Question

Write a program in Java that reads the file and does two things:

Write to an output file called

dataSwitch.txt

the same data from the input file, but switch the

order of the data entries on each line. For example, if the first line of the input file is

“90001 57110”, the first line of the output file would be “57110 90001”.

Additionally, print to the screen the number of lines in the file with a label

Answer 1

/*
 *  Java Program for data switch
 */

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

public class Main {

  public static void main(String args[]) {
    try {
      Scanner inFile = new Scanner(new File("in.txt"));
      FileWriter outFile = new FileWriter("out.txt");
      int countLines = 0;
      
      while (inFile.hasNextLine()) {
        int first = inFile.nextInt();
        int last = inFile.nextInt();
        outFile.write(Integer.toString(last) + " " + Integer.toString(first) + "\n");
        countLines++;
      }
      
      System.out.println("Number of lines in a file: " + countLines);

      inFile.close();
      outFile.close();
    }
    catch (FileNotFoundException e) {
      System.err.println("File not found. Please scan in new file.");
    }
    catch (IOException e) {
      System.out.println("IO Error occurred.");
      e.printStackTrace();
    }
  }
}

'D OO https://AggravatingCheapTrials.imtusharsharma.repl.run Files D Main.java in.txt Main.java 3 saved 1 /* 2 * Java Program for data switch 3 */ OpenJDK Runtime Environment (build 10.0.2+13-Ubuntu-lubuntu0.18.04.4) 2 javac -classpath .:/run dir/junit-4.12.jar -d . Main.java 2 java -classpath .:/run dir/junit-4.12. jar Main Number of lines in a file: 3 Main.class import java.io.*; import java.util.*: B out.txt public class Main { public static void main(String args[]) { try { Scanner inFile = new Scanner(new File("in.txt")); Filewriter outFile = new FileWriter("out.txt"); int countLines = 0; while (infile.hasNextLine() { int first = inFile.nextInt(); int last = inFile.nextInt(); outFile.write(Integer.tostring(last) + " " + Integer.tostring (first) + "\n"); countLines++; System.out.println("Number of lines in a file: " + countLines); infile.close(); outfile.close(); catch (FileNotFoundException e) { System.err.println("File not found. Please scan in new file.");