Radhakrishna

• Dec 7th, 2006

yes,its possible.We can write an abstract class without any concrete methods,There is no restriction that the abstract class contains minimum of one abstract method.Eventhough without any abstract method we can write the abstract class.

rajeswari

• Nov 30th, 2006

Your statement is almost correct but..every abstract class need not contain abstract methods..means if one class does n't contain any abstract methods then also we can declare class as abstract..but if the class contains any abstract method then that class should be declare as abstract.

Answer Question  Select Best Answer

Radhakrishna Billa

• Feb 23rd, 2007

HI,  We can't get the session Id after the session has been destroyed.But there is a mechanism using which one method will be called before the session is going to be destroyed...

sivanesh.a

 Profile Answers by sivanesh.a Questions by sivanesh.a

• Dec 4th, 2006

Not possible.

Answer Question  Select Best Answer

lieni

 Profile Answers by lieni Questions by lieni

• Jan 16th, 2007

As single statements ++i  and i++  are the same only if you useif i is 0;a[i++]=xyz;  a[0]has the valuse xyz and i is now 1a[++i]=xyz;  a[1] got the values xyz and i is also 1 

sivanesh.a

 Profile Answers by sivanesh.a Questions by sivanesh.a

• Dec 4th, 2006

I= i++; // post increment.. ( takes more time bcos adds 1 with i (need extra register) ).i= ++i; // pre increment. (but here it just increments by 1)

Answer Question  Select Best Answer

richi.sankalp1990

 Profile Answers by richi.sankalp1990 Questions by richi.sankalp1990

• Apr 15th, 2010

A textbox can be validated using a JavaScript, by using a redirection to the JavaScript page ..say I need to check for username, then, we redirect the form to login.js (JavaScript for the ch...

jitendra224

 Profile Answers by jitendra224 Questions by jitendra224

• Apr 12th, 2010

Write with inscript<script type="text/javascript">function validateFormOnSubmit(theForm) {           var reason = "";&n...

Answer Question  Select Best Answer

Bhumika

• Dec 7th, 2006

In addition to this the reverse of transient is"serialPersistentFields "These fields should be stored by serialization."

HabazalCoonya

 Profile Answers by HabazalCoonya Questions by HabazalCoonya

• Nov 29th, 2006

volatile is 4 da threadings. in threadings u are having two types of memory. Main memory and threadings local memory. threadings local memory is like a screen shot of main memory. Like screenshot it i...

Answer Question  Select Best Answer

srikiran_bab@yahoo.com

• Jan 4th, 2007

By implementing SingleThreadModel interface in javax.servlet. package to your servlet you can make the servlet single threaded and another thing is it does'nt contains any methods the web server will takes care about your servlet

ambar

• Dec 28th, 2006

By using syn

Answer Question  Select Best Answer

sunil_chd

 Profile Answers by sunil_chd Questions by sunil_chd

• Feb 9th, 2007

No it will give compile time error. No main method found.

Guest

• Jan 16th, 2007

Hi u can use private static void main becoz it does not give any error while compiling but while executing u will get an exception.

Answer Question  Select Best Answer

snehlata

• Sep 24th, 2007

Static variables belongs to class only and they will execute when they are displayed in System.out.println() statement. By default they have a fixed value.e.g for integer 0for float 0.0Static block is...

praveen kumar sakhamudi

• Feb 9th, 2007

Static variable is also variable but every object share same memory locaction of static variable.
static block is block it have set of statements.
static block is execute first bec when ever.
class file is loded jvm static block is executed.

praveen kumar sakhamudi
(+91-9949735117)

Answer Question  Select Best Answer

SMART_PRATEEK2001

 Profile Answers by SMART_PRATEEK2001 Questions by SMART_PRATEEK2001

• Aug 1st, 2008

/* This only adds & removes the elts from an arraylist */class myArrayListSecond{ private static int maxsize; private static Object data[]; private static int index; public myA...

dgshivas

 Profile Answers by dgshivas Questions by dgshivas

• Feb 25th, 2008

When ever you try to use arrayList ,indirectly you are using Collection frame work.List implements Collection interface

Answer Question  Select Best Answer

Lakshmi Prathyusha

 Profile Answers by Lakshmi Prathyusha Questions by Lakshmi Prathyusha

• Mar 2nd, 2015

This is very easy way to under stand

Answer

• Mar 29th, 2012

A one-dimensional array is a structured collection of components (often called array elements) that can be accessed individually by specifying the position of a component with a single index value.Two...

Answer Question  Select Best Answer

What is the difference between inheritance and aggregation? When would you use one over the other

mvrao.bsc

 Profile Answers by mvrao.bsc Questions by mvrao.bsc

• Jun 12th, 2008

In Inheritance we have to extend the class where as in Aggregation no need to extend.Directly we can make use of other class in current class by creating object of other class(if required). 

mvrao.bsc

 Profile Answers by mvrao.bsc Questions by mvrao.bsc

• Jun 12th, 2008

What is the difference between inheritance and aggregation? When would you use one over the other?

