Muhammad Rifki

import javax.swing.table.DefaultTableModel;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 */
public class NewJFrame extends javax.swing.JFrame {

    int pilihan, index;
    String penjualan[][] = new String [100][4];
    String jenisbarangstring = null;
    String namabarang = null;
    String jumlahbarang = null;
    String hargasatuan = null;
    int rowselected;
  
    public NewJFrame() {
        initComponents();
        index = 0;
    }

    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                         
    private void initComponents() {

        buttonGroup1 = new javax.swing.ButtonGroup();
        buttonGroup2 = new javax.swing.ButtonGroup();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();
        jPanel1 = new javax.swing.JPanel();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jComboBox1JenisBarang = new javax.swing.JComboBox();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jLabel5 = new javax.swing.JLabel();
        jLabel6 = new javax.swing.JLabel();
        jTextField1Jumlah = new javax.swing.JTextField();
        jTextField2HargaSatuan = new javax.swing.JTextField();
        jTextField3NamaBarang = new javax.swing.JTextField();
        jLabel7 = new javax.swing.JLabel();
        jLabel8 = new javax.swing.JLabel();
        jButton1Tambah = new javax.swing.JButton();
        jButton2Ubah = new javax.swing.JButton();
        jButton3Hapus = new javax.swing.JButton();
        jScrollPane2 = new javax.swing.JScrollPane();
        jTable2Belanja = new javax.swing.JTable();

        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null}
            },
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4"
            }
        ));
        jScrollPane1.setViewportView(jTable1);

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setText("Nama Barang");

        jLabel2.setText(":");

        jComboBox1JenisBarang.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "", "Beras", "Gula", "Minyak Goreng" }));
        jComboBox1JenisBarang.addItemListener(new java.awt.event.ItemListener() {
            public void itemStateChanged(java.awt.event.ItemEvent evt) {
                jComboBox1JenisBarangItemStateChanged(evt);
            }
        });
        jComboBox1JenisBarang.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jComboBox1JenisBarangActionPerformed(evt);
            }
        });

        jLabel3.setText("Jenis Barang");

        jLabel4.setText("Jumlah Barang");

        jLabel5.setText("Harga Satuan");

        jLabel6.setText(":");

        jTextField1Jumlah.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField1JumlahActionPerformed(evt);
            }
        });

        jTextField2HargaSatuan.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jTextField2HargaSatuanActionPerformed(evt);
            }
        });

        jLabel7.setText(":");

        jLabel8.setText(":");

        jButton1Tambah.setText("Tambah");
        jButton1Tambah.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1TambahActionPerformed(evt);
            }
        });

        jButton2Ubah.setText("Ubah");
        jButton2Ubah.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton2UbahMouseClicked(evt);
            }
        });

        jButton3Hapus.setText("Hapus");

        jTable2Belanja.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {

            },
            new String [] {
                "ID Transaksi", "Nama Barang", "Jumlah Barang", "Harga Satuan", "Total Harga"
            }
        ));
        jScrollPane2.setViewportView(jTable2Belanja);

