Belajar JAVA: Mencetak Data Nilai Siswa PAKE (OPERATOR ++ --)

public class  Variabel3
{
    String NIM ="111150000",nama="DANU ANGGA WIJAYA";
    String mataKuliah="PBO";
    byte nilAbsen=100,nilTugas=90,nilUTS=90,nilUAS=95;
    byte jmlSKS=9;
    int biayaPerSKS=900000;
   
    void nyetak(){
    System.out.println ("=======================");
    System.out.println ("\t\tData Mahasiswa");
    System.out.println ("=======================");
    System.out.println ("NIM        :" +NIM);   
    System.out.println ("NAMA        :"+nama);   
    System.out.println ("Mata Kuliah    :"+mataKuliah);   
    System.out.println ("SKS        :"+jmlSKS);
    System.out.println ("Biaya per SKS    :"+biayaPerSKS);
    System.out.println ("Total Biaya    :" +(jmlSKS*biayaPerSKS));
    System.out.println ("\nNilai Absen    :"+nilAbsen);
    System.out.println ("Nilai Tugas    :"+nilTugas);
    System.out.println ("NilaiUTS    :"+nilUTS);
    System.out.println ("Nilai UAS    :"+nilUAS);
    System.out.println ("======================");
    int total=((nilAbsen*10/100)+(nilTugas*20/100)+(nilUTS*30/100)+(nilUAS*40/100));
    System.out.println ("Nilai Total:"+total);
    System.out.println ("=====================");
    System.out.println ("Nilai UAS++:"+(nilUAS++));
    System.out.println ("Nilai UAS:"+(nilUAS));
    System.out.println ("Nilai ++UAS:"+(++nilUAS));
    System.out.println ("Nilai UAS--:"+(nilUAS--));
    System.out.println ("Nilai --UAS:"+(--nilUAS));
    System.out.println ("Nilai UAS:" +(nilUAS));
    System.out.println ("======================");
        }
public static void main(String[]args)
{
    //membuat object
    Variabel3 MHS =new Variabel3();
    MHS.nyetak();
    }
}