A.NullpointerException B.ArithmeticExceptioin C.ArrayIndexOutOfBoundsException D.SecurityManager
A.button.enableActionEvents(); B.button.addActionListener(anActionListener); C.button.enableEvents(true); D.button.enableEvents(AWTEvent.ACTION_EVENT_MASK);
A.float f=1/3; B.int i=1/3; C.float f=1.01; D.double d=999d;