如何在包中编译类，以便稍后使用“java Program”执行它们。 （没有包名）？ [英] How can I compile classes in packages, to execute them later with "java Program" (without the package name)?

问题描述

我对Java中的javac和包有一个快速的问题。

I have a quick question regarding javac and packages in Java.

我有一个简单的程序（我们称之为Program.java），目前在以下目录：

I have a simple program (we'll call it Program.java) which is currently in the following directory:

• myRepository / myProgram

在myRepository / myProgram目录中的Program.java和其他.java文件中，我声明了包myProgram。* ，还包括 import myProgram。* ; 。

In Program.java and other .java files in the myRepository/myProgram directory, I have declared package myProgram.* and also included import myProgram.*;.

所以当我输入 javac myProgram / Program.java 时，它会编译很好，如果我输入 java myProgram / Program ，它运行正常。

So when I type javac myProgram/Program.java, it compiles fine and it runs fine if I type java myProgram/Program.

但是，我正试图获得.class文件将在 myRepository 目录中生成，而不是 myRepository / myProgram ，这是源文件所在的位置。我尝试了 javac myProgram / Program.java -d .. ，它在myRepository目录中生成了.class文件，但是当我尝试java Program时，它给了我以下错误：

However, I'm trying to get the .class files to be produced in the myRepository directory, not myRepository/myProgram, which is where the source files are. I tried javac myProgram/Program.java -d .. which produces the .class files in myRepository directory, but when I try "java Program", it gives me the following error:

线程main中的异常java.lang.NoClassDefFoundError：程序（错误的名称：myProgram / Program）。

Exception in thread "main" java.lang.NoClassDefFoundError: Program (wrong name: myProgram/Program).

有没有办法让.class文件显示在主目录（myRepository）中而不是源代码所在的位置（myRepository / myProgram）并且能够在myRepository中执行 java Program ？

Is there any way way I could get .class files to show up in the main directory (myRepository) instead of where the source codes are (myRepository/myProgram) and be able to execute java Program while inside myRepository?

推荐答案

最好将源代码放在目录source / myProgram上，并创建一个名为build的目录来放置.class文件。因此，你可以这样编译和运行：

You better put the source codes on the directory source/myProgram and create a directory called build to put the .class files. Thus, you can compile and run this way:

javac source/myProgram/Program.java -d build
cd build
java myProgram/Program

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