Test ur Java Skills

Java Skills

C Language Video

C Video in English & Telugu

My Favourite sites

> http://www.softpedia.com/
> www.mathworld.com
> freshersworld.com

For uploading Video, Audio files, etc:
> http://www.megaupload.com
> http://www.mediafire.com
> http://bonus.depositfiles.com

Java Decompiler (JAD)

JAD is a Java decompiler that converts class files into Java source files with and extension ".jad". So change this extension ".jad" file into ".java" file and then we can use it as a java source file. Jad doesn't use the Java runtime for its functioning, therefore no special setup is required.
Jad can be used:
· For recovering lost source codes;
· For exploring the sources of Java runtime libraries;
· As a Java disassembler;
· As a Java source code cleaner and beautifier.
Download JAD

GUI tool - gnome-system-monitor

The gnome-system-monitor provides an overall view of the resource usage on your system, including memory and CPU allocation. Start gnome-system-monitor from Menus or just type in the terminal:

veeresh@veeresh-desktop:~$ gnome-system-monitor &

Pidgin messenger

Pidgin is a graphical modular messaging client based on libpurple which is capable of connecting to AIM, MSN, gmail, Yahoo!, XMPP, ICQ, IRC, SILC, SIP/SIMPLE, Novell GroupWise and Lotus Sametime all at once. It is written using GTK+.
You may modify and redistribute the program under the terms of the GPL (version 2 or later).
You can download and install from http://pidgin.im/

Top 5 Email Client For Linux, Mac OS X, and Windows Users

Linux comes with various GUI based email client to stay in touch with your friends and family, and share information in newsgroups with other users. The following are top five amazing piece of cross-platform software from various projects in the below link:

http://www.cyberciti.biz/tips/download-email-client-for-linux-mac-osx-windows.html

Avidemux Video Editor

Avidemux is a free video editor designed for simple cutting, filtering and encoding tasks. It supports many file types, including AVI, DVD compatible MPEG files, MP4 and ASF, using a variety of codecs. Tasks can be automated using projects, job queue and powerful scripting capabilities. Avidemux is available for Linux, BSD, Mac OS X and Microsoft Windows under the GNU GPL license.

Installing Avidemux in Debian/Ubuntu

veeresh@veeresh-desktop:~$ sudo apt-get install avidemux

We can also embed the subtitles to AVI by using Avidemux

20 Linux System Monitoring Tools Every SysAdmin Should Know

These tools provide metrics which can be used to get information about system activities. You can use these tools to find the possible causes of a performance problem. The commands discussed below are some of the most basic commands when it comes to system analysis and debugging server issues such as:

1. Finding out bottlenecks.
2. Disk (storage) bottlenecks.
3. CPU and memory bottlenecks.
4. Network bottlenecks.

as shown in the following link

top-linux-monitoring-tools

Installing LAMP On Ubuntu For Newbies

Install Apache

1. Open up the Terminal (Applications > Accessories > Terminal).

2. Copy/Paste the following line of code into Terminal and then press enter:

sudo apt-get install apache2

3. The Terminal will then ask you for you're password, type it and then press enter.

Testing Apache

To make sure everything installed correctly we will now test Apache to ensure it is working properly.

1. Open up any web browser and then enter the following into the web address:

http://localhost/

You should see a folder entitled apache2-default/. Open it and you will see a message saying "It works!" , congrats to you!

Install PHP

In this part we will install PHP 5.

Step 1. Again open up the Terminal.

Step 2. Copy/Paste the following line into Terminal and press enter:

sudo apt-get install php5 libapache2-mod-php5

Step 3. In order for PHP to work and be compatible with Apache we must restart it. Type the following code in Terminal to do this:

sudo /etc/init.d/apache2 restart

Test PHP

To ensure there are no issues with PHP let's give it a quick test run.

Step 1. In the terminal copy/paste the following line:

sudo gedit /var/www/testphp.php

This will open up a file called phptest.php.

Step 2. Copy/Paste this line into the phptest file:

Step 3. Save and close the file.

