Thread: Sorting an ArrayList

Hello all,

I am working on a program for school and I am having trouble with sorting my list. The numbers I receive in my output are correct, but not in ascending order as required.

Here is my current code

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package gtt1_task2b;
 
import java.util.Scanner;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.FileReader;
import java.io.File;
import java.io.FileWriter;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
/**
 *
 */
public class GTT1_Task2B{
 
      public static void main(String[] args) throws FileNotFoundException, IOException
    {
     // Prompt for the input and output file names
        Scanner properties = new Scanner(System.in);
        System.out.print("Input file: ");
        String inputFile = properties.next();
     // Create variables
        String id = null ;
        BufferedWriter pwfo = null;
        try{
        pwfo = new BufferedWriter(new FileWriter("C:\\Users\\zubeda.a.hemani\\Documents\\NetBeansProjects\\GTT1_Task2\\src\\gtt1_task2\\overview.txt"));
        } catch (IOException e){    
           }
           PrintWriter pwo = new PrintWriter(pwfo);
        File input = new File(inputFile);
        BufferedReader in = new BufferedReader(new FileReader(input));
        int count = 0;
        double sum = 0;
        //int i = 0;
        //ArrayList<Double> plist = new ArrayList<Double>();
 
  while ((id = in.readLine())!= null)     
            {
            count++;
            String[] proplist = id.split("[\\s}]");
            Double pvalue = Double.parseDouble(proplist[2]);
 
            for (int i=0; i < proplist.length; i++)
           {
                sum+= pvalue;
               }        
            }
            System.out.println("Total properties listed:  " + count);
            System.out.println("Total value of properties listed: " + sum + "\n");
            in.close();
 
            try {
        ArrayList<String> propids = new ArrayList<String>();       
        Scanner idlist = new Scanner((input));
          //print property ids
 
           while (idlist.hasNextLine())
           {               
             id = idlist.nextLine();
             String[] fields =id.split("[\\s}]");
             String pids = (fields [0]);   
                   {     
                    Collections.sort(propids);
                    Iterator j =propids.iterator();
                    System.out.println(pids);
                    for (int i =0; i<6;i++)
                    in.close();
                   }
                }
          //close Print Writer
            pwo.flush();
            pwo.close();
          }catch(Exception e){
                   }
            }
        }

I am not sure where I am going wrong. Any assitance is greatly appreciated.

Thank you.

Thank you for the advice, I will try that.