JAVA 反射机制工厂模式 报错一直找不出原因 小白一枚 求老哥解答

Question

java.lang.ClassNotFoundException: JavaBook
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.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at demo6.Factory2.getInstance(TestFactory.java:29)
at demo6.TestFactory.main(TestFactory.java:40)
Exception in thread "main" java.lang.NullPointerException
at demo6.TestFactory.main(TestFactory.java:41)