谁会剪高俊熙的短发:编译sampleBean.java时的错误！

sampleBean.java为：
package bean;
public class sampleBean
{
private String sample = "Start value";
public String getSample() {
return sample;
}
public void setSample(String newValue) {
if(newValue != null) {
sample = newValue;
}
}
}

DOS命令状态下错误为：
:\Documents and Settings\Owner>cd C:\Tomcat\webapps\myjsp\JSP-08

C:\Tomcat\webapps\myjsp\JSP-08>javac sampleBean.java

C:\Tomcat\webapps\myjsp\JSP-08>java sampleBean
Exception in thread "main" java.lang.NoClassDefFoundError: sampleBean (wrong nam
e: bean/sampleBean)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:539)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
3)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
是何原因
编译后的.classes文件放在Tomcat\webapps\myjsp\WEB-INF\classes下 没能成功允许对应的.jsp文件