File writer

import java.io.FileWriter;
import java.io.IOException;

public class lab5 {
    public static void main(String[] args) {
        try(FileWriter fw = new FileWriter("file.txt")) {
            fw.write("lewis has a small nob");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

File reader

import java.io.FileReader;
import java.io.IOException;

public class lab5 {
    public static void main(String[] args) {
        try(FileReader fr = new FileReader("file.txt")) {
            int i;
            while ((i = fr.read()) != -1) {
                System.out.print((char)i);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}