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In Java, like in almost any computer programming language, reading data from a file can be tricky. You add extra lines of code to tell the computer what to do. Sometimes you can copy and paste these lines from other peoples’ code.

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For example, you can follow the pattern in this listing:

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You want to read data from a file. You start by imagining that you’re reading from the keyboard. Put the usual Scanner and next codes into your program. Then add some extra items from the listing pattern:

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  • Add two new import declarations — one for java.io.File and another for java.io.IOException.

  • Type throws IOException in your method’s header.

  • Type new File(“) in your call to new Scanner.

  • Take a file that’s already on your hard drive. Type that filename inside the quotation marks.

  • Take the word that you use for the name of your scanner. Reuse that word in calls to next, nextInt, nextDouble, and so on.

  • Take the word that you use for the name of your scanner. Reuse that word in a call to close.


Occasionally, copying and pasting code can get you into trouble. Maybe you’re writing a program that doesn’t fit the simple listing pattern. You need to tweak the pattern a bit. But to tweak the pattern, you need to understand some of the ideas behind the pattern.