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How to refresh a webpage automatically
How to refresh a webpage automatically,without using f5 key in key board
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
- 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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What is difference between War file and Ear file?
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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What is the main difference between jdk1.4 and jdk1.5
Rajesh
- May 31st, 2012
Different between jdk1.5 and jdk1.6 details Explain with code Example.?
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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Common Design Pattern
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();
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Java-Class variable Vs Instance variable
Some body please tell me what is the difference between class variable and instance variable???
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
- 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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Is servlet is thread-safe?
PriyankN
- Mar 27th, 2011
Servlet is not thread safe, but that is because of the class/instance variables. So care must be taken to provide synchronized access to class/instance variables. Synchronizing entire service or doGet/doPost methods is bad and should be avoided.
Neha
- Nov 18th, 2007
Servlet is not thread safe by itself but u can make it thread safe by synchronizing the particular line's of service method.
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What is the difference between light weight component(like swing) and heavy weight component(like awt).
srinivasaraobora
- Aug 12th, 2006
Hi Friends,In java the componenets are light weightcomponents and heavy weight components .light weight componenets are the componenets which are used less resources and light weight components have h...
srinivasaraobora
- Jul 24th, 2006
Hi Friends,In java the componenets are light weightcomponents and heavy weight components .light weight componenets are the componenets which are used less resources and light weight components have h...
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What is the difference between jsp tag and html tag
sivapurammani
- Jan 23rd, 2014
JSPs are residing in server-side where as in general HTML are in client side. In clear way we can say in server side we need to write the code in java format or HTML and other formats too. So at the...
Prasad MN
- Dec 17th, 2012
Both the tags are used to developing the web pages. HTML tags are static. Where as JSP tags are dynamic.
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What is the right way of writing the code to get the servlet information using public String getServletInfo()?
mani.sivapuram
- Feb 23rd, 2011
By using the page directive as given below<%@ page info="hi this is the way
to write the code for getServletInfo() method" %>
mabhijit
- Jan 11th, 2008
Some applets and applications, for example, the Java Web Server Administration Tool, display information about a servlet. This information can include a short description of the purpose of the servlet...
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In Distributable environment,what happens if our component throws an exception(may be checked/unchecked) to others who r using our component. we must handle here itself or let it leave to others to handle? plz. reply soon
Mahesh Tpt
- Nov 5th, 2007
In exception handling, we should use throw clause to throw the exception because exceptions in java are throwable. If any method calls the throw clause, it(throw clause) will tell "If you call me, You...
VenkitaKrishnan
- Apr 4th, 2007
If your component throws an exception, in most cases we should not catch the exception, otherwise the calling component will never know that an exception has occured.What we should do is to force the ...
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Difference between forward and sendRedirect
What is difference between forward and sendRedirect
srinivasaraobora
- Oct 13th, 2006
Hi,The forward action allows the request to be forwarded to another resource (servlet/jsp/HTMl> which are available in the same web-application (context).Where as in the case of Response.sendRedire...
Rukmangada K J
- Oct 13th, 2006
In sendRedirect we can forward the request to the file in another context path but in case of forward() method it only invokes the file within the context path....
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What is the difference between EJB3.0(CMP) and Hibernate
kumarsamba
- Dec 5th, 2009
The basic difference is EJB needs an application Server for its implementation whereas Hibernate needs only a web server for its implementation.
krishna_ballabh
- Jul 31st, 2009
EJB3.0 does provide the POJO features for ORM in JPA as well as all features of older version, in other word we can say that Entity Bean is no longer in EJB, to provide the same, specification is prov...
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What is the difference between jdbc1.1 and jdbc1.2?
vineelbachu
- Dec 18th, 2006
hai iam vineel. i would like to tell what i know regarding this question.1)in jdbc 1.1 the cursor can be moved only in one direction i.e in forward direction where as in jdbc 1.2 t...
vineel
- Dec 18th, 2006
Hai, I am vineel. I would like to tell what i know regarding this question. 1) In JDBC 1.1 the cursor can be moved only in one direction i.e in forward direction where as in jdbc 1.2 the cursor ca...
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What is the difference between Servlet over CGI?
ramesh.sure
- Jun 26th, 2008
CGI creates a process for every request.Servlet creates a Thread for every request.
subhasish_25
- Jan 11th, 2007
in cgi , a process is createdfor every client request or call....it increases memory space...whereas in servlet 1 process is created and then a thread is call for every client request
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What is DAO?
amreenkhader
- Jan 20th, 2012
DAO decides to recieve the appropriate application from java and implemeting it a runtime...during execution..
chetan.nellekeri
- Apr 18th, 2011
DAO is Data Access Object.This is a pattern is used in most of the project throughout the industry.This class is the main medium between JAVA and JDBC.
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Application Security
How will you make sure to develop Java/J2EE projects/applications secured from hackers?Justify how Java projects are more secured than other languages?
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Cloning
What is Cloning? Why we are using Cloning concept? and How many types of cloning?
sivapurammani
- Jan 23rd, 2014
Cloning is used in some of the ares of the Web Projects. Consider one example we are trying insert some data into DB then what we will do is we are create one java object for that(See creating java ob...
surendar
- Jul 16th, 2012
Cloning is the process of creating duplicate copy with current object state. We use this concept in real world like, eg: In Bike manufacturing company, we use cloning for creating same bike object,...
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