大学bash中的Java因NoClassDefFoundError而失败

Question

我知道有很多关于NoClassDefFoundError的帖子,他们似乎都在讨论jar文件.虽然我对日食中的java感到很自在,但我很遗憾为什么我能想到的最简单的东西不起作用,除非他们在大学方面打破了这个问题.

public class hello {
    public static void main (String args[]) {
            System.out.println ("Hello World!");
    }
}

这是整个hello.java程序,抛出这个:

Exception in thread "main" java.lang.NoClassDefFoundError: hello/java
Caused by: java.lang.ClassNotFoundException: hello.java
    at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: hello.java.  Program will exit.

$ CLASSPATH = /:在/ usr/JAVA /最新/ lib目录:/家庭/ 41 /名为myusername/bin中

java -verbose hello.class

得到:

[Opened /usr/java/jdk1.6.0_10/jre/lib/rt.jar]
[Loaded java.lang.Object from /usr/java/jdk1.6.0_10/jre/lib/rt.jar]
[Loaded java.io.Serializable from /usr/java/jdk1.6.0_10/jre/lib/rt.jar]
[Loaded java.lang.Comparable from /usr/java/jdk1.6.0_10/jre/lib/rt.jar]
[Loaded java.lang.CharSequence from /usr/java/jdk1.6.0_10/jre/lib/rt.jar]
[Loaded java.lang.String from /usr/java/jdk1.6.0_10/jre/lib/rt.jar]
[Loaded java.lang.reflect.GenericDeclaration from /usr/java/jdk1.6.0_10/jre/lib/rt.jar]
[Loaded java.lang.reflect.Type from /usr/java/jdk1.6.0_10/jre/lib/rt.jar]
[Loaded java.lang.reflect.AnnotatedElement from /usr/java/jdk1.6.0_10/jre/lib/rt.jar]
[Loaded java.lang.Class from /usr/java/jdk1.6.0_10/jre/lib/rt.jar]
...
[Loaded sun.misc.AtomicLong from /usr/java/jdk1.6.0_10/jre/lib/rt.jar]
...

再次例外.

java -version

得到:

java version "1.6.0_10-rc2"
Java(TM) SE Runtime Environment (build 1.6.0_10-rc2-b32)
Java HotSpot(TM) Server VM (build 11.0-b15, mixed mode)

Answer 1

首先,.java使用生成文件来编译文件.然后,使用该命令执行该类 - 使用该命令时不包括扩展名.javac hello.javahello.classjava hello.classjava

另外,我想指出,类名以大写字母开头是惯例 - hello应该是Hello.