Step 4. Now open you're web browser and type the following into the web address:

http://localhost/testphp.php

The page should look like this:

Test PHP Page:

Congrats you have now installed both Apache and PHP!

Install MySQL

To finish this guide up we will install MySQL. (Note - Out of Apache and PHP, MySQL is the most difficult to set up. I will provide some great resources for anyone having trouble at the end of this guide.)

Step 1. Once again open up the amazing Terminal and then copy/paste this line:

sudo apt-get install mysql-server

Step 2 (optional). In order for other computers on your network to view the server you have created, you must first edit the "Bind Address". Begin by opening up Terminal to edit the my.cnf file.

gksudo gedit /etc/mysql/my.cnf

Change the line

bind-address = 127.0.0.1

And change the 127.0.0.1 to your IP address.

Step 3. This is where things may start to get tricky. Begin by typing the following into Terminal:

mysql -u root

Following that copy/paste this line:

mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('yourpassword');

(Make sure to change yourpassword to a password of your choice.)

Step 4. We are now going to install a program called phpMyAdmin which is an easy tool to edit your databases. Copy/paste the following line into Terminal:

sudo apt-get install libapache2-mod-auth-mysql php5-mysql phpmyadmin

After that is installed our next task is to get PHP to work with MySQL. To do this we will need to open a file entitled php.ini. To open it type the following:

gksudo gedit /etc/php5/apache2/php.ini

Now we are going to have to uncomment the following line by taking out the semicolon (;).

;extension=mysql.so

To look like this:

extension=mysql.so

Now just restart Apache and you are all set!

sudo /etc/init.d/apache2 restart

Quick note to anyone who encountered problems with setting up the MySQL password, please refer to this page: MysqlPasswordReset

Converting Java file to exe using exeJ

exeJ is a command line tool that creates a "batch-like" executable (.exe file) for your java application. The command line used to start your java application is wrapped in the generated executable and the user can simply start the java application with a double-click.
U can download exeJ from http://download.cnet.com/ExeJ/3000-2213_4-10107991.html?tag=lst-0-1

XDMCP

XDMCP stands for "X Display Manager Control Protocol" and is a network protocol. It provides a way of running the X-Terminal to run on your PC (or MAC) and it uses the X Server to provide a client/server interface between display hardware (the mouse, keyboard, and video displays) and the desktop environment while also providing both the windowing infrastructure and a standardized application interface (quoted from XFree86 Project home page). The X-Terminal can be displayed with an individual window or multiple windows, based on your X window system's software capabilities and setup.
By using X and XDMCP, you can build a good, reliable and not expansive X- environment for your home or work IT solution.
If you have access to do a graphical login on the local display of the Ubuntu box, this is extremely easy:

1. Click System, Administration, Login Window. (You'll be prompted for YOUR password at this point.)
2. Select the 'Remote' tab.
3. Change the 'Style' from 'Remote login disabled' to any of the other selections. (I went with 'Same as Local')
4. Once you have changed the Style, you will now have a 'Configure XDMCP' button in the lower right. (You don't have to change anything there, but good to take a look to see what you can change.)
5. Close 'Login Window Preferences'
6. reboot the system.

Login into XDMCP and select the host that u want to connect.

SSH

U can login into remote system using ssh and copy the files as follows:
open the terminal
veeresh@veeresh-desktop:~$ sudo su
[sudo] password for veeresh: ******
root@veeresh-desktop:/home/veeresh# apt-get install openssh-server
root@veeresh-desktop:/home/veeresh# service sshd status
root@veeresh-desktop:/home/veeresh# /etc/init.d/ssh restart

To login
root@veeresh-desktop:/home/veeresh# ssh root@192.168.3.183

To copy files from Remote system to ur system
scp ~/Documents/index.html AUSER@HOSTIP:Documents/index.html

Install Tomcat 5.5 in Linux

1. Necessary packages
veeresh@veeresh-desktop:~$ sudo apt-get install tomcat5.5 tomcat5.5-admin tomcat5.5-webapps

2. Directories
/usr/share/tomcat5.5/
/usr/share/tomcat5.5-webapps/
/etc/tomcat5.5
/var/lib/tomcat5.5
/var/log/tomcat5.5

3. Remember to export JAVA_HOME, for example (put in .bashrc)
veeresh@veeresh-desktop:~$ export JAVA_HOME=/usr/lib/jvm/java-6-openjdk/

