Programming Questions

Question

Hello, I'm new to Java programs, but I was wondering if anyone would know how, i could write a program that would essentially do the following:
-ask for input
-the java program would open copy of a document and change a line in that document to the input
-save the document
-excecute program that would run and use input as parameter for calculation
-once the program is done, user would be notifyed
-number retrieved from output document
-number would be saved
-then program woul automatically select its own input number, and then keep extracting numbers from output document, until it could find the smallest number.
(I dont want someone to write me the program, but I would like to know what kind of methods and techniques would have to be used to accomplish this, and where I might go to learn how to do this, and how difficult it will be.)

Answer 1

lambern wrote:
Hello, I'm new to Java programs, but I was wondering if anyone would know how, i could write a program that would essentially do the following:I don't know how you would write it, but I know how I would write it :)
-ask for inputsee Scanner class.
Scanner in = new Scanner(System.in);
-the java program would open copy of a document and change a line in that document to the inputuse FileInputStream, Scanner, PrintWriter, FileOutputStream, File
-save the documentmyFileOutputStream.close()
-excecute program that would run and use input as parameter for calculationProcessBuilder, Process if you have a seperate program already existing to call
-once the program is done, user would be notifyedSystem.out.println("program is done\n");
-number retrieved from output documentFile f = new File("outFilename");
FileInputStream in = new FileInputStream(f);
Scanner inScan = new Scanner(in);
int num = inScan.nextInt();
-number would be savedok, now save that number...
-then program woul automatically select its own input number, and then keep extracting numbers from output document, until it could find the smallest number.I don't know what you mean by that...
>
(I dont want someone to write me the program, but I would like to know what kind of methods and techniques would have to be used to accomplish this, and where I might go to learn how to do this, and how difficult it will be.)It will be pretty easy once you figure out how to read and write files. go here for more:
http://java.sun.com/docs/books/tutorial/essential/io/fileio.html