说明：  Java是一门面向对象编程语言，不仅吸收了C++语言的各种优点，还摒弃了C++里难以理解的多继承、指针等概念，因此Java语言具有功能强大和简单易用两个特征。Java语言作为静态面向对象编程语言的代表，极好地实现了面向对象理论，允许程序员以优雅的思维方式进行复杂的编程
(Java is an object-oriented programming language. It not only absorbs the advantages of C + + language, but also discards the concepts of multi inheritance and pointer which are difficult to understand in C + +. Therefore, Java language has two characteristics: powerful function and easy to use. Java language, as the representative of static object-oriented programming language, perfectly implements the object-oriented theory and allows programmers to carry out complex programming with elegant thinking mode)