Launch tomcat5.5 using

veeresh@veeresh-desktop:~$ sudo /etc/init.d/tomcat5.5 start
veeresh@veeresh-desktop:~$ sudo /etc/init.d/tomcat5.5 restart

4. Configuration for using Tomcat Manager (http://localhost:8180/manager/html) and Tomcat Administration (http://localhost:8180/admin).

5. Open the browser and enter: http://localhost:8180/

Samba Server

If you want to share files between your Ubuntu and Windows computers, your best option is to use Samba file sharing.

To install, first open a terminal window and enter the following command:

sudo apt-get install samba smbfs

We’ve got samba installed, but now we’ll need to configure it to make it accessible. Run the following command to open the configuration file, substituting your editor of choice:

sudo gedit /etc/samba/smb.conf

Find this section in the file:

####### Authentication #######

# “security = user” is always a good idea. This will require a Unix account
# in this server for every user accessing the server. See
# /usr/share/doc/samba-doc/htmldocs/Samba-HOWTO-Collection/ServerType.html
# in the samba-doc package for details.
; security = user

Uncomment the security line, and add another line to make it look like this:

security = user
username map = /etc/samba/smbusers

This will set Samba to use the smbusers file for looking up the user list.

Create a Samba User

There are two steps to creating a user. First we’ll run the smbpasswd utility to create a samba password for the user.

sudo smbpasswd -a

Next, we’ll add that username to the smbusers file.

sudo gedit /etc/samba/smbusers

Add in the following line, substituting the username with the one you want to give access to. The format is = “”. You can use a different samba user name to map to an ubuntu account, but that’s not really necessary right now.

< username > = “< username >”

Now you can create samba shares and give access to the users that you listed here.

Share User Home Directories

Installing gdesklets

gdesklets gives user a collection of impressive widgets that can be placed on desktop this is similar to feature available on Windows Vista and Mac OS X , it does provide quite a good look to the desktop.

To install gdesklets issue the following command at the command line
sudo apt-get install -y gdesklets
after installation go to (System -> Preferences -> Sessions) There go to Start up program and add gdesklets shell , now every time gnome loads up you should see your gdesklets on the desktop.

Installing the extra multimedia codecs,players

Now you would surely want to install all the codecs for playing various media files and the players primarily xine,vlc,mplayer issue the following commands to install the multimedia codecs.

sudo apt-get install gstreamer0.10-pitfdll gstreamer0.10-ffmpeg gstreamer0.10-glgstre am er0.10-plugins-base gstreamer0.10-plugins-good gstreamer0.10-plugins-bad gstreamer0.10-plugins-bad-multiverse gstreamer0.10-plugins-ugly gstreamer0.10-plugins-ugly-multiverse libx ine-extracodecs w32codecs vlc mplayer

Installing unrar

RAR is one of the very widely used archives on Windows , however unrar tool to decompress RAR is not shipped with distribution and has ti be installed manually.

sudo apt-get -y install unrar 

Installing MPlayer with all codecs and dvd playing support

MPlayer is one of the most popular media player available on linux , it supports playing all the major audio/video file formats . With w32codecs and libdvdcss2 it plays all the major audio/video format,however w32codecs has dll files from windows operating system hence its not available on the ubuntu official repositories and needs to be downloaded from the mediubuntu repositories.

To install MPlayer with all codecs type in the following command in the terminal window : -

sudo apt-get install mplayer
and
sudo apt-get install w32codecs libdvdcss2

After completing above steps you could launch MPlayer by typing in gmplayer in the terminal window or from (Application -> Sound & Video -> MPlayer Movie Player )

RealPlayer

Realplayer is one of the most popular cross platform media player available on Windows,Linux , Mac OS and a number of other platform . RealPlayer plays popular .rm ,rmvb,.mp3 and other media formats.

