从命令行编译java的问题 [英] Problems compiling java from command line
问题描述
这是文件夹结构：
C：。 $ b $b└───src$ b $b├───main$ b $b│└───java$ b $b│└───com$ b $b│└───myCompany$ b $b│└───Runner.java$ b $b│$ b $b└───test$ b $b└───java$ b $b└───com$ b $b└───── myCompany $ b $b└───BasicTest.java
这是BasicTest.java：
package com.myCompany;
import junit.framework.TestCase;
公共类BasicTest扩展TestCase {
public BasicTest（）{
}
public void testTrue（）{
assertTrue（真）;
}
}
这是Runner.java：
package com.myCompany;
公共类Runner {
public static void main（String [] args）{
BasicTest bt = new BasicTest（）;
bt.testTrue（）;
System.out.print（已完成）;
}
}
很简单，对吧？请继续阅读...
我尝试过：
时间编译BasicTest.java
C：\ workspace \BasicTest> javac -cp c：\ junit\latest \ junit -4.10.jar c：\ workspace \ BasicTest \ src\test\java \ com \ myCompany \ * .java
这很好用...
当我尝试编译Runner.java时，我得到了这个：
C：\ workspace \BasicTest> javac -cp c：\ workspace \BasicTest \src\test\java \ com \ myCompany c： \ workspace \ BASesTest \ src \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ pre> c：\ workspace \BasicTest \ src \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ com \ myCompany \ Runner.java：7：错误：找不到符号
BasicTest bt = new BasicTest（）;
^
符号：class BasicTest
location：class Runner
c：\ workspace \BasicTest \ src \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ .java：7：错误：找不到符号
BasicTest bt = new BasicTest（）;
^
符号：class BasicTest
location：class Runner
2错误
我用谷歌搜索，直到我脸红了，无法弄清楚这个错误。我理解错误，它是基本的，我想说的是我不明白为什么我得到它 - 我明确地给了编译器路径。
我一直在玩这个，并阅读设置类路径 [ ^ ]，并设法建立一个集合，虽然不是你拥有的完整目录树。使用简化的类路径树尝试以下操作：
javac -cp c：\ workspace \BasicTest \src\test\java c：\ workspace \\ \\ BASicTest\src\main\java\com\myCompany \ * .java
[edit]
因为（我认为）BasicTest是（暗示是）在包com.myCompany中编译器和运行时将在％CLASSPATH％\ com \ myCompany中搜索它，因此出现问题。
[/ edit]
@Richard MacCutchan，谢谢你的回复！
虽然我真的很困惑... ... >
引用：因为（我认为）BasicTest是（暗示是）在包com中.myCompany
这并不意味着。它是！两个源文件都以：
package com.myCompany;
Quote：使用简化的类路径树尝试以下操作：
隐藏复制代码
javac -cp c：\ workspace \BasicTest \ src \ test \ java c：\ workspace \BasicTest \ src \\\\\\\\\\\\\\\ \ * .java
这本身就会引发一堆错误......它没有考虑到junit jar。
当我修改你的建议时：
javac -cp c：\ junit \\ \\ _ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \ * .java
它有效!!!谢谢。
但这还没有解决。它编译 - 但是我无法运行：
C：\ workspace \BasicTest \src \ main \ java> java com.myCompany.Runner< br />
线程main中的异常java.lang.NoClassDefFoundError：com / myCompany / BasicTest< br />
at com.myCompany.Runner.main（Runner.java ：7）< br />
引起：java.lang.ClassNotFoundException：com.myCompany.BasicTest< br />
at java.base / jdk.internal.loader.BuiltinClassLoader.loadClass（BuiltinClassLoader .java：582）< br />
在java.base / jdk.internal.loader.ClassLoaders
AppClassLoader.loadClass（ClassLoaders.java:185）< br />
在java.base / java.lang.ClassLoader.loadClass（ClassLoader.java:496）< br />
... 1更多
Here's the folder structure:
C:.
└───src
├───main
│ └───java
│ └───com
│ └───myCompany
│ └───Runner.java
│
└───test
└───java
└───com
└───myCompany
└───BasicTest.java
Here's BasicTest.java:
package com.myCompany;
import junit.framework.TestCase;
public class BasicTest extends TestCase {
public BasicTest() {
}
public void testTrue() {
assertTrue(true);
}
}
Here's Runner.java:
package com.myCompany;
public class Runner {
public static void main(String[] args) {
BasicTest bt = new BasicTest();
bt.testTrue();
System.out.print("Finished");
}
}
Simple enough, right? Read on...
What I have tried:
Time to compile BasicTest.java
C:\workspace\BasicTest>javac -cp c:\junit\latest\junit-4.10.jar c:\workspace\BasicTest\src\test\java\com\myCompany\*.java
This works just fine...
When I try to compile Runner.java, I get this:
C:\workspace\BasicTest>javac -cp c:\workspace\BasicTest\src\test\java\com\myCompany c:\workspace\BasicTest\src\main\java\com\myCompany\*.java
c:\workspace\BasicTest\src\main\java\com\myCompany
c:\workspace\BasicTest\src\main\java\com\myCompany\Runner.java:7: error: cannot find symbol
BasicTest bt = new BasicTest();
^
symbol: class BasicTest
location: class Runner
c:\workspace\BasicTest\src\main\java\com\myCompany\Runner.java:7: error: cannot find symbol
BasicTest bt = new BasicTest();
^
symbol: class BasicTest
location: class Runner
2 errors
I've googled until I'm blue in the face and cannot figure this error out. I understand the error, it's elementary enough, what I'm trying to say is I don't understand why I'm getting it -- I explicitly gave the compiler the paths.
I have been playing around with this, and reading Setting the class path[^], and managed to get a set built, although not the complete directory tree that you have. Try the following, with the reduced classpath tree:
javac -cp c:\workspace\BasicTest\src\test\java c:\workspace\BasicTest\src\main\java\com\myCompany\*.java
[edit]
Because (I think)BasicTestis (implied to be) in packagecom.myCompanythe compiler and runtime will search for it in%CLASSPATH%\com\myCompany, hence your problems.
[/edit]
@Richard MacCutchan, thanks for the reply!
I'm really confused by a couple of things though...
Quote:Because (I think) BasicTest is (implied to be) in package com.myCompany
It's not implied to be. It is! Both source files start with:
package com.myCompany;
Quote:Try the following, with the reduced classpath tree:
Hide Copy Code
javac -cp c:\workspace\BasicTest\src\test\java c:\workspace\BasicTest\src\main\java\com\myCompany\*.java
That by itself throws a mess of errors... it's not taking into account the junit jar.
When I modify your suggestion like so:
javac -cp c:\junit\latest\junit-4.10.jar;c:\workspace\BasicTest\src\test\java c:\workspace\BasicTest\src\main\java\com\myCompany\*.java
It works!!! Thank-you.
But this still isn't solved yet. It compiles -- but I cannot run:
C:\workspace\BasicTest\src\main\java>java com.myCompany.Runner<br /> Exception in thread "main" java.lang.NoClassDefFoundError: com/myCompany/BasicTest<br /> at com.myCompany.Runner.main(Runner.java:7)<br /> Caused by: java.lang.ClassNotFoundException: com.myCompany.BasicTest<br /> at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)<br /> at java.base/jdk.internal.loader.ClassLoaders
AppClassLoader.loadClass(ClassLoaders.java:185)<br /> at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496)<br /> ... 1 more
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