Y. Daniel Liang, “Introduction to Java Programming”, 10th Edition, Pearson, 2015

Question

Y. Daniel Liang, “Introduction to Java Programming”, 10th Edition, Pearson, 2015 ISBN: 978-0-13-376131-3

USING Java Programming

Write a program that will write the contents of a text file backwards one character at a time. Your program should first ask for the text file name to be processed – and after verifying that the file exists, it should read the file into a StringBuilder buffer. Save the new file using the old filename appended with “Ver2-“ at the front. So for the file “MyStuff.txt” the file would be saved as Ver2-MyStuff.txt”. You can use any text file to test your work

Explanation / Answer

class filewr
{
   public static void main(String args[])
   {
       String str="file.txt";  
       BufferedReader br = new BufferedReader(new FileReader(str));
       try {
           StringBuilder sb = new StringBuilder();
           String line = br.readLine();

           while (line != null) {
           sb.append(line);
           sb.append(System.lineSeparator());
           line = br.readLine();
           }
           String everything = sb.toString();
       } finally {
           br.close();
           }

       String str1="Ver2-"+str;      
       File file = new File(str1);
       try {
       BufferedWriter writer = new BufferedWriter(new FileWriter(file));
       writer.write(sb.toString());
       } finally {
       if (writer != null) writer.close();
       }
   }
}

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