How to run the following code? It keeps to show "Try running the program again. Provide 3 run-time parameters: 1) data source file path 2) destination file path 3) number of records in the data file." It needs to validate parameter first. How to validate parameter?

import java.io.*;

public class SmallAreaIncomePovertyDataEditor

{

public static void main(String[] args)

{

// checks the number of run-time parameters

if (args.length != 3)

{

System.out.println(" Try running the program again. Provide 3"

+ " run-time parameters: 1) data source file path 2)"

+ " destination file path 3) number of records in the data"

+ " file. ");

return;

}

// checks the correctness of the first run-time parameter

File fIn = new File(args[0]);

if (!fIn.exists() ||

!args[0].endsWith("SmallAreaIncomePovertyEstData.txt"))

{

System.out.println(" Try running the program again. Make sure"

+ " the first run-time parameter contains the correct file "

+ " path to SmallAreaIncomePovertyEstData.txt. ");

return;

}

// checks the correctness of the second run-time parameter

File fOut = new File(args[1]);

if (!fOut.getParentFile().exists() ||

!args[1].endsWith("FormattedReportData.dat"))

{

System.out.println(" Try running the program again. Make sure"

+ " the second run-time parameter contains a correct file "

+ " path for the FormattedReportData.dat file. ");

return;

}

// checks the correctness of the third run-time parameter

int numOfRecs=13486;

try

{

numOfRecs = Integer.parseInt(args[2]);

}

catch (NumberFormatException e)

{

System.out.println(" Try running the program again. The third"

+ " run-time parameter needs to be an integer. ");

return;

}

// initializes the buffered I/O devices

try (BufferedReader br = new BufferedReader(new FileReader(fIn));

BufferedWriter bw = new BufferedWriter(new FileWriter(fOut)))

{

for (int line = 1; line <= numOfRecs; line++)

{ // executes the I/O process line by line

// reads in the current line

String currLine = br.readLine();

// finds and processes relevant data

String stateCode = currLine.substring(0, 2);

String pop = currLine.substring(82, 90).trim();

String childPop = currLine.substring(91, 99).trim();

String childPovPop = currLine.substring(100, 108).trim();

// saves processed data as one line of the output file

bw.write(stateCode + "," + pop + "," + childPop + ","

+ childPovPop + " ");

}

// prints a message confirming successful completion of operations

System.out.println(" The data has been edited and saved to "

+ args[1] + " successfully. ");

}

catch (IOException e)

{ // checks for IOExceptions

System.out.println("/nI/O Exception: " + e.getMessage() + " ");

return;

}

}

}