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This exception has no message.
java.lang.NullPointerException: 	at undefined.Calculator$Func.(	at undefined.Calculator.(	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(	at java.lang.reflect.Constructor.newInstance(	at java.lang.Class.newInstance0(	at java.lang.Class.newInstance(	at sun.applet.AppletPanel.createApplet(	at sun.applet.AppletPanel.runLoader(	at	at