Contoh Program Operasi File, Menulis ke File (JAVA)

//author @ridhorex
package operasifile;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintStream;
import java.util.Scanner;
public class Operasifile {
    public static void main(String[] args) throws FileNotFoundException{
    Scanner input = new Scanner(System.in);
        PrintStream diskWriter = new PrintStream("mhs.txt");
        String nama, nhuruf = null, ket = null, end;
        int nilai;
        System.out.print("Masukkan Nama : ");
        nama = input.next();
        System.out.print("Masukkan Nilai : ");
        nilai = input.nextInt();
        if(nilai >= 65){
            ket = "Lulus";
        }
        else if(nilai<65){
            ket = "Tidak Lulus";
        }
        if(nilai<65){
            nhuruf = "C";
        }
        else if(nilai<75){
            nhuruf = "B";
        }
        else if(nilai<85){
            nhuruf = "A-";
        }
        else if(nilai<95){
            nhuruf = "A";
        }
        else if(nilai <100){
            nhuruf = "A+";
        }
        System.out.println(nhuruf+", "+nama+" "+ket);
        end = nama+","+nilai+","+nhuruf+","+ket;
        diskWriter.println(end);
    }
}