为什么?

为什么没有IDE?

使用Eclipse或Netbeans.两者都是免费都将指导您.两者都不会编写您的代码-但它们会在诸如此类的任务中为您提供帮助.

WHY?

WHY U NO IDE?

Use Eclipse or Netbeans. both are free Both will guide you. Both will not write your code - but they will help you during tasks like this.

jar文件本身必须位于类路径中，而不仅仅是包含它的目录中

The jar file itself must be in the classpath, and not just the directory containing it