idea上面合并在本地的代码如何撤回选择一：
1.删除PackageTest.java和ImportTest.java中packagecom.yeahgenius.test这句申明，2.输入setclasspath=c:\Study\Lesson3;%classpath%；然后输入cdc:\Study\Lesson3进入根目录下3、输入javacPackageTest.java4、输入javacImportTest.java5、输入javaImportTest选择二：输入mkdircomcdcommkdiryeahgeniuscdyeahgeniusmkdirtestcdtestcopyc:\Study\Lesson3\PackageTest.java.copyc:\Study\Lesson3\ImportTest.java.setclasspath=c:\Study\Lesson3;%classpath%javacPackageTest.javajavacImportTest.javajavaImportTest