java 无法使用包从命令行运行多类程序
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Can't run multiple-class program from command line using packages
提问by Dave Brock
This is my first time posting -- I found similar issues but not anything concerning this issue directly. This sounds very simple but I'm not quite sure why this is occurring. My program runs beautifully in Eclipse but not from the command line. I have a few classes within a simpletreepackage.
这是我第一次发帖——我发现了类似的问题，但没有直接涉及到这个问题。这听起来很简单，但我不太确定为什么会发生这种情况。我的程序在 Eclipse 中运行得很好，但不能从命令行运行。我在simpletree包中有几个类。
Here's BinaryTree.java:
这是BinaryTree.java：
package simpletree;
import java.io.*;
public class BinaryTree implements Serializable {
// Automatically generated UID
private static final long serialVersionUID = -3124224583476129954L;
BinaryTree leftNode; // left node
BinaryTree rightNode; // right node
// some code
}
class Tree implements Serializable {
private static final long serialVersionUID = 6591795896216994405L;
private BinaryTree root;
// some code
}And Program1Test.java:
和Program1Test.java：
package simpletree;
public class Program1Test {
public static void main(String[] args) {
Tree tree = new Tree();
// some code
}
}Here's the problem: doing this from inside simpletreecompiles fine:
问题是：从simpletree内部执行此操作可以很好地编译：
javac BinaryTree.java Program1Test.java
When I do this:
当我这样做时：
java Program1Test
I get this:
我明白了：
Exception in thread "main" java.lang.NoClassDefFoundError: Program1Test (wrong n
ame: simpletree/Program1Test)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.accessjava simpletree.Program1Test
0(Unknown Source)
at java.net.URLClassLoader.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: Program1Test. Program will exit.
Any ideas? I have my classpath set correctly and I've tried running with a package (simpletree.Program1Test) and without.
有任何想法吗？我的类路径设置正确，并且我尝试使用包 (simpletree.Program1Test) 和不使用包运行。
回答by Jigar Joshi
you need to
你需要
##代码##from dir above simpletree
从上面的目录 simpletree
Also make required classes available using -cp
还可以使用 -cp
回答by Dark Falcon
- Place your .class files in a subfolder named "simpletree"
Use this command line:
java simpletree.Program1Test
- 将您的 .class 文件放在名为“simpletree”的子文件夹中
使用这个命令行：
java simpletree.Program1Test
