How to find and replace a given string with new string in a file

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class ReplaceUsingReplaceAll {

	public static void main(String[] args) throws IOException {

		/* Display the current sampleFile.txt file contents */
		displayFileContent("C:\\Users\\Nagendra\\sampleFile.txt","old");

		/* Re-open the same sampleFile.txt file using FileReader, Scanner
        to search for a given word in each line of this file */

		FileReader fileRead=new FileReader("C:\\Users\\Nagendra\\sampleFile.txt");
		@SuppressWarnings("resource")
		Scanner scanFile=new Scanner(fileRead);
		System.out.println();
		Scanner inpStr=new Scanner(System.in);
		System.out.print("Enter the String to be searched in the given file: ");
		String strToSrch=inpStr.next();

		System.out.print("Enter the String to be replaced in the given file: ");
		String strToReplace=inpStr.next();
		System.out.println("\n");

		/* Open the new sampleFileUpdated.txt file using BufferedWriter and FileWriter */
		FileWriter fWrite=new FileWriter("C:\\Users\\Nagendra\\SampleFileUpdated.txt");
		BufferedWriter  fileToWrite = new BufferedWriter(fWrite);

		/* Read each line of sampleFile.txt, use the replaceAll method of String class */
		while (scanFile.hasNextLine()) {

			/*Write the new line into the sampleFileUpdated.txt file after
            replacing with a given word in each line of sampleFile.txt file*/
			String eachLine=scanFile.nextLine();
			fileToWrite.write(eachLine.replaceAll(strToSrch,strToReplace)+"\n");
		}
		fileToWrite.close();

		/* Display the newly created sampleFileUpdated.txt file contents */
		displayFileContent("C:\\Users\\Nagendra\\SampleFileUpdated.txt","new");
		inpStr.close();
	}

	private static void displayFileContent(String filePath, String neworold) throws IOException {

		/* Display the sample file contents to the console using the
        BufferedReader and FileReader */       

		FileReader fRead=new FileReader(filePath);
		@SuppressWarnings("resource")
		BufferedReader  fileToRd = new BufferedReader(fRead);
		String lineRead;

		System.out.println("The contents of the "+neworold+" file are below");
		System.out.println("----------------------------------");
		while ((lineRead= fileToRd.readLine()) != null)
			System.out.println(lineRead);
		fileToRd.close();
	}
}