Java 类路径问题“。” 与'./*'

Question

I am trying to compile and run from the command line a simple java hello world program.

It compiles and runs successfully when I do:

> javac HelloWorld.java
> java HelloWorld

However, when I place a jar-dependency in this hello world program and the corresponding jar in the same directory, I run into a classpath issue.

I can compile with:

> javac -cp ./* HelloWorld.java

But I when I attempt to run while specifying the classpath to the jar, my HelloWorld class is not found.

> java -cp ./* HelloWorld
Error: Could not find or load main class HelloWorld

When classpath is ./* , the jar is found but not the class, and when classpath is . , the class is found but not the jar.

I also tried specifying both, but the main class is not found whenever I use a : in the classpath.

> java -cp "./*:." HelloWorld
Error: Could not find or load main class HelloWorld

How can I specify classpath for java to find both the jar and my class?

Answer 1

In powershell, one solution is to use ; instead of : .

Ie this works in powershell:

> java -cp "./*;." HelloWorld
hello, world

The idea to try that came from an answer to this question: