如何使用 .jar 库编译 Java 程序

问题描述

我无法让 javac 识别外部 .jar 文件，我正在尝试扩展其类.我在同一个目录中有两个文件:TestConsole.java 和 acm.jar.我正在使用以下命令从同一目录编译:

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

但似乎 javac 只是忽略了 acm.jar.它给了我错误:

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；我只想在我的类中使用它们，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 上运行它，acm.jar 的目录结构似乎是有效的:它包含一个 acm/program 目录，其中包含 ConsoleProgram.class，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.jar" TestConsole.java 也不起作用.

推荐答案

检查清单:

1. 您在 acm.jar 中的类显示为:

   acm/program/CLASSX.class

   acm/program/CLASSY.class

1. your classes in acm.jar appear as:

   acm/program/CLASSX.class

   acm/program/CLASSY.class

当用 jar tf acm.jar 倒出时

when decanted with jar tf acm.jar

您正在像这样导入它们:

You're importing them like:

导入 acm.program.CLASSX ;

或

导入 acm.program.* ;

import acm.program.CLASSX ;

or

import acm.program.* ;

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