To install RealPlayer first download RealPlayer10GOLD.bin from http://www.real.com/linux/ assuming you have downloaded it to your home directory.

After downloading the file go to the directory where you have downloaded the file in terminal window and type
After installation is over type on the terminal

¨chmod +x RealPlayer10GOLD.bin¨

and

¨sudo ./RealPlayer10GOLD.bin¨

for installation to begin. Follow the instructions as presented to complete installation.
After installation is over you can launch Real Player from (Application -> Sound & Video -> Real Player 10 ).

Google Desktop Search

Google Desktop allows one to full text search of a user's e-mail, computer files, music, photos, chat, and Web pages viewed,OpenOffice documents , PDF files and more . Now similar tools already existed on Linux like beagle (supported by novell ) , meta tracker etc . However Google Desktop search is not based on any of these tools and uses its proprietary algorithms to search for files on the computer ,also being 1.0 release and more stable then these products it could be preferred over tools like beagle . To install type the following command in the terminal window : -
wget http://dl.google.com/linux/google-repo-setup.sh sudo bash google-repo-setup.sh Now after completing above steps to install Google Desktop Search type the following command in the terminal window : - sudo apt-get update sudo apt-get install google-desktop-linux
After completing above step logout of gnome session and relogin you would find the dialog window as shown.
select the appropriate option : -
Now after choosing appropriate option you would find Google Desktop icon in the system tray icon. Now it would automatically scan and index files on computer and store it in local database which could be searched using web browser.

How to setup Java classpath in Ubuntu?

The CLASSPATH is an environment variable that tells the Java compiler where to look for class files to import. CLASSPATH is generally set to a directory or a JAR(Java Archive) file.
It depends on what implementation of java you have installed, where it is installed, and a number of other things. Suppose in my system look like this:
open the terminal:

veeresh@veeresh-desktop:~$ JAVA_HOME=/usr/lib/jvm/java-6-openjdk/
veeresh@veeresh-desktop:~$ CLASSPATH=$CLASSPATH:/usr/lib/jvm/java-6-openjdk/bin
veeresh@veeresh-desktop:~$ export CLASSPATH
veeresh@veeresh-desktop:~$ echo $CLASSPATH
:/usr/lib/jvm/java-6-openjdk/bin

where ":" indicates appending new path to existing path.

How to Install Oracle

Installing Oracle on Ubuntu is fairly easy, since Oracle has created a Debian and Ubuntu package repository, so it is possible to download and install the Oracle database software using apt-get and aptitude.

Howto use the Oracle Debian and Ubuntu Repository:

Add the following lines to the /etc/apt/sources.list

# Oracle Repository
deb http://oss.oracle.com/debian unstable main non-free


Update the package repository database with:

cc@ray:~$ sudo apt-get update


Now you should be able to install the following Oracle software:

• libaio
• oracle-xe-client
• oracle-xe
• oracle-xe-universal

Install the Oracle Express packages

sudo aptitude install oracle-xe oracle-xe-client


Configure using:

sudo /etc/init.d/oracle-xe configure


Access the nice Oracle web interface by pointing your Firefox to:

http://127.0.0.1:8080/apex

Installing Macromedia Flash support and Sun Java JRE

Both Macromedia Flash and JRE are an important part of internet experience almost all the websites use either of the two technology to add extra functionality to the web page . By default Ubuntu does not come preinstalled with support for these two , however they can be installed quite easily by typing in the following command in the terminal window:
sudo apt-get install flashplugin-nonfree
and to install Sun Java JRE type:
sudo aptitude install sun-java6-jre sun-java6-plugin sun-java6-fonts

Installing Linux DC++ Client

DC++ is a popuar tool used for p2p file sharing and is especially popular in college campuses , to install dc++ for linux follow the following instructions .

