Java Assignment

Features of Java Language:

1. Platform independence

Platform-independence means Java can run on different platforms. Java introduced virtual machine principle that could be operated in a virtual machine among different platforms of Java interface. Programs written using Java can be shared around the world. Java has nothing to do with the machine data types, Java Virtual Machine is based on the hardware and operating system, to achieve interpreted function. Java binary code is provided in the interface of different platforms.

2. Safety

Java programming is similar to C ++, C ++ learned reader will quickly grasp the essence of Java. It discarded the pointer to direct the operation to the memory address, the memory allocated by the operating system, to avoid viruses entering the system through a pointer. Java provides security program manager, to prevent unauthorized access to the program.
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3. Object-Oriented

To learn the object-oriented concepts it is necessary to learn the data encapsulated in the class. The primary objective to use the class is to achieve the program's simplicity and ease of maintenance. Characteristic of the object class encapsulation is inheritance, so that the program code is compiled only once, and then reuses the above characteristic. Programmers can use to focus on the design and application classes and interfaces. Java provides a number of generic object class, you can use the parent class method through inheritance. In Java, the class hierarchy is a single non-multiple of a sub-class and has only one parent. Inheritance Java provides classes and subclasses of Object as tree inverted tree.

4. Distributed

Java built on extended TCP / IP network platform. Library functions provided with the HTTP and FTP protocols to transmit and receive information methods. This allows the programmer to use files on the network and use native files as easy.

5. Robustness

Java is committed to checking program errors at compile and run time. Checking helps many developers to detect errors at early stage. Java memory reduces the possibility of manipulating their own memory error. Java also implements real array , avoiding possible coverage of the data, these characteristic features greatly enhance the Java application development cycle. And Java also provides Null pointer detection, array boundary detection, anomaly export, Byte code verification and other functions.

6. Interpreted

We know C, C ++ and other languages, are to be compiled for the CPU chip to generate machine code, run the code on that are related to the particular CPU. Java like C or C ++, not compiled for CPU chip, but the program is compiled into bytecode called a self "intermediate code." Byte code is very close to machine code file that can be interpreted in the provision of a java virtual machine (JVM) in any system.

7. Dynamic

The basic unit is composed of java program classes, some classes is to write your own, some are introduced from the class library, and the class is loaded dynamically at runtime, which makes Java can dynamically maintenance program in Division Environment and classification, unlike C ++, as later did not schedule library upgrade, if you want the program with a new library provides a function that need to modify the program.
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Application:

Internet:

We know that the earlier www can transmit only text and pictures while Java appears to achieve the interactive pages, which is a great revolution. Java can be used to write stand-alone applications. Java is an object-oriented language, Java language is similar to C ++ language, it has mastered the C ++ language programmers to learn Java language that is much easier! Java program needs to be compiled, it is placed on the Internet server, when users access the server, Java programs are downloaded to the local user machine, and interpreted by the browser to run. There are actually two Java programs: one is Java application that is a complete program, such as a Web browser. Another is Java applets that run in a Web browser program. Java program and its browser HotJava, provides a browser that allows you to run a program. You can draw from your browser directly play sounds, you can also play in the movie page, Java can tell your browser how to deal with new types of files. When we transmit video images at 2400 baud line, HotJava gets able to show these videos.

E-commerce:

E-commerce is a hot topic today, but the traditional programming language could not run the e-commerce systems , e-commerce requirements of the program code has basic requirements: safety, reliability, and operational requirements for doing business with customers around the world in different platforms through different machines. Java with its strong security, platform-independent and hardware-independent architecture, object-oriented language simple at the same time, occupy an unparalleled advantage in network programming language, and has now become the preferred language for e-commerce systems.

Development process:

1.Write the source file, use a text editor , such as Edit or Notepad , to write the source files. Do not use Word editor , since it contains invisible characters. Save the programmed source files together, the extension of the source file must be .java.

2. To compile Java source file, use the Java compiler ( javac.exe ) to compile the source file to get bytecode files.

3. To run Java programs the two categories --Java applications and java applets must be interpreted accordingly; Java application must be interpreted through bytecode file by the Java compiler (java.exe); while java applet must be interpreted by supporting Java standard browser.