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cheap java application println(fahr + " " + celsius); fahr = fahr + step; } // while loop ends here } // try ends here catch (IOException e) { System.out.println("Error: " + e); System.exit(1); } } // main ends here} There are only three things necessary to write formatted output to a file rather than to the standard output: Open a FileOutputStream using a line like FileOutputStream fout = new FileOutputStream("test.out"); This line initializes the FileOutputStream with the name of the file you want to write into.

cheap java application Convert the FileOutputStream into a PrintStream using a statement like PrintStream myOutput = new PrintStream(fout); The PrintStream is passed the FileOutputStream from step 1. Instead of using System.out.println() use myOutput.println().

cheap java application System.out and myOutput are just different instances of the PrintStream class. To print to a different PrintStream we keep the syntax the same but change the name of the PrintStream. Reading a text fileNow that we know how to write a text file, let's try reading one. The following code implements the Unix cat utility in Java.

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