we declare the m2 object.

Answer Question  Select Best Answer

sampra

 Profile Answers by sampra Questions by sampra

• Mar 13th, 2012

Code set of all env

Answer Question  Select Best Answer

Write a program for dynamic polymorphism without using method overriding?

Fathima

• Dec 16th, 2011

I believe we can acheive dynamic polymorphism using interface Example:

Code
span style="font-style: italic;">//Something
//some methods

Answer Question  Select Best Answer

Amit

• Jun 5th, 2012

The reason of wait,notify and notify all method is in Object class because monitoring happens in object level not on thread leave so it has to be in object class.

Answer Question  Select Best Answer

suvojyotysaha

• Apr 23rd, 2012

First ask yourself the question as to why is static used? Static helps us use those static members of the class directly, without creating an object. Second of all the outer classes are already perc...

Answer Question  Select Best Answer

Can we decalre java inner class as private and protected?
If yes....please explain
If No....please explain

Priya

• Jan 28th, 2013

If it is a Regular Inner Class or Static Inner class private and protected modifiers can be applied. If it is a method local inner class, then we can use only abstract or final modifier.

Answer Question  Select Best Answer

What is the difference between java command line arguments and C command line arguments?

Zaiggen

• Nov 27th, 2016

None, both input lines comes from the standalone input console before being processed by his respective bytecode call inside the class or C executable program. Inside each bytecode process will be taken by his respective wrapper to convert or represet the input data and handle it.

Answer Question  Select Best Answer

Means, Map is a pert of Collection framework but not included in Collection....only List, Set and Queue are included ....Why?

siddhi parkar

• Jul 1st, 2014

Map in an either interface or class it only stores or maps key to the object.although its not a collection its fully integrated with collection in terms of collection-view of map.

Answer Question  Select Best Answer

How switch from new tab to old tab and is this possible to use Applet and Swings in selenium?

veerendra

• Jul 23rd, 2015

You can use window handling in selenium webdriver. First get the handle of the parent window and write a for loop to switch to the child windows. String parentwdw=driver.getWindowHandle(); //write ...

Answer Question  Select Best Answer

While defining HashMap why String is used as key value over other object values?

Manish

• Oct 8th, 2015

It is immutable and hashcode of immutable objects has less possibility of hash collisions.

Answer Question  Select Best Answer

What are differences between Core Java and Java?

Raviteja alluri

• Oct 19th, 2015

The difference between Core Java and Java is Core Java : It will covers all basic things like OOPS concepts, Exception Handling, Collections, IoStreams etc Java : It will also covers oops concepts an...

Answer Question  Select Best Answer

Today we have a special function called Mystique Function.Mystique function for any value x is denoted by H(x). H(x) is defined as the count of positive integers such that (Let k be one of such positive integer)

1) x%k=0

2) for every integer z it satisfies (z^k-z)%k=0.

3) k>1

Now given a value x you need to print the sum of H(2)+H(3)+H(4)..H(x).

Rajesh Swarnkar

• May 8th, 2016

The condition 2 is not very clear.
"for every integer z it satisfies (z^k-z)%k=0"

How would I test the satisfiability against every integer z as they are infinite?

Answer Question  Select Best Answer

In the expression String.format("%2d", 5)
what are the things below, be specific. for example, if the thing is an operator, indicate whether it is binary/unary and whether it is arithmetic/logical/relational. If it is a method, indicate whether its static or not

a. String
b. .
c. format()
d. "%2d" and 5

meena

• Feb 16th, 2016

It returns a formatted string with a value of 5.

Answer Question  Select Best Answer

santh kumar

 Profile Answers by santh kumar Questions by santh kumar

• Mar 20th, 2007

 it's an additional information to sahoo's answer only. RequestDispacher is an Interface ,it provides two methods.  forward() and include() Precisely to this context, container ...

dile_sahoo

 Profile Answers by dile_sahoo Questions by dile_sahoo

• Mar 17th, 2007

In case of the Dispatching a request we can use the relative path.Incase of Forwarding a request it internally execute the RequestDispathcher.forward() and forward() method cannot be used to dispatch ...

Answer Question  Select Best Answer

Sarma

• Dec 1st, 2005

EJB is a Server side resident resource managable, trasactional, persistable, secure, reusable component.

Madhuroopa Soundararajan

• Jul 7th, 2005

Hi, Enterprise Java bean is a server side component. it contains business logic and no system level programming and services like transactions,threading,persistence and security as EJB serve...

Answer Question  Select Best Answer

jdemaste

 Profile Answers by jdemaste Questions by jdemaste

• Mar 31st, 2007

If an object X is serialized and you perform modifications then you can ensure that the serialVersionUID  matches the first one and can thereby decieve the JVM. There are limits altering log...

sudheer

• Aug 11th, 2005

No we cannot fool the JVM It willr eject the wrong one by checking class id and definitions 

Answer Question  Select Best Answer