Question

Lab Description :

Exercise :

a) Create an interface named ReadAndWriteFile, that has readAndReturnFile() and writeFile() methods.

b) readAndReturnFile() and writeFile() both throws IOException, FileNotFoundException and Exception.

c) Create a class named DealingWithTextFile that implements ReadAndWriteFile. This class read and write txt files.

d) Create a class named DealingWithCsvFile that implements ReadAndWriteFile.

This class read and write csv files. - Please mention that you have to deal with exceptions, use a dialog message to catch the exceptions.

e) DealingWithTextFile class uses readAndReturnFile() method to read a text file in a. a text file in a specific path "src/R/test.txt" and return ArrayList with the content of the txt file.

. f) DealingWithTextFile class uses writeFile() method to write "test.txt" on a new txt file called "test2.txt".

Your original text file ("test.txt") should be something like:

Name Age Specialized

Ahmad 44 Java

Ali 31 Python

Khaild 90 C++

g) The new text file ("test2.txt") should be :

Name|Age|Specialized

Ahmad|44|Java

Ali|31|Python

Khaild|90|C++

h) DealingWithCsvFile class uses readAndReturnFile() method read csv file a specific path
- Your original text file ("test.txt") should be something like:
"src/R/test.csv".

- The "test.csv" file contains the same data saved in "test.txt", but in csv format.
- Hint: replace empty spaces with commas.

i)DealingWithCsvFile class uses writeFile() method to write "test.csv" file into into a new csv file called "test2.csv".

Answer 1

Find all file below

ReadAndWriteFile.java

import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;

public interface ReadAndWriteFile {
   ArrayList<String> readAndReturnFile() throws IOException,FileNotFoundException,Exception;
   void writeFile() throws IOException,FileNotFoundException,Exception;

}
--------------------------------------------

DealingWithTextFile.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;

public class DealingWithTextFile implements ReadAndWriteFile{
  
   @Override
   public ArrayList<String> readAndReturnFile(){
       ArrayList<String> content=new ArrayList<String>();
       try {
           File file=new File("src/R/test.txt");
           BufferedReader br=new BufferedReader(new FileReader(file));
           String str=null;
           while((str=br.readLine())!=null) {
               content.add(str);
           }
       }
       catch (FileNotFoundException fileNotFound) {
           System.out.println("File not found");
       }
       catch(IOException ioException) {
           System.out.println("IO exception");
       }
       catch (Exception e) {
           System.out.println("some exception occured");
       }
       return content;
   }

   @Override
   public void writeFile() {
       try {
           ArrayList<String> data=readAndReturnFile();
           File file=new File("src/R/test2.txt");
           file.createNewFile();
           BufferedWriter bw=new BufferedWriter(new FileWriter(file));
           for(int i=0;i<data.size();i++) {
               String[] words=data.get(i).trim().split(" ");
               String line="";
               int j=0;
               for(j=0;j<words.length-1;j++) {
                   line+=words[j];
                   line+="|";
               }
               line+=words[j];
               line+='\n';
               bw.write(line);
           }
           bw.close();
       }
       catch (FileNotFoundException fileNotFound) {
           System.out.println("File not found");
       }
       catch(IOException ioException) {
           System.out.println("IO exception");
       }
       catch (Exception e) {
           System.out.println("some exception occured");
       }
       finally {
          
       }
   }
---------------------------------------------------------------------------

DealingWithCsvFile.java

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;

public class DealingWithCsvFile implements ReadAndWriteFile{

   @Override
   public ArrayList<String> readAndReturnFile(){
       ArrayList<String> content=new ArrayList<String>();
       try {
           File file=new File("src/R/test.csv");
           BufferedReader br=new BufferedReader(new FileReader(file));
           String str=null;
           while((str=br.readLine())!=null) {
               content.add(str);
           }
       }
       catch (FileNotFoundException fileNotFound) {
           System.out.println("File not found");
       }
       catch(IOException ioException) {
           System.out.println("IO exception");
       }
       catch (Exception e) {
           System.out.println("some exception occured");
       }
       return content;
   }

   @Override
   public void writeFile(){
       try {
           ArrayList<String> data=readAndReturnFile();
           File file=new File("src/R/test2.csv");
           file.createNewFile();
           BufferedWriter bw=new BufferedWriter(new FileWriter(file));
           for(int i=0;i<data.size();i++) {
               bw.write(data.get(i)+"\n");
           }
           bw.close();
       }
       catch (FileNotFoundException fileNotFound) {
           System.out.println("File not found");
       }
       catch(IOException ioException) {
           System.out.println("IO exception");
       }
       catch (Exception e) {
           System.out.println("some exception occured");
       }
      
   }

}

-----------------

Main.java

import java.util.ArrayList;

public class Main {

   public static void main(String[] args) {
       DealingWithTextFile txt=new DealingWithTextFile();
       ArrayList<String> list=txt.readAndReturnFile();
       list.forEach(System.out::println);
       txt.writeFile();
       DealingWithCsvFile csv=new DealingWithCsvFile();
       ArrayList<String> list2=csv.readAndReturnFile();
       list2.forEach(System.out::println);
       csv.writeFile();
   }

}
-------------------------------

place test.csv and test.txt in R folder as shown in below screenshot