安装J2SDK,并练习设置path和classpath环境变量；编写一个打印出”HelloWorld”的Java Application程序，并编译运行；；熟悉一种目前常用的java集成开发环境的使用。-Installation of J2SDK, and practice setting path and classpath environment variables　the preparation of a print " HelloWorld"　program of the Java Application and run the compiler　 familiar with a currently used integrated development environment java use.