Java

Merging two files [editted]

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Join Date: Dec 2008

Posts: 65

Reputation: StarZ is an unknown quantity at this point

Solved Threads: 1

StarZ

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Merging two files [editted]

Nov 4th, 2009

I'm supposed to merge a ordered data of two files into a third file, keeping the data in order. I'm suppose to create a MergeFiles application that merges the integers ordered from low to high in two files into a third file, keeping the order from low to high. Then should merge the two files by taking one element at a time from each, and the third file should contain the numbers from both file from lowest to highest. so, i saved the numbers in wordpad as data1.txt, and data2.txt.

Data1: 11 25 36 45 56 78 90
Data2: 1 3 5 7 54 32 78 99

Then the third data should output:

data3: 1 3 5 7 11 25 32 36 45 54 56 ..... so on (from low to high)

So far I have this:
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
public class Main {
 
 
    public static void main(String[] args) {
    FileReader file1=new FileReader("Data1.txt");
    Scanner scan = new Scanner(new File("Data1.txt"));
    ArrayList<Integer> values = new ArrayList<Integer>();
    collections.sort(values); 
 
    while(scan.hasNextInt()) values.add(scan.nextInt());  
 
    FileReader file2=new FileReader("Data2.txt");
    Scanner scan = new Scanner(new File("Data2.txt"));
    ArrayList<Integer> values = new ArrayList<Integer>();
    collections.sot(values); 
 
    while(scan.hasNextInt()) values.add(scan.nextInt());         
 
        BufferedReader br1 = new BufferedReader (file1);
        BufferedReader br2 = new BufferedReader (file2);
 
        String temp1, temp2;
        while(br1.readLine() !=null)
        {
        temp1=br1.readLine()+temp1;
        }
        while(br2.readLine()!=null)
        {
        temp2=br2.readLine()+temp2;
        }
        String temp = temp1 + temp2;
        FileWriter fw=new FileWriter("data3.txt");
        char buffer[]=new char[temp.length];
        temp.getChars(0,temp.length(),buffer,0);
        fw.write(buffer);
        file1.close();
        file2.close();
        fw.close();
     }
}
public class Main {

    
    public static void main(String[] args) {
    FileReader file1=new FileReader("Data1.txt");
    Scanner scan = new Scanner(new File("Data1.txt"));
    ArrayList<Integer> values = new ArrayList<Integer>();
    collections.sort(values); 

    while(scan.hasNextInt()) values.add(scan.nextInt());  
    
    FileReader file2=new FileReader("Data2.txt");
    Scanner scan = new Scanner(new File("Data2.txt"));
    ArrayList<Integer> values = new ArrayList<Integer>();
    collections.sot(values); 

    while(scan.hasNextInt()) values.add(scan.nextInt());         
        
        BufferedReader br1 = new BufferedReader (file1);
        BufferedReader br2 = new BufferedReader (file2);
        
        String temp1, temp2;
        while(br1.readLine() !=null)
        {
        temp1=br1.readLine()+temp1;
        }
        while(br2.readLine()!=null)
        {
        temp2=br2.readLine()+temp2;
        }
        String temp = temp1 + temp2;
        FileWriter fw=new FileWriter("data3.txt");
        char buffer[]=new char[temp.length];
        temp.getChars(0,temp.length(),buffer,0);
        fw.write(buffer);
        file1.close();
        file2.close();
        fw.close();
     }
}

I don't know what codes I'm missing... and when i compile there are 13 errors.... I would post the errors here but it's to long.
So if u like just copy and paste this to ur java and test it.

ugh whats wrong with my program ><"

Last edited by StarZ; Nov 4th, 2009 at 11:52 pm.

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Join Date: Sep 2008

Posts: 1,657

Reputation: BestJewSinceJC is a splendid one to behold

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BestJewSinceJC BestJewSinceJC is offline

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Posting Virtuoso

Nov 5th, 2009

http://www.daniweb.com/forums/thread235793.html

You need to mark solved threads as solved - not to do so (and not even a thank you post)? is rude.

 Help with Code Tags 
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collections.sot(values);
collections.sot(values);

There is no sot method. Or collections class. It's Collections.sort(values). . the case is important. And you should only call Collections.sort() after you add all the values from both files to the array. You are sorting after you add the values from one file, which does nothing useful. Then, after you sort, you should print the values out to a file.

edit: And there is no need for the extra array "temp" or anything like that. You should just create an instance of some class that allows you to write out to a file. You should then use that Object to write each element in your array out to a file using a for loop. There are a lot of examples online of writing to a file. . I suggest PrintWriter, as I think I did in the other thread I helped you in.

Last edited by BestJewSinceJC; Nov 5th, 2009 at 2:58 am.

Out.