How To Install & Configure Java JDK On Your Computer?

How to enable your computer for java programming?

First,download Java Development Kit(JDK) form one of the following addresses-

http://www.oracle.com/technetwork/java/javase/downloads/index.html

http://download.cnet.com/Java-Development-Kit-32-bit/3000-2218_4-12091.html

http://download.cnet.com/Java-Development-Kit-64-Bit/3000-2218_4-75317068.html

http://java-development-kit-jdk.en.softonic.com/

Double click the downloaded file(in our example,it should be named as  jdk-7u6-windows-i586.exe) and follow the installation process,there will be two installations,one for the JDK, another is JRE(Java Runtime Environment).

After the installation,go to Command Prompt by pressing Windows Key+R. Type java -version and hit enter,it'll show interpreter's version. Then type javac -version and hit enter. If the javac command completed successfully then you don't have to follow the steps below. But,if you get an error like this-  'javac' is not recognized as an internal or external command,operable program or batch file ,then do the following-

Go to Start -> Control Panel -> System -> Advanced System Settings -> Environment Variables, select the system varable named "Path" and click the Edit button. Add the address of java's bin sub-directory at the end of the list in the Variable Value field(in our example C:\Program Files\Java\jdk1.7.0_06\bin) then click the ok button.

To test the environment open command prompt by pressing Windows Key+R.

Type java -version and hit enter to see interpreter's version number.

And type javac -version and hit enter to see compiler's version number.

Both the versions should match. If it matches,you're ready to do java programming!

Note: Other than java programming,if you install the jdk,you'll be able to run java-archives(i.e .jar files) on your computer! There are plenty of java applets(small applications) are available on the internet for free! Also java is needed for surfing various internet sites.

That's all!

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How To Do Geocaching Or Treasure-Hunting With Your GPS Enabled Nokia Phone

Today I'll tell you how to do Geocaching or Treasure Hunting with your GPS enabled Nokia phone.

First of all,what Geocaching is? It's a very famous and well played game in foreign countries,like USA,and UK. They even buy a separate GPS device(shown in figure below) to play Geocashing,but you don't need to buy anything to play the game!

You can also locate your car or bike from a crowded parking area after learning this,so read on!



It's a multiplayer outdoor activity game,in the game there's a game master or host,who gives 'Locations' or 'Landmarks' to the players. And others are players who have to follow the directions given by their mobile phone to reach to the treasure!

It can be played between 2 or more players,and the one who reaches to the destination first,is the winner! And others are 2nd or 3rd accordingly.

Now,how to do Geocaching with a Nokia phone? For S60v3 phones(like Nokia N79,N82,6220) open "GPS Data" from menu.



For S60v5 phones(like Nokia 5800,5230,5235) open "Location" then choose "GPS Data".



To create a landmark,go to the place to be bookmarked,open "GPS Data" go under "Navigation" tab,press Options > select "Save Position".



You can make several Landmarks of your favorite places. To edit,manage and organize all your landmarks,go to the "Landmarks" option from menu on a S60v3 device,or "Location" > "Landmarks" on a S60v5 device.



You can send your Landmarks to other GPS enabled Nokia devices via bluetooth from- "Landmarks" > Options > "Send".

Now, I'm showing you step by step how to play the game from my side as a player-

1. I've received the landmark of the place where the treasure is, via bluetooth in my inbox.

2. I've saved the landmark from "Options" > "Save". It got saved in "Landmarks".

3. I've opened "GPS Data', have loaded my destination landmark from Options > "Set Destination" > "Landmark". In this case,the landmark is named 'Treasure'.



4. Now my mobile is searching for satellite.

5. Connection is established and it's now showing how far I'm from the treasure and also the direction of the treasure respective to my current location,just like a digital compass.



6. The red dot is indicating the the direction of treasure(which is in east-south direction).
Now if I move towards the treasure,my distance on the screen will decrease,and if I go away from it,distance will increase. By that I can know whether I'm going in right direction or not.

7. Now I'm near a 4way-crossing,and it's showing that I'm 78m away from the treasure and I've to take right turn(as the red dot is at right side of circle).

8. After taking right turn and going 79m straight, I've reached to the treasure! I'm a winner! Yahoo!!!




Apart from the fun,there are also some benefits of playing Geocaching-

1. It helps to reduce obesity! It helps you to stay fit and active :-)

2. If you have got lost in a unknown location,(like in a jungle),and there's no network coverage,but fortunately you had previously made landmark of your hotel. You can easily navigate to your hotel,because this Geocaching does not need network or internet connection like Google Maps,it only needs satellite which is always over your head.

3. It develops your outdoor activity skills. It is a must know before going to any hilly or forest areas for camping or vacation.

That's all!

GPS stands for Global Positioning System,it's a network of 24 satellites in space. By help of them you can find your exact location anywhere on the earth.

If you have any new ideas about this game or want to share your own experience, please share to me via this blog or via Orkut,Titter or Facebook,my user name is Sujoy70.

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