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½ñÌìÅöµ½ÁËÒ»¸öºÜ±ä̬µÄÎÊÌ⣬дÁËÒ»¸öºÜ¼òµ¥µÄHelloWord.java£¬ÄÚÈÝÈçÏ£º
package com.yanjiuyanjiu;
public class HelloWorld {
    public static void main(String args[]) {
        System.out.println("Hello World!");
    }
}
ÔÚeclipseÖÐÔËÐÐÊÇ¿ÉÒԵģ¬µ«ÊÇÔÚÃüÁîÐÐÏÂÔËÐÐ×ÜÊÇʧ°Ü¡£ÎҵŤ³ÌλÖÃΪ d:\workspace\HelloWorld\¡£
³¢ÊÔÁ˺ܶà´Î£¬ÈçÏÂ
d:\workspace\HelloWorld\bin\com\yanjiuyanjiu\>java HelloWorld
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld (wrong name: com/yanjiuyanjiu/HelloWorld)
    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.access$000(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: HelloWorld.  Program will exit.
Exception in thread "main"
d:\workspace\HelloWorld\bin\com\yanjiuyanjiu\>java -classpath .; HelloWorld
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld (wrong name: com/yanjiuyanjiu/HelloWorld)
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(Unknown Source)
    at java.lang.ClassLoader.defineClass(Unknown Sourc


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 }
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