Type the following command in the terminal window: -
sudo apt-get install linuxdcpp
And after completing above step launch dcpp from (Applications -> Internet -> DC++)



Linux Client of popular DC++ Application

Introduction

I was born at Adoni, Kurnool district, in Andhra pradesh 1985. My Father B. Narayana garu, and mother B. Lakshmi Devi garu. My father was good hardworker. He does not want to waste time unnecessarily. He cares very much about me & loving, caring & giving precautions. He is very strict in discipline towards us. My mom is very friendlier to me. She knoweth whatever things I have need of before I am asking her. My belief "Mother is the God's best gift" to everyone. I have one elder brother Narsimha Raju & sister Krishna veni. We were making funny things & quarreling always in childhood.
Adoni is a small town surrounding with small villages & with full of greenary scenarios. It is also called as "Second Mumbai" because this place is famous for cloth business.

My School days
From my early age My parents sent me to School named S.P.N.N.M convent. I began school career in 1988. I was simply sleeping in the classroom during class hours upto 3rd class. But my father was daily asking abt., the subjects. I, my brother, sister had to tell all the question & answers whatever taught in the class in every evening. Otherwise no supper in nights. So I was updating syllabus.
My father was waking up us 5:00 am daily and We had to revise the subjects from 5:00- 6:00 am. Like that daily one subject English on Monday, Telugu on Tuesday,... Hindi on saturday. He was giving holiday on every sunday.
So I was always stood Ist or IInd Rank in school. My teachers were also appreciating me. Thereby I got good impression among teachers. I got prizes for regular student because there was attendace report every year. I was getting 98-99% attendance every year. I got best student prize in my Vth class. There was my best teacher Janaki Madam. She was always knowing the problems of students, guiding & giving directions for my studies.
After my Vth class, I joined High school T.G.L.V. Govt., High School. There I faced some competition in studies. But I was maintaining my grade in top 3. i got 98/100 in Science subject in my VII class. For that I got prize & I became popular in high School. But my father want me to always as Ist Rank. He wants the best always. Anyway finally I managed my grade level.
I fond of music very much. One of my friend Suresh invited me to church ZION. I liked the piano, violin music in Sunday schools in the church. They taught so many stories & morals. I liked the simplicity & holiness in church.

College Life
M.P.C
In my Intermediate College Viswanarayana jr. College, again I faced lot of competition with different tallented students. I got 87% in Ist yr. Some other students got 92,94 %ages. I felt very unhappy. I realized the drawbacks in me after introspection in my life. They are good at English & communication skills. So they are scoring good marks in the languages which leads to be as top rankers in the class. Then I applied for improvement and I got 3rd Rank with 94%. I tried for Ist rank but I didn't get due to lack of knowledge in the languages. The first two rankers are girls. My class girls are very tallented. I was not talkative. I was afraiding of talking to girls. Anyway finally I got total 92.8% & stood top 4 in my town. For that I got BC scholarship & the top 10 rankers were published in Enadu news paper. That was my first achievement in my life.

Graduation
B.Sc M.P.IC, A.P.R.D.C, Kurnool.
After my Intermediate I have interested to do B.Tech CSE. I got good rank in EAMCET but i didn't join due to financial problems. I didn't know what should be next step life. My father was already fed up with financial problem. He didn't want me to study. he said me to do some job/work. I didn't know what I have to do. But I am very much interested to continue higher studies. I prayed God simply by telling my worries and giving concern to God. I got answer from God i.e., My High School Mathematics Teacher named Adivappa Sir helped & guided me to apply A.P.R.D.C for B.Sc.
I didn't have money to get applicaton. It costs 300/-. My neighbour had given amt. Actually he had taken rent in upstairs of my house. Finally I got State Rank 21 in A.P.R.D.C. I joined B.Sc MPIC in Kurnool in 2003.
In my first yr, full of ragging(singing, jumping like a frog, measuring with match sticks, salute) in the college. That was my first experience of ragging. I am afraiding of it. Most of the times I was escaping from ragging and spending time in library. Anyway after freshers party seniors & Juniors had good relationship like brothers. Seniors helped & guided me a lot in studies. There I knew how the life is. Because lack of facilities in the govt., college. Govt., was giving 12/- per day to each student for accommodation & food. Anyway I maintained good percentage 83% as well as enjoyed a lot like in Room day, Block day, Hostel Day, College Day festivals, cultural activities, competitions etc., This was the happiest life that I spent in my B.Sc.

