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java入门第一季 1-3使用记事本编写java程序

 D:\ 的目录
2015-09-25  20:20    <DIR>          BaiduYunDownload
2016-03-02  14:48               427 HelloWorld.class
2016-03-02  14:10               134 HelloWorld.java
2015-10-10  08:21    <DIR>          MyDrivers
2015-09-24  19:23    <DIR>          QMDownload
2016-03-02  15:13    <DIR>          QQMusicCache
2015-08-31  19:05         3,915,561 setup_4.08.exe
2015-09-24  18:08    <DIR>          Windows
2015-10-23  23:08    <DIR>          Youku Files
2015-11-10  20:25    <DIR>          产品
2016-03-02  14:49    <DIR>          冰川上网客户端
2015-09-25  19:56    <DIR>          学习
2016-03-01  22:40    <DIR>          新建文件夹
               3 个文件      3,916,122 字节
              10 个目录 46,235,246,592 可用字节
D:\>javac HelloWorld.java
D:\>java HelloWorld.class
错误: 找不到或无法加载主类 HelloWorld.class
D:\>java HelloWorld
错误: 找不到或无法加载主类 HelloWorld