通过编写一个Java应用程序，掌握应用程序的典型结构，熟悉运算符、表达式和基本数据类型的使用，能够熟练掌握基本控制语句和容器结构的使用方法；熟悉JDK开发环境，能够使用JDK命令对Java程序进行编译、调试和运行； -By writing a Java application, application control the typical structure of familiar operators, expressions, and the use of basic data types, control statements can master the basic structure and use of container　familiar with JDK development environment, to use the JDK command Java program to compile, debug and run