Trying to make delete work.

[amyng]

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Scanner;


public class ExternalSort
{
	static int Y = calculateFileLength(); // size of the file in disk
	static int X = 10; // max items the memory buffer can hold

	public static void externalSort(String fileName)
	{
		String tf = "temperaryfile";
		int[] buffer = new int[X < Y ? X : Y];
		try
		{
			FileReader fr = new FileReader(fileName);
			BufferedReader br = new BufferedReader(fr);
			int slices = (int) Math.ceil((double) Y/X);

			int i, j;
			i = j = 0;
			// Iterate through the elements in the file
			for (i = 0; i < slices; i++)
			{
				// Read M-element chunk at a time from the file
				for (j = 0; j < (X < Y ? X : Y); j++)
				{
					String t = br.readLine();
					if (t != null)
						buffer[j] = Integer.parseInt(t);
					else
						break;
				}
				// Sort X elements
				Arrays.sort(buffer);


				// Write the sorted numbers to temp file
				FileWriter fw = new FileWriter(tf + Integer.toString(i) + ".txt");
				PrintWriter pw = new PrintWriter(fw);
				for (int k = 0; k < j; k++)
					pw.println(buffer[k]);

				pw.close();
				//pw.delete();
				fw.close();
			}

			br.close();
			fr.close();

			// Now open each file and merge them, then write back to disk
			int[] topNums = new int[slices];
			BufferedReader[] brs = new BufferedReader[slices];

			for (i = 0; i < slices; i++)
			{
				brs[i] = new BufferedReader(new FileReader(tf + Integer.toString(i) + ".txt"));
				String t = brs[i].readLine();
				if (t != null)
					topNums[i] = Integer.parseInt(t);
				else
					topNums[i] = Integer.MAX_VALUE;
			}
			
			
			FileWriter fw = new FileWriter("sorted.txt");
			PrintWriter pw = new PrintWriter(fw);
			
			for (i = 0; i < slices; i++)
			{
			    String file = tf + Integer.toString(i) + ".txt";
			    // A File object to represent the filename
			    File f = new File(file);
			
			    // Make sure the file or directory exists and isn't write protected
			    if (!f.exists())
			      throw new IllegalArgumentException(
			          "Delete: no such file or directory: " + file);
			
			    if (!f.canWrite())
			      throw new IllegalArgumentException("Delete: write protected: "
			          + file);
			
			    // If it is a directory, make sure it is empty
			    if (f.isDirectory()) 
				 {
			      String[] files = f.list();
			      if (files.length > 0)
			        throw new IllegalArgumentException(
			            "Delete: directory not empty: " + file);
			    }
			
			    // Attempt to delete it
			    boolean success = f.delete();
			
			  //  if (!success)
			   //   throw new IllegalArgumentException("Delete: deletion failed");
		  }

			for (i = 0; i < Y; i++)
			{
				int min = topNums[0];
				int minFile = 0;

				for (j = 0; j < slices; j++)
				{
					if (min > topNums[j])
					{
						min = topNums[j];
						minFile = j;
					}
				}

				pw.println(min);
				String t = brs[minFile].readLine();
				if (t != null)
					topNums[minFile] = Integer.parseInt(t);
				else
					topNums[minFile] = Integer.MAX_VALUE;

			}
			for (i = 0; i < slices; i++)
				brs[i].close();

			pw.close();
			fw.close();
			

		}
		catch (FileNotFoundException e)
		{
			e.printStackTrace();
		} catch (IOException e) 
		{
			e.printStackTrace();
		}
		

	}
        
	public static void main(String[] args)
	{
		String fileName = "integers.txt";
		externalSort(fileName);
	}
	
		
	public static int calculateFileLength()
	{
		int count = 0;
		String filename = "integers.txt";
		Scanner inputStream = null;
		try
		{
			inputStream = new Scanner( new File(filename));
		}
		catch(FileNotFoundException e)
		{
			System.out.println("Error openning the file" + filename);
			System.exit(0);
		}
		while(inputStream.hasNextLine())
		{
			inputStream.nextLine();
			count++;
		}
		inputStream.close();
		return count;
	}
}

The delete part is not working. It supposes to delete all the temporary file that was created to sort numbers. Can you help me fix it ?

Thank you.

The file integers.txt includes:

120
12
7483
72
47
9
5385
83
75
621
947
273
946
725
745
7341
88
5
825
7


Note: I just want to delete the temporaryfile (text file).

[Fubarable]

Duplicate of a previous post. Closing.