Membuat Aplikasi Sederhana Menggunakan Komponen Swing Menu (Mencari Nilai Rata-Rata)

    private void okActionPerformed(java.awt.event.ActionEvent evt) {                                   

        double total;
        String nama = Nama.getText();
        String makul = Makul.getText();
        String kelas = Kelas.getText();
        String A = "Istimewa, Mutu : A";
        String B = "Memuaskan, Mutu : B";
        String C = "Cukup, Mutu : C";
        String D = "Kurang, Mutu : D";
        String E = "Gagal, Mutu : E";
        
        int tgs = Integer.parseInt(Tugas.getText());
        int qs = Integer.parseInt(Quis.getText());
        int ts = Integer.parseInt(Uts.getText());
        int as = Integer.parseInt(Uas.getText());
        int hdr = Integer.parseInt(Hadir.getText());
        
        double tugas = tgs;
        double quis = qs;
        double uts = ts;
        double uas = as;
        double hadir = hdr;
        
        total =(0.1*hadir)+(0.1*tugas)+(0.05*quis)+(0.25*uts)+(0.5*uas);
        
        if (total>80 && total<=100) {
            cn.setText(nama);
            ck.setText(kelas);
            cmk.setText(makul);
            cna.setText(""+total);
            cket.setText(A);
        }
        else if (total>=70 && total<80) {
             cn.setText(nama);
            ck.setText(kelas);
            cmk.setText(makul);
            cna.setText(""+total);
            cket.setText(B);
        }
        else if (total>=60 && total<70) {
             cn.setText(nama);
            ck.setText(kelas);
            cmk.setText(makul);
            cna.setText(""+total);
            cket.setText(C);
        }
        else if (total>=45 && total<60) {
             cn.setText(nama);
            ck.setText(kelas);
            cmk.setText(makul);
            cna.setText(""+total);
            cket.setText(D);
        }
        else if (total<45) {
             cn.setText(nama);
            ck.setText(kelas);
            cmk.setText(makul);
            cna.setText(""+total);
            cket.setText(E);
        }
        else {
            JOptionPane.showMessageDialog(null, "Data yang anda masukkan ngawur coy :v :v :v ","Error",0);
        }

    }     

   private void resetActionPerformed(java.awt.event.ActionEvent evt) {                                      
       
        Nama.setText(null);
        Kelas.setText(null);
        Makul.setText(null);
        Quis.setText(null);
        Hadir.setText(null);
        Tugas.setText(null);
        Uts.setText(null);
        Uas.setText(null);
        
        //panel 2
        ck.setText(null);
        cn.setText(null);
        cna.setText(null);
        cket.setText(null);
        cmk.setText(null);
        
    }