Post graduation
MCA, S.V. University, Tirupati.
My specialization in B.Sc was Industrial Chemistry. I started preparation for M.Sc IC in II yr. But I changed my decission to do M.Sc physics in final yr., due to some of my teachers guidance. Finally I have written M.Sc physics entrance test & I also ICET (for MCA) bcz., of interest in CS. I got 46th rank in Sri Krishna devaray University, Anantapur. I decided to join M.Sc physics (free seat). But my Intermediate College Mathematics Lecturer named "Padmaja Madam" said me to do MCA which have lot of job opportunities comparing to MSc Physics. I am also interested in CS. But there were more financial problems in my family. Its a wild goose chase to do MCA for me bcz., I didn't have amt., or no facility of loan bcz., no one given surity even my father also. I had interest in higher studies still after my Degree. Acutally all this problem is not due to financial problem but due to improper planning to opt M.Sc/MCA. If I had a proper plan then I would have got good Campus (free) seat. Then I prayed God simply by putting every concern on him. Finally My madam & Sir helped me for Education loan. They took lot of concern on me to do MCA.
My MCA college was the worst college. I never saw such a college in my life. Even if intelligent student goes he will become dull. I wanted to left the college. But due to my Madam guidance I continued my MCA there. There was no classes, no good faculty, no good lab, etc., and also I don't know abt., computers. I felt the first program in C as Urdu language. I didn't understand anything like #include, main, etc., why all these? What's the purpose. My friends Mahukar, Chandu, Satish guided me to study Let us C-Yashwant Kanethkar. I got 66% in my MCA I sem. Its a very less percentate in my career. Having some experience I started studying on my own & going to coaching for C++, Java, .NET. in II, III, IV sems & in holidays without going to home. And also I decided to write GATE having a well plan in my MCA I yr. I attempted GATE in II yr. for practice. But I didn't get the rank first time. I prepared well & thoroughly. I got good AIR 820 with 95.4 %ile. Thus I came to know the maxim" A well thought plan has a high chance of success". I also got good percentage 74% in MCA & stood College Ist.

M.Tech CSE, NIT Calicut.
Even though I got good Rank my fate was not changed. Again financial problem. I had to pay 22,000/- admission fee to join M.Tech. My parents & sister have hope abt., my career towards job after my MCA. But still I have very much interest to continue higher studies in great IITs or NITs. I convinced them because doing M.Tech is similar to job. So I met P.S. Moorthy sir, English Retd., Lecturer, the founder of Swamy Vivekananda Samstha in my town. They helped me 9000/- and remaining amt., by my madam and some well wishers.
Some of my relatives commenting me that I am studying still without doing job. I didn't care any comments. My belief is "If you have interest you can do". That is my first preference in doing anything.
After arranging the amount, I came to NIT Calicut counselling with my friend Mallikarjun Reddy (Jubilee mate). He got 95.8 %le in GATE. But he didn't get call letter here unfortunately because he forgot to include study certificate (for his M.C.A VI semster) while applying. We tried to convince admin people so much but no use. Actually my friend is also from poor background family. Even though I got seat here, I felt very sad abt., my friend's fate because he is the best friend. Anyway he got seat in NIT Rourkela.
In my first semester, I thought that its easy very to study because all the syllabus is same as in MCA. But the way of teaching, Exams, Technical things are very high level here. After realizing, I changed my way of studying according to this pattern. I am very good at programming skills but not in Engineering. I believed that implementation is more important than other things. But after meeting with my HOD, I came to know that Engineering is more important than implementation. Anybody can do implementation if design and engineering is perfect. The programmer is only average human being.
I got some good friends, enjoying in programming, good climate, visiting places, facing high competition from keralians in studies. I have never seen such a cool & peaceful place like kerala in my life. This time my grade is 7th place because here they have good basics in their B.Tech & some experienced QIP students. Anyway I am very happy to be within Top 10 positions. I got 8. 16 CGPA in I year.

Java

java is pure object oriented programming language, robust and secure language.