Reading from file in java?

You could use buffered reader to read the whole line as string then split the string using space as delimiter. That should give you array of strings, str[0] will be ADDSTUDENT, str[1] will be id etc.

Same in scanner can be achieved in scanner using useDelimiter(String pattern) method

set in.useDelimiter(patternYouNeed)

pattern you need will be newline (\n) or return carriage () pick which suits your needs.

Import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Scanner;

public class Program {
public static void main(String[] args) {
File fileIn = new File("C:\\Users\\LENOVO\\Desktop\\cool.t…
File fileOut = new File("C:\\Users\\LENOVO\\Desktop\\JACK.t…

Service service = new Service();
try {
Student student = service.read(fileIn);
service.save(fileOut, student);
} catch (Exception ex) {
ex.printStackTrace();
}
}
}

class Service {
public Student read(File source) throws FileNotFoundException {
Student student = null;
Scanner file = new Scanner( source);
if (file.hasNext(. {
String line = file.nextLine();
String action = line.split("\\s")[0];
if ("ADDSTUDENT".equalsIgnoreCase( action. {
int pos = line.indexOf(' ');
student = new Student( line.substring(pos + 1. ;
}
}
file.close();
return student;
}

public void save(File file, Student student) throws IOException {
if (!file.exists(. {
file.createNewFile();
}
FileOutputStream fos = new FileOutputStream( file);
byte[] data = student.toString( ).getBytes();
fos.write(data);
fos.flush();
fos.close();
}
}

class Student {
private int id;
private String firstName;
private String lastName;

public Student() {
}

public Student(String value) {
String[] fields = value.split("\\s");
id = Integer.parseInt(fields[0]);
firstName = fields[1];
lastName = fields[2];
}

@Override
public String toString() {
return String.format("Id:%d FirstName:%s LastName:%s", id, firstName,
lastName);
}
}