Author Question: The java.lang.Number and its subclasses are introduced in Chapter 11. Analyze the following code. ... (Read 65 times)

Pineapplelove6 · **on:** May 6, 2020

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.

itsakadoozi · **Reply #1 on:** May 6, 2020

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