转：有关package在javac和java中的基本用法
http://bbs.jlu.edu.cn/cgi-bin/bbsanc?path=/groups/GROUP_6/JAVA/D701E95FC/DBA8655C1/A85D59565
下面是一些需要注意的问题:
1, 如果类路径中需要用到 .jar 文件, 必须把 jar 文件的文件名放入类路径, 而不是
其所在的目录.
2, 在任何时候, 类名必须带有完全的包名,
3, "." 当前目录最好在你的类路径中.
下面是一些常见的编译和运行的模式.
4. To compile HelloWorld.java app in the default package in C:\MyDir, use
CD \MyDir
C:\jdk1.3\bin\Javac.exe -classpath . HelloWorld.java
5. To run a HelloWorld.class app, in the default package in C:\MyDir, use
CD \MyDir
C:\jdk1.3\bin\Java.exe -classpath . HelloWorld
6. To run a HelloWorld.class app, in the default package in a jar in C:\MyDir, use
CD \MyDir
C:\jdk1.3\bin\Java.exe -classpath HelloWorld.jar HelloWorld
7. To compile a HelloWorld.java app in C:\MyPackage, in package MyPackage, use
CD \
C:\jdk1.3\bin\Javac.exe -classpath . MyPackage\HelloWorld.java
8. To run a HelloWorld.class app in C:\MyPackage, in package MyPackage, use
CD \
C:\jdk1.3\bin\Java.exe -classpath . MyPackage.HelloWorld
9. To run a HelloWorld.class app in C:\MyPackage, in a jar in package MyPackage, use
CD \MyDir
C:\jdk1.3\bin\Java.exe -classpath HelloWorld.jar MyPackage.HelloWorld
(注: default package 指的是在程序中不指定任何包).