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addGap(26, 26, 26)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addComponent(jLabel4)
                        .addGap(0, 0, Short.MAX_VALUE))
                    .addGroup(jPanel1Layout.createSequentialGroup()
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jLabel3)
                            .addComponent(jLabel1))
                        .addGap(18, 18, 18)
                        .addComponent(jLabel2, javax.swing.GroupLayout.PREFERRED_SIZE, 9, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addComponent(jLabel8, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE))
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addGroup(jPanel1Layout.createSequentialGroup()
                                        .addComponent(jComboBox1JenisBarang, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                                        .addComponent(jLabel5)
                                        .addGap(10, 10, 10)
                                        .addComponent(jLabel6)
                                        .addGap(18, 18, 18)
                                        .addComponent(jTextField2HargaSatuan, javax.swing.GroupLayout.PREFERRED_SIZE, 48, javax.swing.GroupLayout.PREFERRED_SIZE))
                                    .addComponent(jTextField3NamaBarang, javax.swing.GroupLayout.PREFERRED_SIZE, 162, javax.swing.GroupLayout.PREFERRED_SIZE)
                                    .addComponent(jTextField1Jumlah, javax.swing.GroupLayout.PREFERRED_SIZE, 68, javax.swing.GroupLayout.PREFERRED_SIZE))
                                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                            .addGroup(jPanel1Layout.createSequentialGroup()
                                .addComponent(jButton1Tambah)
                                .addGap(27, 27, 27)
                                .addComponent(jButton2Ubah)
                                .addGap(26, 26, 26)
                                .addComponent(jButton3Hapus)
                                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))))))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap())
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(jPanel1Layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(jComboBox1JenisBarang, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel5)
                    .addComponent(jLabel3)
                    .addComponent(jLabel6, javax.swing.GroupLayout.PREFERRED_SIZE, 25, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jTextField2HargaSatuan, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(34, 34, 34)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(jTextField3NamaBarang, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel7, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(17, 17, 17)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel4)
                    .addComponent(jTextField1Jumlah, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel8, javax.swing.GroupLayout.PREFERRED_SIZE, 32, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addGap(39, 39, 39)
                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1Tambah)
                    .addComponent(jButton2Ubah)
                    .addComponent(jButton3Hapus))
                .addGap(18, 18, 18)
                .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jPanel1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(0, 0, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                       

    private void jTextField1JumlahActionPerformed(java.awt.event.ActionEvent evt) {                                                 
        // TODO add your handling code here:
      
    }                                               

    private void jTextField2HargaSatuanActionPerformed(java.awt.event.ActionEvent evt) {                                                     
        // TODO add your handling code here:
    }                                                     

    private void jComboBox1JenisBarangItemStateChanged(java.awt.event.ItemEvent evt) {                                                     
        // TODO add your handling code here:
        cekhargasatuan();
    }                                                     

    private void jButton1TambahActionPerformed(java.awt.event.ActionEvent evt) {                                             
        // TODO add your handling code here:
        tambahbarang();
        jComboBox1JenisBarang.setSelectedIndex(0);
        jTextField3NamaBarang.setText("");
        jTextField1Jumlah.setText("");
        jTextField2HargaSatuan.setText("");
      
      
    }                                             

    private void jComboBox1JenisBarangActionPerformed(java.awt.event.ActionEvent evt) {                                                     
        // TODO add your handling code here:
    }                                                   

    private void jButton2UbahMouseClicked(java.awt.event.MouseEvent evt) {                                         
        // TODO add your handling code here:
        rowselected = jTable2Belanja.getSelectedRow();
        System.out.println("rowselected : "+rowselected);
        namabarang = (String) jTable2Belanja.getValueAt(rowselected, 1);
        jumlahbarang = (String) jTable2Belanja.getValueAt(rowselected, 2);
        hargasatuan = (String) jTable2Belanja.getValueAt(rowselected, 3);
      
        jTextField3NamaBarang.setText(namabarang);
        jTextField3NamaBarang.setText(jumlahbarang);
        jTextField3NamaBarang.setText(hargasatuan);
    }                                       

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                   
    private javax.swing.ButtonGroup buttonGroup1;
    private javax.swing.ButtonGroup buttonGroup2;
    private javax.swing.JButton jButton1Tambah;
    private javax.swing.JButton jButton2Ubah;
    private javax.swing.JButton jButton3Hapus;
    private javax.swing.JComboBox jComboBox1JenisBarang;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JLabel jLabel7;
    private javax.swing.JLabel jLabel8;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JTable jTable1;
    private javax.swing.JTable jTable2Belanja;
    private javax.swing.JTextField jTextField1Jumlah;
    private javax.swing.JTextField jTextField2HargaSatuan;
    private javax.swing.JTextField jTextField3NamaBarang;
    // End of variables declaration                 
private void tambahbarang(){
    penjualan[index][0] = jTextField3NamaBarang.getText();
    System.out.println(penjualan[index][0]);
    penjualan[index][1] = jTextField1Jumlah.getText();
    System.out.println(penjualan[index][1]);
    penjualan[index][2] = jTextField2HargaSatuan.getText();
    System.out.println(penjualan[index][2]);
    int a = Integer.parseInt(jTextField1Jumlah.getText());
    int b = Integer.parseInt(jTextField2HargaSatuan.getText());
    int total = a*b;
    penjualan[index][3] = String.valueOf(total);
    System.out.println(penjualan[index][3]);
  
