Writing Files 3 2 2011 Opening Discussion Minute essay comments Why are Mondays so awful Why use an Iterator if it gets consumed after one use Starting to see the power of Scala Solutions to the interclass problem java util Scanner Java Scanner class sometimes easier for input hasNext next hasNextInt nextInt hasNextDouble nextDouble Doesn t produce a Scala collection Needs java io File new Scanner new File fileName Always make a new object from the Java libraries using new Scala typically allows you to leave that off Closing Files Make sure you always close files when you are done using them Source Scanner and pretty much anything else that pulls from a file will have a close method java io PrintWriter To write to files use java io PrintWriter Create with new PrintWriter fileName Has print and println methods just like what you have been using to print to screen Flush To make certain contents have been written to the file use flush Doing close will also flush and you should definitely remember to close all files you are writing when done with them Command Line Arguments In a script the command line arguments are put in args Array String You can do anything with them that you would do with a normal array Examples Print some random numbers to a file A file copy with word replace Minute Essay Have any questions What can I do that would help you with the material Are you reading and trying to do exercises and other things from the book
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