Answer Question  Select Best Answer

Can HashMap store null values?If yes, how many?What is singleton class? Give one example.Please describe the difference between 'int' and 'Integer',what is the purpose of 'Integer', where should we use 'Integer' vs 'int'?

sushilbehera

 Profile Answers by sushilbehera Questions by sushilbehera

• Jan 29th, 2010

Yes HashMap can store null values. Any number of null values can be stored.Please note null can be stored multiple times as value however only one time as key.

fcasttro

 Profile Answers by fcasttro Questions by fcasttro

• Mar 22nd, 2008

Map Won't allow duplicates, So It will accept one null value.HashMap map = new HashMap();map.put(null, null);map.put(null, null); map.put(null, null);After adding 3 null key / value pairs. It will...

Answer Question  Select Best Answer

50,000 HTML files are in a folder on a windows machine. Among them, content of some files(not the file names) contain the sentence "SocioMaC-Jus' Follow!". Write a Java program to count the number of such files.

kneebrains

 Profile Answers by kneebrains Questions by kneebrains

• Oct 30th, 2009

If you need to _search_ random strings - use lucene. Otherwise i think sarje has the answer. Can you not write the text parsing in the file filter ?

Sarje

 Profile Answers by Sarje Questions by Sarje

• Aug 20th, 2009

You can count the number of .html .htm files having any pattern suppose "Ram" using following code.import java.io.*;import java.util.Scanner;public class HtmlFileFilter implements FileFilter...

Answer Question  Select Best Answer

Why should we set class path and path environment variables while installing J2SE and why not while Turbo C?

richakharya

 Profile Answers by richakharya Questions by 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

 Profile Answers by mnazhar Questions by 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...

Answer Question  Select Best Answer

What happens when you add a double value to a String?

mani.sivapuram

 Profile Answers by mani.sivapuram Questions by mani.sivapuram

• Mar 14th, 2011

Here consider String s="java"; Double d=new Double(1.4); Here when we write s="java" an object of type String is created and it is referenced to 's'.In the similar way when we write Doub...

Sarje

 Profile Answers by Sarje Questions by Sarje

• Aug 20th, 2009

When you add Double value to a String first the double value will be converted to String and appended to original String and new compelet String object will be created.For exam:String str = "Ram";Double d = new Double(12.50d);str = str + d;now str is "Ram12.50"

Answer Question  Select Best Answer

What is the default capacity and load factor in Java Collection? Explain its role.

Sarje

 Profile Answers by Sarje Questions by Sarje

• Aug 20th, 2009

Default Capacity of any Collection say HashSet is 16. It means when you create a HashSet using its default constructor then first HashSet will be created to hold 16 elements  or you can say that ...

myogeshchavan97

 Profile Answers by myogeshchavan97 Questions by myogeshchavan97

• Aug 14th, 2009

The Default Capacity is 16 and Load Factor is 0.75

Answer Question  Select Best Answer

When will you use an interface and abstract class?

mani.sivapuram

 Profile Answers by mani.sivapuram Questions by mani.sivapuram

• Mar 8th, 2011

the simple way we can answer is in interface we can provide only abstract methods(i.e the methods with out any implementation) and in abstract class we have abstract methods as well as concreate metho...

deepthis594

 Profile Answers by deepthis594 Questions by deepthis594

• Dec 27th, 2010

Interface is also used as an alternative to multiple inheritence in java

Answer Question  Select Best Answer

The program should then output numbers in ascending order.

vishnu

• Feb 24th, 2012

import java.util.Iterator;
import java.util.Scanner;
import java.util.SortedSet;
import java.util.TreeSet;


public class ascend {

static int i=0;
public static void main(String[] args)
{
SortedSet elements = new TreeSet();
for(int j=0;j

NARESH KUMAR

• Feb 3rd, 2012

Code syntax is:- "java} import java.util.Scanner; public class A{ public static void main(String[] args){ Scanner scanner=new Scanner (System.in); int v1=s.nextInt();//value 1st i...

Answer Question  Select Best Answer

Difference between CompareTo and equals method.

siva

• Oct 21st, 2017

equals() method is derived from Object class which is a super class in java indirectly and this method is used to verify the content of the two objects if same return true otherwise return false. In ...

Bharat

• Oct 1st, 2012

CompareTo method which is present in the String class is used to check the two strings. It checks each character with the other String and if found equals then returns 0. Else negative value or positi...

Answer Question  Select Best Answer

What is JUnit and how it is used?

Satendra Kumar

• Nov 10th, 2014

JUnit is primary testing which is done by programmer to ensure that my code is a quality code.
we can used unit testing by creating test cases ........

Abhishek Mishra

 Profile Answers by Abhishek Mishra Questions by Abhishek Mishra

• Oct 10th, 2014

"java import org.junit.*; public class TestFoobar { @BeforeClass public static void setUpClass() throws Exception { // Code executed before the first test method ...

Answer Question  Select Best Answer