  
    DefaultTableModel model = (DefaultTableModel) jTable2Belanja.getModel();
  
    model.addRow(new Object[] {(index + 1), penjualan[index][0],
        penjualan[index][1], penjualan[index][2], penjualan[index][3]});
}

private void cekhargasatuan()
{
    jenisbarangstring = (String)jComboBox1JenisBarang.getSelectedItem();
    if(jenisbarangstring.equalsIgnoreCase("beras"))
    {
        hargasatuan = "3000";
    }
    else if (jenisbarangstring.equalsIgnoreCase("gula"))
    {   
        hargasatuan = "4000";
    }
    else if (jenisbarangstring.equalsIgnoreCase("minyak goreng"))
    {
        hargasatuan = "5000";
    }
    else
    {
        hargasatuan = null;
    }
    jTextField2HargaSatuan.setText(hargasatuan);
    }
}

package robot;

/**
 *
 */
public class robot1{
    int  harga, pil;
    String produsen;
   
void jepang()
    {
       
        produsen= "jepang";
        harga = 25000000;
       
        System.out.println("Yang anda pilih : "+produsen+"\nharga : Rp. "+harga);
    }

void indonesia()
    {
        produsen= "indonesia";
        harga = 4000000;
       
       
        System.out.println("Yang anda pilih : "+produsen+"\nharga : Rp. "+harga);
    }

void amerika()
    {
        produsen= "amerika";
        harga = 35000000;
       
       
        System.out.println("Yang anda pilih : "+produsen+"\nharga : Rp. "+harga);
}
}


Source code untuk memanggil Class Robot:

package robot;
import java.util.Scanner;
/**
 *
 * @author Muhammad Rifki
 */
public class Robot{
           
           
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
     
        robot1x = new robot1();
        Scanner s = new Scanner(System.in);
        System.out.println("1. jepang\n2. indonesia\n3. amerika");
        System.out.print("Masukkan pilihan = ");
        x.pil=s.nextInt();
        switch(x.pil){
            case 1 :
                x.jepang();
                break;
            case 2 :
                x.indonesia();
            case 3 :
                x.amerika();
                break;

Kali ini kita akan belajar menggunakan "switch case", dengan menggunakan "switch case" kita dapat membuat menu yang menyediakan pilihan pada saat output dijalankan. Sementara "case" sendiri berarti pilihan, contohnya "case 1" pada gambar berikut dapat juga berarti pilihan pertama, setiap case memiliki harga, diskon, dan bonus yang berbeda masing-masingnya. Kita juga menggunakan "break" setelah selesai setiap case nya. Tidak lupa untuk memberikan "default" agar jika kode yang dimasukkan tidak ada pada case yang tersedia, kita dapat memberi peringatan "Kode yang anda masukkan salah" atau kata-kata yang lainnya sesuai keinginan kita. Untuk lebih jelasnya bisa dilihat pada gambar dibawah ini

Tampilan ketika kita memasukkan seperti yang ada di salah satu case :

Tampilan ketika memasukkan kode yang tidak terdapat pada salah satu case :

Untuk saat ini sekian dulu, tidak lupa saya sampaikan terima kasih pada teman-teman saya karena dengan melihat tutorial dari blog-blog teman-teman saya juga dapat memahaminya sedikit demi sedikit.