Latihan - Pembelian Tiket Kereta Api

1. Pendeklarasian Variable :

public class quiz extends javax.swing.JFrame {

int anak,dewasa,harga,beli,total;

2. Listing Button Selesai :

int answer = JOptionPane.showConfirmDialog(null, "Thanks", "Selesai", JOptionPane.OK_OPTION);

       

        if (answer == JOptionPane.OK_OPTION)

        {

            dispose();

        }

3. Listing Combo Box Kode Kereta :

if(cmb_kode.getSelectedItem().equals("TR111"))

            {

                t_kereta.setText("MATARMAJA");

                cmb_jurusan.removeItem("TANAH ABANG-TEGAL");

                cmb_jurusan.removeItem("TANAH ABANG-MADIUN");

                cmb_jurusan.removeItem("GAMBIR-KUTOARJO");

                cmb_jurusan.removeItem("GAMBIR-LEMPUYANGAN");

                cmb_jurusan.addItem("PASAR SENEN-TEGAL");

                cmb_jurusan.addItem("PASAR SENEN-MADIUN");

            }

            else if(cmb_kode.getSelectedItem().equals("TR222"))

            {

                t_kereta.setText("BRANTAS");

                cmb_jurusan.removeItem("PASAR SENEN-TEGAL");

                cmb_jurusan.removeItem("PASAR SENEN-MADIUN");

                cmb_jurusan.removeItem("GAMBIR-KUTOARJO");

                cmb_jurusan.removeItem("GAMBIR-LEMPUYANGAN");

                cmb_jurusan.addItem("TANAH ABANG-TEGAL");

                cmb_jurusan.addItem("TANAH ABANG-MADIUN");

            }

                else if(cmb_kode.getSelectedItem().equals("TR333"))

                {

                    t_kereta.setText("BENGAWAN");

                    cmb_jurusan.removeItem("PASAR SENEN-TEGAL");

                    cmb_jurusan.removeItem("PASAR SENEN-MADIUN");

                    cmb_jurusan.removeItem("TANAH ABANG-TEGAL");

                    cmb_jurusan.removeItem("TANAH ABANG-MADIUN");

                    cmb_jurusan.addItem("GAMBIR-KUTOARJO");

                    cmb_jurusan.addItem("GAMBIR-LEMPUYANGAN");

                }

                    else if(cmb_kode.getSelectedItem().equals("--KODE KERETA--"))

                    {

                        t_kereta.setText("");

                        cmb_jurusan.removeItem("PASAR SENEN-TEGAL");

                        cmb_jurusan.removeItem("PASAR SENEN-MADIUN");

                        cmb_jurusan.removeItem("TANAH ABANG-TEGAL");

                        cmb_jurusan.removeItem("TANAH ABANG-MADIUN");

                        cmb_jurusan.removeItem("GAMBIR-KUTOARJO");

                        cmb_jurusan.removeItem("GAMBIR-LEMPUYANGAN");

       

                        t_penumpang.setText("");

                        cmb_kode.setSelectedItem("--KODE KERETA--");

                        t_kereta.setText("");

       

                        cmb_jurusan.setSelectedItem("--JURUSAN--");

                        buttonGroup1.clearSelection();

                        t_tarif.setText("");

       

                        t_beli.setText("");

                        t_bayar.setText("");

                        t_penumpang.requestFocus();

       

                    }

4. Listing Combobox Jurusan Kereta :

if(cmb_jurusan.getSelectedItem().equals("--JURUSAN--"))

    {

        buttonGroup1.clearSelection();

        t_tarif.setText("");

    }

        else if(cmb_jurusan.getSelectedItem().equals("PASAR SENEN-TEGAL"))

        {

            anak=30000;

            dewasa=60000;

        }

            else if(cmb_jurusan.getSelectedItem().equals("PASAR SENEN-MADIUN"))

            {

                anak=35000;

                dewasa=65000;

            }

                else if(cmb_jurusan.getSelectedItem().equals("TANAH ABANG-TEGAL"))

                {

                    anak=40000;

                    dewasa=70000;

                }

                    else if(cmb_jurusan.getSelectedItem().equals("TANAH ABANG-TEGAL"))

                    {

                        anak=45000;

                        dewasa=75000;

                    }

                        else if(cmb_jurusan.getSelectedItem().equals("GAMBIR-KUTOARJO"))

                        {

                            anak=50000;

                            dewasa=80000;

                        }

                                else if(cmb_jurusan.getSelectedItem().equals("GAMBIR-LEMPUYANGAN"))

                                {

                                    anak=55000;

                                    dewasa=850000;

                                }

   

5. Listing Radio Anak :

if(rd_1.isSelected())

        {

            t_tarif.setText(String.valueOf(anak));

            t_bayar.setText(String.valueOf(0));

            t_beli.setText("");

            t_beli.requestFocus();

        }

6. Listing Radio Dewasa :

if(rd_2.isSelected())

        {

           t_tarif.setText(String.valueOf(dewasa));

           t_bayar.setText(String.valueOf(0));

           t_beli.setText("");

           t_beli.requestFocus();

        }

7. Listing Button Lagi Atau Bersih :

        t_penumpang.setText("");

        cmb_kode.setSelectedItem("--KODE KERETA--");

        t_kereta.setText("");

       

        cmb_jurusan.setSelectedItem("--JURUSAN--");

        buttonGroup1.clearSelection();

        t_tarif.setText("");

       

        t_beli.setText("");

        t_bayar.setText("");

8. Listing Total Bayar pada Text Field Jumlah Beli ( Keypress ) :

        beli=Integer.parseInt(t_beli.getText());

        harga=Integer.parseInt(t_tarif.getText());

        total=beli*harga;

        t_bayar.setText(String.valueOf(total));

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