Reading and writing to a file

For this assignment just read a file and write to that same file and add the number 1 to each word, not numerically string wise. Punctuation doesn't matter. It works sort of, however when I run it to a text file it just makes the txt file blank. Any ideas? Thanks, oh and I can't change echo at all! I have 3 classes, writerDriver(main), echo, and writer. They are in order respectively.

Code:

---

import java.util.Scanner;
import java.io.*;
public class WriterDriver {

    /**
    * @param args the command line arguments
    */
    public static void main(String[] args) throws IOException {
        String fileName;
      Scanner nameReader = new Scanner(System.in);
      System.out.println("Enter a file name");
    fileName = nameReader.nextLine();
    Scanner scan = new Scanner(new FileReader(fileName));
    Writer d = new Writer(fileName);
    d.readLines();

    scan.close();
    }

}

---

Code:

---

import java.util.Scanner;
  import java.io.*;

  public class Echo{
    String fileName; // external file name
    Scanner scan; // Scanner object for reading from external file

    public Echo(String f) throws IOException
    {
    fileName = f;
    scan = new Scanner(new FileReader(fileName));
  }

  public void readLines(){ // reads lines, hands each to processLine
    while(scan.hasNext()){
      processLine(scan.nextLine());
    }
    scan.close();
  }

  public void processLine(String line){ // does the real processing work
    System.out.println(line);
  }
 }

---

Code:

---

import java.util.Scanner;
  import java.io.*;
import java.util.StringTokenizer;
public class Writer extends Echo {
    PrintWriter writer = new PrintWriter(fileName);
    public Writer(String f) throws IOException {
    super(f);
}


    public void readLines(){ // reads lines, hands each to processLine
    super.readLines();
    scan.close();

  }

    public void processLine(String line){ // does the real processing work
    StringTokenizer st = new StringTokenizer(line);
    while (st.hasMoreTokens()) {
        writer.print(st.nextToken+"1");
        writer.println("");
       
    }

 writer.close();
  }




}

---

And your question is?

When I write to a file, like say C:\test.txt and inthere was "testing this thing" It should go to "testing1 this1 thing1" but instead I just get a blank text document,

Oh also to help anyone, the error probably lies in the writer class.

Code:

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writer.print(st.nextToken+"1");

---

This is not going to compile, because the syntax is incorrect. Is that the problem you're having?

Well, since it's a PrintWriter, it's correct.

You're real problem is that you are attempting to read and write, to the same file. Well, when you open an outputstream to a file it overwrites the original file, so your reader has nothing to read.

You need to write to a new file, then delete the original and rename the new one to the old name.

Okay if I wanted to write to a new file how would I go about doing that? I am a bit confused now, also it's okay if the new file is in the same directory.

I tried doing this

Code:

---

public class Writer extends Echo {
    PrintWriter writer = new PrintWriter("anything.txt");
    public Writer(String f) throws IOException {
    super(f);
}

---

But it doesn't do anything I thought it would create anew txt file called anything.txt? Anyone got any suggestions?

And it should. Are you looking in the right place?

Add a

Code:

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System.out.println(System.getProperty("user.dir"))

---

right before that "new PrintWriter" statement to find out where that file is being created.

Edit: Actually, since that statement is part of the class definition, you can't add that statement before, so add that statement as part of your constructor.

OOoh thanks for that tip
C:\Users\JigglyWiggly\Documents\NetBeansProjects\W riterDriver

It put the output there but still there is nothing in that file??? This is driving me insane lol.

Wait wait it worked! haha you are the best

Ehh one problem only the first line gets sent? like if I have a text file that goes like

hello i jacked your wallet
sorry bout that

It would become hello1 i1 jacked1 your1 wallet1

The second line does not go through? Any ideas?

Because you are closing the writer after writing the first line. Remove the writer.close from processLine and put it at the end of readLines.

Okay you are a life saver and I also added a [code]writer.println(""); after processline to account for new lines. You guys are awesome, seriously. It all works wooohooo.
Final code:

Code:

---

import java.util.Scanner;
import java.io.*;
public class WriterDriver {

    /**
    * @param args the command line arguments
    */
    public static void main(String[] args) throws IOException {
        String fileName;
      Scanner nameReader = new Scanner(System.in);
      System.out.println("Enter a file name");
    fileName = nameReader.nextLine();
    Scanner scan = new Scanner(new FileReader(fileName));
    Writer d = new Writer(fileName);
    d.readLines();

    scan.close();
    }

}

---

Code:

---

import java.util.Scanner;
  import java.io.*;

  public class Echo{
    String fileName; // external file name
    Scanner scan; // Scanner object for reading from external file

    public Echo(String f) throws IOException
    {
    fileName = f;
    scan = new Scanner(new FileReader(fileName));
  }

  public void readLines(){ // reads lines, hands each to processLine
    while(scan.hasNext()){
      processLine(scan.nextLine());
    }
    scan.close();
  }

  public void processLine(String line){ // does the real processing work
    System.out.println(line);
  }
 }

---

Code:

---

import java.util.Scanner;
  import java.io.*;
import java.util.StringTokenizer;
public class Writer extends Echo {
   
    PrintWriter writer = new PrintWriter("something.txt");

    public Writer(String f) throws IOException {
      super(f);
      System.out.println(System.getProperty("user.dir"));
}


    public void readLines(){ // reads lines, hands each to processLine
    super.readLines();
    scan.close();
writer.close();
  }

    public void processLine(String line){ // does the real processing work
    StringTokenizer st = new StringTokenizer(line);
    while (st.hasMoreTokens()) {
        writer.print(st.nextToken()+"1");
        writer.print(" ");
       
       
       
    }
writer.println("");
 
  }




}

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