order of javac classpath affecting whether classes can be found

Question

I have a jar file, MyClasses.jar , that contains a class MyReader . I have a client class BuildReader which uses it:

// BuildReader.java
MyReader reader = new MyReader();

BuildReader.java is in the current working directory for this example (and is the only file present). If I compile with:

javac -cp .:/path/to/MyClasses.jar BuildReader.java 

Then I get an error that javac can't find the class MyReader .

BuildReader.java:24: error: cannot find symbol
MyReader file = new MyReader();
^
symbol:   class MyReader
location: class BuildReader

However, if I compile instead with:

javac -cp /path/to/MyClasses.jar:. BuildReader.java

it compiles just fine. Everything I've looked at online suggest that the only thing that could be a problem is that perhaps there are other versions of MyReader about; there aren't. Can anyone help me to understand why the order of the javac classpath is causing compiler errors? I am not the creator of MyClasses.jar , if that's relevant.

Answer 1

您没有说，但是我敢打赌您正在使用Windows，其中的类路径分隔符为';'，而不是'：'。