May 25th, 2010 
Jaffar Step to deploy WAR/JAR File in JBOSS
Popularity: 3% [?]
May 22nd, 2010 Jaffar String
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String are immutable object.Its value cannot be changed(constant).String object are readonly.If you create one instance of string and change the value of string then it create new instance.
String Buffer
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String Buffer is mutable.Its Value can be Changed.If you create one instance and append the text without creating a new instance
Example:
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String
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String str=”welcome”;
str + = “to fordevs”;
String Buffer
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StringBuffer strbuff=new StringBuffer(“welcome”);
strbuff.append(“to fordevs”);
Both code give same output but Second approach much faster than first one.
Popularity: 3% [?]
March 21st, 2010 Jaffar To Find the 2nd Maximum Of Mark in a Data Set
SELECT * FROM Student a WHERE 2=(SELECT count(DISTINCT Mark) FROM Student b WHERE a.Mark<=b.Mark)
To Find the 2nd Minimum Of Mark in a Data Set
SELECT * FROM Student a WHERE 2=(SELECT count(DISTINCT Mark) FROM Student b WHERE a.Mark>=b.Mark)
To Find nth Maximum and Minimum
SELECT * FROM Student a WHERE n=(SELECT count(DISTINCT Mark) FROM Student b WHERE a.Mark<=b.Mark)
SELECT * FROM Student a WHERE n=(SELECT count(DISTINCT Mark) FROM Student b WHERE a.Mark>=b.Mark)
replace n with the corresponding number
Popularity: 5% [?]
November 30th, 2009 Jaffar Step 1: Download Java – Decompiler from
http://download.cnet.com/windows/3055-2213_4-10046809.html?tag=pdl-redir
Step 2: Install the Java – Decompiler in your PC.
Step 3: Go to All Programs –> DJ Java Decomplier –> DJ Java Decomplier.
Step 4: Select File –> Open then Choose the Class File in File Dialog box.
Step 5: Java File is created from class File.
Popularity: 7% [?]
October 31st, 2009 Jaffar
Popularity: 17% [?]
May 30th, 2009 Jaffar Combination of java and JDBC is very useful to lets the programmer run his/her program on different platforms. Java programs are secure, robust, automatically downloaded from the network.JDBC API enables Java applications to interact with different types of databases.
Some of the advantages of using Java with JDBC are
• Easy and economical
• Continued usage of already installed databases
• Development time is short
• Installation and version control simplified
JDBC does the following three things
• Establish connection with a database
• Send SQL statements
• Process the results
Popularity: 1% [?]
May 29th, 2009 Jaffar Network is nothing but a set of computers which are physically connected together.internet is a network of networks.
Protocols:
Different networks requires certain set of rules called protocols.java networking is done using TCP/IP protocol
Different types of protocols are also available in this protocol they are:
*Http(Hyper Text Transfer Protocol)
*FTP(File Transfer Protocol)
*SMTP(Simple Mail Transfer Protocol)
*NNTP(Network News Transfer Protocol)
Sockets:
Sockets is used to plug in just like a electronic sockets.it is essential that they should follow a set of rules to communicate called protocols.
TCP/IP as protocol for communication and IP addresses are the address of the sockets.
Client/Server:
A computer request some service from another computer,is called a client.one that processes the request is called server.A server waits till one of its clients makes a request.it can accept multiple connections at a time.Multi-threading is used to serve multiple users at the same time.
Internet Addresses:
Every computer are connected to a network has a unique IP address.An IP address is a 32-bit number which has four numbers separate by periods.it is possible to connect to the Internet either directly or by using internet service provider.By connecting directly to the internet,the computer is assigned with a permanent IP address.
InetAddress:
InetAddress is one class,which is used to encapsulate th IP address and the DNS.to create a instance of InetAddress class,factory methods are used as there are no visible constructors available for this class.
Methods:
static InetAddress getLocalHost() //Returns InetAddress object representing local host
static InetAddress getByName(String hostname) //Returns InetAddress for the host passed to it.
Popularity: 2% [?]
May 27th, 2009 Jaffar Threads:
Thread is a line of execution.In a single-threaded system there is only one execution line (i.e) only one part of program is in the process of execution at any one time
To create a new thread:
Thread mythread = new thread(this);
this referes the current applet & mythread is a variable
Example:
import java.awt.*; import java.applet.Applet; public class MovingBall extends Applet implements runnable { Thread mythread=null; int position=0; public void start() { mythread=new Thread(this); mythread.start(); } public void run() { while(true) { for(position=0;position) { repaint(); try {mythread.sleep(100); } catch(InterruptedException e) { } } } } public void stop() { mythread.stop(); mythread = null; } public void paint(Graphics g) { g.setColor(Color.gray); g.fillOval(position,50,30,30); g.setColor(Color.black); g.fillOval(position+6,58,5,5); g.fillOval(position+20,58,5,5); g.drawLine(position+15,58, position+15,68); g.drawLine(position+12,68, position+15,68); g.drawLine(position,45,30,30,-50,-70); } }
Popularity: 6% [?]
May 26th, 2009 Jaffar 1.Copy a Specify File From One Location to Another.
2.Copy all the File From One Folder to Another.
3.Move all the File and Sub-Folder From One Folder to Another.
Popularity: 2% [?]
May 23rd, 2009 Jaffar Presuming : you downloaded this update through Window Updates and not manually
Remove Window Update downloads from the temporary folder:-
1.Stop the Automatic Updates service (Click Start, Choose Run.
In the Run box, type services.msc.Click OK.Right-click the Automatic Updates service.Click Stop.Stopping the service will take a moment.)
2.Delete the contents of the Download folder(Click Start. Choose Run.In the Run box, type %windir%\SoftwareDistribution
Click OK.Open the Download folder. Delete all contents of the Download folder.Close the window.)
3.Start the Automatic Updates service(Click Start. Choose Run.
In the Run box, type services.msc.Click OK.Right-click the Automatic Updates service.Click Start.Starting the service will take a moment.)
By deleting the contents of the Download folder - you have removed any downloaded updates.
Popularity: 11% [?]
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