Java Lab_12_Ans_3

Write a Java program to perform the following tasks:
• Reading a text file
• Writing in a text file
• Searching in a text file

solution

1. Create a Java application. Chapter10_Exercise03.
2. Create a class. FileOperation. in the Java application. Chapter10_Exercise03.
3. Replace the existing code in the FileOperation.java file with the following code:

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.util.Scanner;
public class FileOperation {
public void readFile() {
Scanner sc = new Scanner(System.in);
String fileName;
System.out.print("Enter the text file name that you want to read from the D:\\ drive: "); fileName = sc.nextLine();
try (BufferedReader br = new BufferedReader(new FileReader("D:\\" + fileName + ".txt "))) {
String s;
System.out.println("\nThe " + fileName + " contains the following text:\n");
System.out.println
while ((s = br.readLine()) != null) {
System.out.println(s);
}
} catch (Exception e) {
System.out.println("File does not exists."); menu();
}
}
public void writeFile() {
Scanner sc = new Scanner(System.in);
String fileName, text;
System.out.print("Enter the file name from the D:\\ drive in which you 'want to write: "); fileName = sc.nextLine ();
System.out.print("Enter the text you want to write in the " + fileName + " file: "); text = sc.nextLine();
try {
FileWriter fos = new FileWriter("D:\\" + fileName + ".txt", true);
BufferedWriter bw = new BufferedWriter(fos); bw.newLine(); bw.write(text);
bw.close (); fos.close();
System.out.println("\nThe text has been added in the file");
} catch (Exception e) {
System.out.println("File does not exists"); menu();
}
}
public void searchFileO {
Scanner sc = new Scanner(System.in);
String fileName, text; int counter = 0, flag = 0;
System.out.print("Enter the file name from the D:\\ drive in which you want to search: ");
fileName = sc.nextLine();
System.out.print("Enter the string you want to search in the " + fileName + " file: "); text = sc.nextLine();
try (BufferedReader br = new BufferedReader(new FileReader("D:\\" + fileName + ".txt "))) {
String s;
while ((s = br.readLine()) != null) {
String splitData() = s.split(" ");
{
for (int i = 0; i < splitData.length; i++) if (splitData(i].equals(text)) {
if (splitData(i].equals(text)) {
counter++; flag = 1;
}
}
} catch (Exception e) {
System.out.println("File does not exits"); menu () ;
}
if (flag == 1) (
if (counter == 1) {
System.out.println("\"" + text + "\" has occured " + counter + " time");
} else {
System.out.println("\"" + text + "\" has occured " + counter + " times");
}
} else {
System.out.println("The entered word doest not exist in the file.");
}

public void menu() { int option;
Scanner sc = new Scanner(System.in);
System, out. print In (" \n-----Menu---------") ;
System.out.println("1. Reading");
System.out.println("2. Writing");
System.out.println("3. Searching");
System.out.println("4. Exit");
System.out.print("\nChoose the option: ")
option = sc.nextInt();
switch (option) { case 1:
readFile(); menu(); break; case 2:
writeFile(); menu(); break; case 3:
searchFile();
menu(); break; case 4:
System.exit(0); break; default:
System.out.println("Incorrect menu option");
menu(); break;
}
}
public static void main(String!) args) {
FileOperation fo = new FileOperation() fo.menu();
}
}
4. Compile and execute the Chapter!0_Exercise03 Java application.