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Write a java program to read input from a file and sort the words and then the whole file again.

This code reads only the 1st line of the input text file and produces the o/p for that line only, the lines that are present in the next sentences(\n) are not executed.

I tried to solve this by carriage return and new line, but it was still in vain.

Please suggest me a proper solution to solve this problem..

code:

import java.io.BufferedReader;
import java.io.FileReader;
import java.util.*;

public class Sorting
{
public static void main(String[] args)throws Exception
    {
        long st=System.currentTimeMillis();
        int v=0;
        List ls=new ArrayList();
        //To read data from file
        BufferedReader in=new BufferedReader(new FileReader("D:/hari1.txt"));
        while((line = in.readLine().toLowerCase()) != null)
        {
          String[] sp=read.replaceAll("[-+.^:,!@#$%&*()~?]"," ").split(" ");
        }
        for(int i=0;i<sp.length;i++)
        {
            //Check for the array if it matches number
            if(sp[i].matches("(\\d+)"))
                //Adding the numbers
                v+=Integer.parseInt(sp[i]);
            else
            {
                //sorting the characters
                char[] c=sp[i].toCharArray();
                Arrays.sort(c);
                String r=new String(c);
                //Adding the resulting word into list
                ls.add(r);
            }
        }
        //Sorting the resulting words in ascending order
        Collections.sort(ls);
        //Appending the number in the end of the list
        ls.add(v);
        //Displaying the string using Iteartor
        Iterator it=ls.iterator();
        while(it.hasNext())
            System.out.print(it.next()+" ");
        long time=System.currentTimeMillis()-st;
        System.out.println("\n Time Taken:"+time);
    }
}
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3  
Walk through your code. How many times do you call readLine? – Devon_C_Miller Oct 28 '12 at 1:20
i did in this way, but i got a error, can you please rectify the mistake in this – Hari Priya R Oct 28 '12 at 9:50
while((line = in.readLine()) != null) { String[] sp=read.replaceAll("[-+.^:,!@#$%&*()~?]","").split(" "); } – Hari Priya R Oct 28 '12 at 9:51
can you please alter this coding in the same program of mine... i am getting some errors in my looping of readline() – Hari Priya R Oct 28 '12 at 10:08
i have edited the program in my post, but still there r errors in the code for split and the following codes.. – Hari Priya R Oct 28 '12 at 10:42
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closed as too localized by Brian Roach, Bohemian, SimpleCoder, DNA, user714965 Oct 28 '12 at 18:13

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1 Answer

up vote 0 down vote

You only have one call to readLine(), therefore you only read the first line!

To read the whole file, you have to call readLine() in a loop until there are no more lines left. You can find many examples of this online, e.g.:

String line;
BufferedReader in = new BufferedReader(new FileReader("input.txt"));
while((line = in.readLine()) != null) {
    // process the line
}
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can you please say me how to code readline() in a loop, based on what ? – Hari Priya R Oct 28 '12 at 2:29
thank you very much .. – Hari Priya R Oct 28 '12 at 9:08
if i place the readline() in a loop, should i make the split based on \n also ? bcz it shows an error in dis line of the code – Hari Priya R Oct 28 '12 at 9:44
'while((line = in.readLine()) != null) { String[] sp=read.replaceAll("[-+.^:,!@#$%&*()~?]"," ").split(" "); }' – Hari Priya R Oct 28 '12 at 9:53
can you please alter this coding in the same program of mine... i am getting some errors in my looping of readline() – Hari Priya R Oct 28 '12 at 10:04
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