113 عال - الفصل الثاني

[Programmer]

Chapter 2


Java Features:


1- Compiled and Interpreted.
Java is both compiled and interpreted.
Compiling: means the hole program can be and translated to machine language and executed in one time as package (Fast)
Interpreting: is translating each line the program in sequence to the machine language (Slow).



2-Object Oriented.
Object: is a distance of a class.
Object must have: A) Identify. B) State. C) Behavior.
Object oriented in programming means that you will deal with every code as object or class to solve computer problems.


3-Platform independent.
Java has independent platform that can be execute its programs in any operating system such as (Windows, Linux, Mac OS) without changing the codes.


4-Robust and secure.
Garbage collector is available in Java, That’s means after execution the program, some data well stay in the memory, Java automatically remove the garbage data from the memory and other temporary resources.
Exception


5-Distributed.
Means building programs that can be worked in different computers and getting the data and make the process of data in server, Java can make it easily.


6-Multithreaded.
Means more than one program in one program, the program calls thread. Some programs need that feature e.g. Games.


7-High performance.

[Programmer]

Difference between C and Java
·Java do not have size of and type def.
·Java do not have struct of and union.
·Java do not have auto, extern, register, singed, and unsigned.
·Java do not have not pointers.
·In Java the functions are without arguments is declared with empty parentheses not with any words. (Look it the example).
·Java has instance of and >>>.
·Java has labeled break & continue.
·Java has is object oriented program language.
Difference between C++ and Java
·Java do not support operator overloading.
·Java do not have template class.
·Java do not support multiple inheritance.
·Java do not have pointers.
·Java replaced destructor with finalize.
·Java do not have header files.
Java and internet
HotJava is a browser from Sun Systems by Java.
HTML based on Hypertext markup language.
Applet is the name of java file for the web pages purpose.
Browsers:
·HotJava form Sun Microsystems.
·Netscape Navigator.
·Internet Explorer from Microsoft.
·Mozilla Firefox.
Java hardware requirements
-Operating system at lease (Windows 95).
-A hard disk minimum 5 MB.
-A CD-ROM Requires.
-A sound card.
-8 MB Memory.
-Mouse and keyboard for input purpose.
Java software requirements
To develop or writing a Java program it’s required to install (JDK) Java Development Kit.
JDK is free to download and use from Java official site (http://sun.java.com).
Java file types
·.javac à is used to edit and compile.
·.java à for running only.
·.javap à applets.
·.javah à native or includes.
·.jdb à for debugger.
Now that you can write a java program without using IDE, java can be written in text pad or any text editor in the computer. If the file written in text editor it’s require to save it by any of the above Java files type.
Java standard library (API)
Abstract window tool kit, GUI program.

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[Programmer]

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