了解Java 的数据类型；掌握各种变量的声明方式；理解运算符的优先级；掌握Java 基本数据类型、运算符与表达式、数组的使用方法；理解Java 程序语法结构，掌握顺序结构、选择结构和循环结构语法的程序设计方法；通过以上内容，掌握Java 语言的编程规则。

-Understand the type of data -- Mastering various variable declaration mode, Understand operator precedence, Grasp the basic data types, Java operators and expression, the use of array method, Understand and grasp grammatical structure Java program structure, select and order cycle of grammatical structure programming methods, Through the above content, grasps the Java language programming rules.