Problem : How you can make copy of a text file?

Contents

1. 1 Program :
   1. 1.1 Step 1 - Coding
   2. 1.2 Step 2 - Deployment
   3. 1.3 Step 3 - Testing
   4. 1.4 Output

Solution : java.io.FileReader  will be used to read data from source text file and java.io.FileWriter will be used to write data to target text file.

Program :

Step 1 - Coding

Create a text file c:sunilos/CopyFile.java and copy below contents.

import java.io.FileReader;
import java.io.FileWriter;

import com.sun.corba.se.impl.ior.WireObjectKeyTemplate;

/**
 * A program to copy from one file to another file.
 */
public class CopyFile {

    public static void main(String[] args) throws Exception{
        String source = "c:/sunilos/sunilos.txt";
        String target = "c:/sunilos/sunilos-copy.txt";

        //File writer takes chars and convert into bytes and write to a file
        FileReader reader = new FileReader(source);

                 // PrintWriter takes lines and convert that into charters and gives to FileWriter 
        FileWriter writer = new FileWriter(target);
       
        int ch = reader.read();
        while(ch!=-1){
            writer.write(ch);
            ch= reader.read();
        }
        writer.close();
        reader.close();
        System.out.println(source + " is copied to " + target);
    }

}

Step 2 - Deployment

1. Create a folder 'c:\sunilos'. 
2. Create or copy CopyFile.java  into 'c:\sunilos' folder.
3. It is assumed that your hard drive has c:/sunilos/sunilos.txt file.
4. Open your command prompt and go to  'c:\sunilos'
   
5. Compile CopyFile.java with help of 
• javac CopyFile.java command.  Command will create CopyFile.class file in 'c:/sunilos/com/sunilos/io/' folder.
  
6. Congratulations!! your Java program is ready to serve.

Step 3 - Testing

1. Make sure you are on Command Prompt under c:\sunilos directory
   
2. Now start your java program from command prompt with help of 
• java CopyFile command.
3. Now to check your data open
   
• c:/sunilos/sunilos-copy.txt
  

Output

C:\sunilos>java -cp . com.sunilos.io.CopyFile
c:/sunilos/sunilos.txt is copied to c:/sunilos/sunilos-copy.txt


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