IcedTea.java

import java.util.Scanner;   // for user input
import java.io.*;       // for File handling

public class IcedTea {

    /**
    *   Program:    IcedTea.java
    *   Purpose:    First run: save data.
    *           Subsequent runs: recall data from disk; update; save new data.
    *   Creator:    Chris Clarke
    *   Created:    11.07.2013
    */

    public static void main(String[] args) {

        // where to save your text file
        File tempDir=new File( File.separator+"temp");
        if (!tempDir.exists()) tempDir.mkdir();         // create new directory

        String filename = File.separator+"temp"+File.separator+"IcedTeaTextFile.txt";
        String strTimesMade="";
        int timesMade = 0;

        Scanner scan = new Scanner (System.in);

        System.out.print("Are you running this program for the first time? ");
        String firstTime = scan.nextLine();
        if (firstTime.toLowerCase().startsWith("y")) {
            saveText( filename, strTimesMade);      // create new text file
        } else {
            strTimesMade = readText( filename);     // read text from file
            timesMade = Integer.parseInt(strTimesMade); // convert to int
        }

        System.out.println("Hi! You've made iced tea "+timesMade+" times so far since 05.10.14.");
        System.out.println("Please enter a number to add to the current number\n"
         +"of times you've made iced tea.");
        int number = scan.nextInt();
        timesMade += number;
        System.out.println("Thanks. You've now made iced tea "+timesMade+" times so far since 05.10.14.");

        strTimesMade = "" +timesMade;           // convert to String
        saveText( filename, strTimesMade);      // save new text
        System.out.println("Now run this program again.");
    } // end main()

   public static void saveText(String filename, String text) {
        Writer writer = null;

        try {
            File file = new File(filename);
            writer = new BufferedWriter(new FileWriter(file));
            writer.write(text);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (writer != null) {
                    writer.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    } // end saveText()

    public static String readText(String filename) {
        File file = new File(filename);
        StringBuffer contents = new StringBuffer();
        BufferedReader reader = null;

        try {
            reader = new BufferedReader(new FileReader(file));
            String text = null;

            // repeat until all lines are read
            while ((text = reader.readLine()) != null) {
                contents.append(text);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        // show file contents here
        //System.out.println(contents.toString());

    return contents.toString();

    } // end readText()

} // end IcedTea