The java.lang.Number and its subclasses are introduced in Chapter ...

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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;

◦ The program runs fine, since Integer is a subclass of Double.
◦ You can convert an int to double, so you can cast an Integer instance to a Double instance.
◦ The compiler detects that numberRef is not an instance of Double.
◦ A runtime class casting exception occurs, since numberRef is not an instance of Double.
◦ There is no such class named Integer. You should use the class Int.

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