file-io - the new data are written into it If file doesn't...

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1 Reading and Writing Text Files Reading Text Files • Simplest way to read text: use Scanner class • To read from a disk file, construct a FileReader • Then, use the FileReader to construct a Scanner object Use Scanner methods to read data from file – next , nextLine , nextInt , and nextDouble FileReader reader = new FileReader("input.txt"); Scanner in = new Scanner(reader); Writing Text Files • To write to a file, construct a PrintWriter object • If file already exists, it is emptied before
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Unformatted text preview: the new data are written into it If file doesn't exist, an empty file is created PrintWriter out = new PrintWriter("output.txt"); Writing Text Files Use print and println to write into a PrintWriter : You must close a file when you are done processing it: Otherwise, not all of the output may be written to the disk file out.println(29.95); out.println(new Rectangle(5, 10, 15, 25)); out.println("Hello, World!"); out.close();...
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This note was uploaded on 06/16/2008 for the course CSIS 2102 taught by Professor Teneja during the Spring '07 term at Stockton.

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