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  1. #1
    Join Date
    Sep 2005
    Posts
    74

    Files

    Here is my code:

    Code:
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    import java.io.*;
    import java.text.NumberFormat;
    
    public class FileStats extends JFrame
    {
    	public static JTextArea display;
    	
    	public FileStats()
    	{
    		super("Testing FileStats program");
    		display = new JTextArea();
    		getContentPane().add(display, "Center");
    		
    	}// FileStats()
    	
    	/* pre: args has command-line arguments
    	 * post: both files in args have been closed;
    	 *       max, min, count, sum have been calculated
    	 * calls: doStats
    	 */
    	public static void readFile(String[] args) throws IOException
    	{
    		// Get file name arguments from the command line as entered by the user
    		String inFileName = args[0];
    		String outFileName = args[1];
    		
    		try
    		{
    			// Prepare files
    			BufferedReader inFile = new BufferedReader(new FileReader(inFileName));
    			PrintWriter outFile = new PrintWriter(new FileWriter(outFileName));
    			
    			// Read and write from input and output files
    			String testInfo = inFile.readLine();
    			outFile.println("Results " + testInfo);
    			outFile.println();
    			
    			String num = inFile.readLine();
    			
    			while (num != null)
    			{
    				doStats(num, inFile, outFile);
    				num = inFile.readLine();
    			}// while()
    
    			// Close the files
    			inFile.close();
    			outFile.close();
    			
    		} catch (FileNotFoundException e){
    			display.setText("IOERROR: File NOT Found " + inFileName + "\n");
    			e.printStackTrace();
    		} catch (IOException e){
    			display.setText("IOERROR: " + e.getMessage() + "\n");
    			e.printStackTrace();
    		}// end try/catch block
    		
    		display.append("Program completed.  Close window to exit program.\n");
    		
    	}// readFile()
    	
    	 /* pre: num has a value
    	  * post: max, min, count, sum have been set or reset
    	  */
    	public static void doStats(String num, BufferedReader inFile,
                PrintWriter outFile) throws IOException
    	{
    		int number;
    		int count = 0;
    		int sum = 0;
    		int countOfNums = 0;
    		int max = 0;
    		int min = 0;
    		
    		while (count != 14)
    		{
    			number = Integer.parseInt(inFile.readLine());
    			sum += number;
    			countOfNums++;
    			if (max > number)
    			{
    				max = number;
    			} else {
    				max = 0;
    			}// if()
    			if (min < number)
    			{
    				min = number;
    			} else {
    				min = 0;
    			}// if()
    			
    			count++;
    		}// while()
    		
    		outFile.println("sum " + sum);
    		display.append("sum" + sum + "\n");
    		outFile.println("count " + countOfNums);
    		display.append("count" + countOfNums + "\n");
    		outFile.println("max " + max);
    		display.append("max" + max + "\n");
    		outFile.println("min " + min);
    		display.append("min" + min + "\n");
    		
    	}// doStats()
    	
    	public static void main(String[] args) throws IOException
    	{
    		FileStats fileStat = new FileStats();
    		readFile(args);
    		fileStat.setSize(400, 300);
    		fileStat.setVisible(true);
    		fileStat.addWindowListener(new WindowAdapter() {
    
                public void windowClosing(WindowEvent e){
    
                      System.exit(0);
    
                }
    
          });
    	}// main()
    }// FileStats
    For some reason I'm getting an ArrayIndexOutOfBoundsException. I have a file called numbers.dat with a 13 numbers in it, and I'm trying to read from it, preform operations on the numbers, and output the results to both the JFrame and a new file. Can someone shed some light on what I'm doing wrong?
    Last edited by Dark Rain; 01-21-2006 at 01:28 PM.

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