The java.lang.Number and its subclasses are introduced in Chapter 11. Analyze the following code.
Number numberRef = new Integer(0);
Double doubleRef = (Double)numberRef;
a. There is no such class named Integer. You should use the class Int.
b. The compiler detects that numberRef is not an instance of Double.
c. A runtime class casting exception occurs, since numberRef is not an instance of Double.
d. The program runs fine, since Integer is a subclass of Double.
e. You can convert an int to double, so you can cast an Integer instance to a Double instance.
c. A runtime class casting exception occurs, since numberRef is not an instance of Double.
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a. Only the + operator needs to be overloaded. b. Only the = operator needs to be overloaded. c. Both the + and = operators need to be overloaded. d. The += operator cannot be overloaded implicitly.
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Indicate whether the statement is true or false
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A. The Delete command is not visible. B. The Delete command has a line through it. C. The Delete command is grayed out. D. There is no way to tell if records cannot be deleted.