java初学者：Could not find the main class?

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java初学者：Could not find the main class?
按书上说的编了一个：
public class DisplayWindom {
//main():应用程序入口
public static void main(String[] args) {
System.out.print("邓小平说：");
System.out.println("不管白猫、黑猫,能捉到老鼠的就是好猫.");
}
}
编译后执行时：
Exception in thread "main" java.lang.NoClassDefFoundError:d:/javaprogram/Displa
yWindom/class
Caused by:java.lang.ClassNotFoundException:d:.javaprogram.DisplayWindom.class
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)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
Could not find the main class:d:/javaprogram/DisplayWindom.class.Program will
exit.

上面的说对了一点,直接看就是找不到main();
1:上面说的,main()方法所在的类必须是主类,文件名和该main()所在类同名.
2:上面没错的话就是找不到你的.class文件.原因就是classpath和包名机制,
classpath就是JVM（虚拟机）加载类的时候所查找的路径之一,也就是自
定义class查询路径.在classpath下面找有没有你要运行的类.再一个就是
包名,在classpath下面在根据你的包名查找.如果你限定了包名的话!

java初学者：Could not find the main class? JAVAEclipse:could not find the main class,program will exit! could not find the main class.profram will exit 异常 hiisi1.6.3为什么出现could not find the main class.program will ex could find the main class：cz.vity.freerapid.core.MainApp.Pro could not find the required version of the Java(TM)2 Runtime java 警告:Could not find action or result could not find the hardware这是什么意思求 java java.sql.SQLException:The Network Adapter could not e could not find object Could not find process failed to find a Main Class