如何用.jar库编译Java程序 [英] How to compile Java program with .jar library

问题描述

我不能让javac识别外部.jar文件，我想要扩展的类。我有两个文件在同一个目录：TestConsole.java和acm.jar。我使用以下命令从同一目录进行编译：

I can't make javac recognize an external .jar file, whose classes I'm trying to extend. I have two files in the same directory: TestConsole.java and acm.jar. I'm compiling from the same directory using the following command:

javac -classpath。：acm.jar TestConsole.java

但看起来javac只是忽略acm.jar。它给我错误：

But it seems like javac is just ignoring acm.jar. It gives me the error:

TestConsole.java:1: package acm does not exist
import acm.program;
          ^

当然，acm.program是acm.jar中的一个包。 acm.jar中的所有类都已编译;我只是想在我的课程中使用它们，而不是编译它们。

Of course, acm.program is a package in acm.jar. All of the classes in acm.jar are already compiled; I just want to use them in my classes, not compile them.

我做错了什么？

我在Mac上运行这个，并且acm.jar的目录结构似乎是有效的：它包含一个 acm / program 目录，它有 ConsoleProgram.class 是 TestConsole 扩展的唯一类。

I am running this on a Mac, and the directory structure of acm.jar appears to be valid: It contains an acm/program directory, which has ConsoleProgram.class, the only class that TestConsole extends.

javac -classpath：acm.jarTestConsole.java 不起作用。

推荐答案

检查清单：

1. 您在acm.jar中的课程显示为：
   

   acm / program /CLASSX.class
   

   acm / program / CLASSY.class

1. your classes in acm.jar appear as:

   acm/program/CLASSX.class

   acm/program/CLASSY.class

当使用jar tf acm.jar进行倾销时

when decanted with jar tf acm.jar

您正在导入它们：

import acm.program .CLASSX;

或

import acm.program。*;

import acm.program.CLASSX ;

or

import acm.program.* ;

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