/*
 * Random data file
 */
package randomfile;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;
import java.util.Scanner;

/**
 *
 * @author jcmtiernan
 */
public class RandomFile
{
    public static void main(String[] args) throws IOException
    {
        final int COUNT_MAX = 100;
        final int RANGE_MAX = 1000;        
        
        Scanner input = new Scanner(System.in);
        String dataFile = "matchdata1.dat";
        
        File file = new File(dataFile);
        file = makeRandomPairFile(file, COUNT_MAX, RANGE_MAX);     // creates test data file
        Scanner inputFile = new Scanner(file);  

        System.out.println("Looping on COUNT_MAX, the data in the file is: ");
        for( int i = 0; i < COUNT_MAX; i++)
        {
            System.out.printf("%6d",inputFile.nextInt());
            if ((i % 10)== 9)
            {
                System.out.printf("\n");
            }
        }
        System.out.println("The data in the file was COUNT_MAX pairs so the loop only printed half. ");        
                
        Scanner inputFile2 = new Scanner(file);  
        System.out.println();        
        System.out.println();
        int i = 0;
        System.out.println("Checking for whether there is more data, then all the data in the file is: ");
        while( inputFile2.hasNextInt())
        {
            System.out.printf("%6d",inputFile2.nextInt());
            if ((i++ % 10)== 9)
            {
                System.out.printf("\n");
            }            
        }        
    }
    
  
    public static File makeRandomPairFile(File file, int max, int range) throws IOException
    {
        FileWriter fw = new FileWriter(file.getAbsoluteFile());
        BufferedWriter bw = new BufferedWriter(fw);
        int rand1, rand2;      
        Random randGen = new Random(); //creating Random number generator  
        
        for(int k = 0; k < max; k++)
        {
            rand1 = randGen.nextInt(range); // notice that two values are being printed
            rand2 = randGen.nextInt(range);         
            bw.write(String.format("%8d%8d", rand1,rand2));
                bw.newLine();
        }
        
        bw.close();// be sure to close BufferedWriter                
        
        return file;
    }
    
}