java - Java, basic class path problems

Question

I've been writing simple programs in Java, but seem to run into problems where the class path is involved.

My compiled class files exists in the directory: /home/pi/code/java/eclipse/bin/

When in this directory I can run "java Controller" and the program will run.

Experimenting with the class path I tried the following:"java -cp /home/pi/code/java/ eclipse.bin.Controller"

But I get the following exception:

"Exception in thread "main" java.lang.NoClassDefFoundError: eclipse/bin/Controller (wrong name: Controller)
"

The weirdest thing is that Java even constructed the final section "eclipse.bin.Controller", e.g. I could tab it when i was typing the command, so I expected this to work.

My end goal is to point the class path at a JDBC driver.

Where am I going wrong?

Answer 1

java -cp /home/pi/code/java/eclipse/bin Controller

如果您的Controller课程在默认包中，那将是正确的方法。

如果您尝试引用您的类，eclipse.bin.ControllerJava 运行时将Controller在包中查找该类，eclipse.bin而包不是目录。