Install and Configuring JDK

Once we understand the concept of "class", it's time to start the download and installation programs (JDK).
JDK installer can be downloaded for free by using the help of google search, just type the keyword "Download JDK", or for more easy ways directly please click here. Approximately 54 Mb in size.

Immediately after the install files are successfully downloaded. Then after the installation is done successfully executed immediately in the configuration of the PATH environment variable. The aim is that the command "javac" or "java" can be directly executed on the command prompt from any directory. How to configure the PATH on Windows XP are as follows:
1. Sign on the properties of my computer (open the windows explorer and right click on my computer, then select Properties).

2. Select the advanced toolbar, then click the button Environment variables.

3. In the user variables for an administrator, select New, then enter the location of the JDK directory.

4. In the system variables, select New, then enter the directory location also JDK.


Until here has done the installation steps and configure the JDK PATH.

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class (concept & definition)

In the hierarchy, the human class is the highest class, where the entire state and behavior of such class owned derivatives class, namely class : class man and woman. Each of class woman and class man has particularly collection of state and special beahviour and only owned by each of these classes.

Class human as the highest class have state : age, weight, and height. With the behaviour are : eat, drint, and work.

Class man have state : have male organs. With behaviour : fertilize the female cells. While class woman have state : have felame organs. With the behaviour : pregnant, and breastfeeding.

As the member of class human, class man and class woman also have state : age, weight and height. With the behaviour : eat, drink, and work.

Here is seen the difference between class and object, where the class is used to describe a model or specification of an entity, while the object was real or a manifestation of the class itself.

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