What expression can I use here?

I'm a novice in Java and started reading a book by Walter Savitch for Java, and it's a great book. But he's used his own method for reading an input. For example he's used the following line to be inputted by the user:
temperature[index] = SavitchIn.readLineDouble();
Now, how can I change the above line so that instead of SavitchIn.readLineDouble() it is something that normal compilers can read? Because this can only be read by the compiler given from his book.
Thank you.
Funky

Why don't you take a look at the source code of that mysterious SavitchIn class and find out what the method readLineDouble() does?

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Sami\'s mom wrote:
I need to reprogram the delete and enter key to the left side of a external keyboard for the ipad mini.
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