How to refresh a webpage automatically,without using f5 key in key board

bondneoo

 Profile Answers by bondneoo Questions by bondneoo

• Jun 7th, 2010

This can only be done with JavaScript if it must be done by a command (as in with some sort of link, button, movement, etc.)<meta http-equiv="refresh" content="3;url=http://my.com/pa...

ggajanan

 Profile Answers by ggajanan Questions by ggajanan

• Jun 6th, 2010

Yes this above tag in your JSP code will auto reload the page itself after 4 seconds. Note: The quotes are avoided for obvious reason.

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patie

 Profile Answers by patie Questions by patie

• May 22nd, 2012

JAR - Java ARchive Its a file format based on the ZIP file format and similar to ZIP format this is also used for aggregating many files (many be of different types) into one aggregate file. This agg...

what is difference between War file and Ear file?

• Oct 12th, 2011

jar files: These files are with the .jar extension. The .jar files contain the libraries, resources and accessories files like property files. .war files: These files are with the .war extension. Th...

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Rajesh

• May 31st, 2012

Different between jdk1.5 and jdk1.6 details Explain with code Example.?

ramanujsaraswati

 Profile Answers by ramanujsaraswati Questions by ramanujsaraswati

• Jan 7th, 2009

Jdk 1.5 has various feature which was not in jdk 1.4. These new features are below-1)Annotation 2)AutoBoxing3)Enum support4)ForEach5)Generic implemention of Class, Method, WildCards, Bounded Type.6)Variable Argument support.

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What is command design pattern? Explain this pattern based on below scenario
Map m=new HashMap(); HashMap m=new HashMap();
What is difference between Map m=new HashMap(); HashMap m=new HashMap();

Thomas John

• Sep 22nd, 2015

Command decouples the object that invokes the operation from the one that knows how to perform it. To achieve this separation, the designer creates an abstract base class that maps a receiver (an obje...

Ganesh Bhat

• Apr 3rd, 2015

Map m = new HashMap(); here the reference of interface Map holds the object of HashMap, this is called Liscov Substitution Principle. OO Principles encourages to write implementation to interfaces tha...

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Some body please tell me what is the difference between class variable and instance variable???

sivapurammani

 Profile Answers by sivapurammani Questions by sivapurammani

• Jan 23rd, 2014

Class variable :: It is a variable which we can access this variable by using class name and another advantage is when the class loads in ClassLoader(i.e JVM) at that time itself the variable is initi...

qamrun

 Profile Answers by qamrun Questions by qamrun

• Nov 8th, 2012

Static variable, the field is allocated when the class is created. It belongs to the class and not any object of the class. It is class variable. Instance variable, the field is allocated when the c...

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Neharika Sanwasi

• Dec 28th, 2012

Public:
default:
private:
protected:

snehlata

• Sep 15th, 2007

there are 4 access specifiers defined in java.private: who can be accessed within class only.default:who can be accessed within the same package.protected: who can be accessed within the same package ...

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Parag jain

• Jul 5th, 2016

Data objects are collection of one or more piece of data and data type is only one type of data like int, char, float

Sukhrob

 Profile Answers by Sukhrob Questions by Sukhrob

• Dec 24th, 2015

Primitive data types like byte, short, int, double, long they store data while object only has reference to the declared data. When object type called it references to the declared type.

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Lakshmi Prasanna

• Aug 30th, 2017

java.* packages are the core Java language packages, meaning that programmers using the Java language had to use them in order to make any worthwhile use of the java language. javax.* packages are o...

amreenkhader

 Profile Answers by amreenkhader Questions by amreenkhader

• Jan 20th, 2012

Java is the extension of C++ language and javax files are those where it stores the entire program for execution in the form of files and termed as javax files

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sandeep sandy

• May 16th, 2016

If I would like to deal 1000s and lakhs of users, is it good to depends on Session pooling?

Is amazon maintaining persistable sessions?

ambika

• Apr 18th, 2007

Its nothing but connection pool

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CareerBaba.in

• May 7th, 2014

Opening database connection is a time consuming operation. Connection pooling increases the performance of the applications by reusing the active database connections instead of create new connection ...

mani.sivapuram

 Profile Answers by mani.sivapuram Questions by mani.sivapuram

• Feb 23rd, 2011

In the previous days database connections are maintained by database only for example oracle database is having 10 database connections are there.Consider at the same time 10 clients are asked for a p...

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What is singleton class? Explain with an example?

