Question

Please write a java program to write to a text file and to read from a text file.

Answer 1

//WriteToFile.java
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.Scanner;
public class WriteToFile {
  public static void main(String args[]) throws FileNotFoundException, UnsupportedEncodingException {
    Scanner scanner = new Scanner(System.in);
    System.out.println("Enter file name to write data:");
    String fileName = scanner.nextLine();
    System.out.println("Enter data:");
    String data = scanner.nextLine();
    PrintWriter writer = new PrintWriter(fileName, "UTF-8");
    writer.write(data);
    writer.close();
  }
}

////////////////////////////////////////////////////////////

import java.io.*;
import java.util.Scanner;
public class ReadText {
  public static void main(String[] args) throws IOException {
    String fileName;
    Scanner scanner = new Scanner(System.in);
    System.out.print("Enter file name: ");
    fileName = scanner.nextLine();
    File file = new File(fileName);
    try {
      // open the file
      Scanner scan = new Scanner(file);
      // if file has contents to read
      // loop to read the contents of the file
      String s;
      while(scan.hasNext()) {
        s = scan.nextLine()+" ";
        System.out.println(s);
      }
      scan.close();
      // close the Scanner object
    } catch (FileNotFoundException e) {
      // catch the exception if file not present
      System.out.println("File " + file.getName() + " not present ");
      System.exit(0);
    }
  }
}