method_name
method is void, null
is returned.method_name
method returns a primitive type, then return wrapper class instance.
@throws InvocationTargetException when the invoked method throws an exception.
@throws NoSuchMethodException when the method cannot be found.
@throws IllegalAccessException when access to the class or method is lacking.
@throws SecurityException if access to the package or method is denied.
@exception IllegalAccessException
@exception NoSuchMethodException
@exception InvocationTargetException
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