Shankar Tayi

• Mar 21st, 2007

Design patterns out of the way, let's look at the singleton. By now, you're probably wondering what a singleton is - isn't jargon terrible? A singleton is an object that cannot be instan...

cgr

• Mar 6th, 2007

To create only one object for a aclass

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r.praveenkumar  

 Profile Answers by r.praveenkumar Questions by r.praveenkumar

• Member Since Oct-2007 | Aug 1st, 2008

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when a variable is declared as final we cant change its value again. we use final variable to declare a constant so when we declare a variable as final and if we were allowed to not to give its value at the time of declaration it would not make sense so people who designed java made mandatory to give the value when we declare a final variable. then only it will be sensible.
final PI=3.14;
then we cant change PI's value. think if the above statement do not contain a vl it would not make sense.

Nitin Maulekhi

 Profile Answers by Nitin Maulekhi Questions by Nitin Maulekhi

• Jul 18th, 2012

final keyword can be applied on:- 1.class 2.member functions(only non-static) 3.data-members(both static and non-static) 4.local variables. 1.by making a class final ,that class cannot be inherited....

Rohit Verma

• Jul 10th, 2012

Like any variable, a final variable can also be first declared and then assigned a value. But it can be only assigned a value once and only once ( as its final variable ). for example :- final Strin...

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rekha

• Feb 13th, 2013

Can override init & destroy .
People used to make mistakes by overriding inti(ServletConfig).
Because if we override and forget to call super.inti(ServletConfig) then default actions doesnt get performed. As a result getServletConfig() will return null.

Praveen D

• Feb 1st, 2013

It is possible to Override init() & destroy() methods in servelts

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swatinanu

 Profile Answers by swatinanu Questions by swatinanu

• Aug 8th, 2011

Hash map is basically a collection API which is used to save data in sorted order avoiding duplicates. where hash table herits Object class. Hashtable is synchronized, whereas HashMap is not. This m...

Abid

• Jul 13th, 2011

The HashMap class is roughly equivalent to Hashtable, except that it is unsynchronized and permits nulls. (HashMap allows null values as key and value whereas Hashtable does not allow). HashMa...

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amreenkhader

 Profile Answers by amreenkhader Questions by amreenkhader

• Jan 20th, 2012

Java is the basic object oriented programmng language and Java script can be used in style sheets making and in HTML documentation

mani.sivapuram

 Profile Answers by mani.sivapuram Questions by mani.sivapuram

• Feb 23rd, 2011

java-script is also same as like java only.But java is used in server side scripting and the javascript is used in client side scripting. I will say a real time scenario here consider the normal user...

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What is the exact use of singleton class?Just using private class constructor makes it a singleton class?

Abhishek Marshetty

• Nov 18th, 2015

The Singletons purpose is to control object creation, limiting the number of obejcts to one only. Since there is only one Singleton instance, any instance fields of a Singleton will occur only once pe...

ayush48

 Profile Answers by ayush48 Questions by ayush48

• Jun 22nd, 2015

A class having only one object or only one object of that class can be created.

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dineshxp

 Profile Answers by dineshxp Questions by dineshxp

• Mar 19th, 2012

Java.util.date is used to show date and time of the system

java.sql.date is used to show the date of retrieved data from database and also it shows entered date to database

NarendraKumar

• Mar 6th, 2012

Explanation: public class ((java.util.Date extends java.lang.Object)) implements java.io.Serializ able,java.lang.Cloneable,java.lang.Comparable java.sql.Date extends the java.uti.Date cls obj so jav...

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Balram

• Sep 19th, 2016

Can anyone send some Java Project Architectures.

Rais pal Singh

• May 2nd, 2016

Can anyone send me project architecture diagram. and plz differentiate project architecture and project approach briefly. Does project architecture follows project approach.

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Srinu

• Jul 8th, 2017

Java class cant be private it throws compile time exception.
Illegal modifier for the class TestClass; only public, abstract & final are permitted

jay

• Dec 6th, 2015

Child class will not be able to inherit it.

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PriyankN

 Profile Answers by PriyankN Questions by PriyankN

• Mar 6th, 2011

The question itself is wrong. It should have been difference between Model1 and Model2. There is nothing called MVC1 in actual. The term MVC itself stands for Model-View-Controller, which clearly sepe...

paromita

 Profile Answers by paromita Questions by paromita

• May 23rd, 2009

In MVC 1, the view is not separate from the controller... ie the presentation logic as well as the business logic is written in the same place. However, in MVC 2, the view is separate from the control...

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