java语言特点_总结（Java language features _ summary）.doc

java语言特点_总结（Java language features _ summary） Compared with the C++ language, Java removes the complexity and two semantic components of the C++ language, and adds the components of security and portability. Java language has the following characteristics: simple, object-oriented, platform independence, portability, interpretation, dynamic, high performance, reliability and security, multithreading, distributed processing etc.. The main features of the Java language are described below 1. simplicity To streamline the Java system, but full-featured; language style similar to C + +, but easier to master than the C + + program, and abandon the wrong place easily lead to C++, such as pointer operation and memory management; provide a rich class library. 2. object oriented The Java language is a purely object oriented language, and the structure of a program consists of more than one class and / or interface. Programs are designed to focus on classes and objects, inheritance and interfaces. Through the inheritance mechanism, subclasses can reuse the software code by using the attributes and methods provided by the parent class. 3. platform independence Java is a platform independent language, which means that applications written in Java can run on different hardware and software platforms without modification. There are two kinds of platform independent: source code level and target code level. C and C++% - the degree to which the source code level platform is independent, suggests that applications written in C or C++ do not need to be modified and can be run on different platforms simply by re compiling. Java relies mainly on the Java JVM (Java Virtual Machine) to achieve platform independence at the target code level. JVM is an abstract machine that is attached to a specific operating system. It has a set of machine instructions for the virtual machine, and has its own stack, register set, and so on. But JVM is usually implemented on software rather than on hardware.