Membuat Kalkulator dengan Java Applet

saya hanya ingin berbagi Ilmu yg sudah saya pelajari sebelumnya, dan saya akan memberi cara mebuat seperti diatas sebisa saya....

   Ini Langkah-langkanya ya gan...
1. Instal Java Netbeans dulu kalo belum pnya aplikasinya
2. Baru buka Netbeans
3. Anda bikin komponen"nya dulu seperti kotak" yg diatas
4. Kopy kode yg ada dibawah ini ya...??

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package habibi; /** * * @author Guest */ public class kalkulator2 extends javax.swing.JApplet { /** * Initializes the applet kalkulator2 */ @Override public void init() { /* 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(kalkulator2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (InstantiationException ex) { java.util.logging.Logger.getLogger(kalkulator2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (IllegalAccessException ex) { java.util.logging.Logger.getLogger(kalkulator2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } catch (javax.swing.UnsupportedLookAndFeelException ex) { java.util.logging.Logger.getLogger(kalkulator2.class.getName()).log(java.util.logging.Level.SEVERE, null, ex); } //</editor-fold> /* Create and display the applet */ try { java.awt.EventQueue.invokeAndWait(new Runnable() { public void run() { initComponents(); } }); } catch (Exception ex) { ex.printStackTrace(); } } /** * This method is called from within the init() method 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() { jInternalFrame1 = new javax.swing.JInternalFrame(); jLabel1 = new javax.swing.JLabel(); Bil1 = new javax.swing.JLabel(); Bil2 = new javax.swing.JLabel(); txtBil1 = new javax.swing.JTextField(); txtBil2 = new javax.swing.JTextField(); lblOperator = new javax.swing.JLabel(); cmbOpt = new javax.swing.JComboBox(); cmdOk = new javax.swing.JButton(); Hasil = new javax.swing.JLabel(); txtHasil = new javax.swing.JTextField(); jInternalFrame1.setVisible(true); jLabel1.setFont(new java.awt.Font("Snap ITC", 2, 14)); // NOI18N jLabel1.setForeground(new java.awt.Color(204, 0, 0)); jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); jLabel1.setText("Font Perhitungan"); Bil1.setFont(new java.awt.Font("Snap ITC", 2, 12)); // NOI18N Bil1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); Bil1.setText("Bil 1 :"); Bil2.setFont(new java.awt.Font("Snap ITC", 2, 12)); // NOI18N Bil2.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); Bil2.setText("Bil 2 :"); txtBil1.setFont(new java.awt.Font("Snap ITC", 2, 12)); // NOI18N txtBil1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { txtBil1ActionPerformed(evt); } }); txtBil2.setFont(new java.awt.Font("Snap ITC", 2, 12)); // NOI18N lblOperator.setFont(new java.awt.Font("Snap ITC", 2, 12)); // NOI18N lblOperator.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); lblOperator.setText("Operator :"); cmbOpt.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "+", "-", "*", "/", " " })); cmdOk.setText("Ok"); cmdOk.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { cmdOkActionPerformed(evt); } }); Hasil.setFont(new java.awt.Font("Snap ITC", 2, 12)); // NOI18N Hasil.setHorizontalAlignment(javax.swing.SwingConstants.CENTER); Hasil.setText("Hasilnya :"); txtHasil.setFont(new java.awt.Font("Snap ITC", 2, 12)); // NOI18N txtHasil.setForeground(new java.awt.Color(255, 0, 0)); javax.swing.GroupLayout jInternalFrame1Layout = new javax.swing.GroupLayout(jInternalFrame1.getContentPane()); jInternalFrame1.getContentPane().setLayout(jInternalFrame1Layout); jInternalFrame1Layout.setHorizontalGroup( jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jInternalFrame1Layout.createSequentialGroup() .addGroup(jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jInternalFrame1Layout.createSequentialGroup() .addGap(75, 75, 75) .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 170, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(jInternalFrame1Layout.createSequentialGroup() .addContainerGap() .addGroup(jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jInternalFrame1Layout.createSequentialGroup() .addComponent(Hasil, javax.swing.GroupLayout.PREFERRED_SIZE, 55, javax.swing.GroupLayout.PREFERRED_SIZE) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(txtHasil, javax.swing.GroupLayout.PREFERRED_SIZE, 82, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGroup(jInternalFrame1Layout.createSequentialGroup() .addGroup(jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false) .addComponent(Bil2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE) .addComponent(Bil1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)) .addGap(22, 22, 22) .addGroup(jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING) .addComponent(txtBil1, javax.swing.GroupLayout.PREFERRED_SIZE, 59, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(txtBil2, javax.swing.GroupLayout.PREFERRED_SIZE, 59, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(18, 18, 18) .addGroup(jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jInternalFrame1Layout.createSequentialGroup() .addComponent(lblOperator) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED) .addComponent(cmbOpt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addComponent(cmdOk)))))) .addContainerGap(84, Short.MAX_VALUE)) ); jInternalFrame1Layout.setVerticalGroup( jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(jInternalFrame1Layout.createSequentialGroup() .addComponent(jLabel1) .addGap(18, 18, 18) .addGroup(jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(Bil1) .addComponent(txtBil1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(lblOperator) .addComponent(cmbOpt, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addGroup(jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(Bil2) .addComponent(txtBil2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addComponent(cmdOk)) .addGap(27, 27, 27) .addGroup(jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE) .addComponent(Hasil) .addComponent(txtHasil, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)) .addGap(0, 46, Short.MAX_VALUE)) ); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(20, 20, 20) .addComponent(jInternalFrame1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(13, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addComponent(jInternalFrame1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(30, Short.MAX_VALUE)) ); }// </editor-fold> private void txtBil1ActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: } private void cmdOkActionPerformed(java.awt.event.ActionEvent evt) { // TODO add your handling code here: double bil1 = Double.parseDouble(txtBil1.getText()); double bil2 = Double.parseDouble(txtBil2.getText()); double hasil=0; int op = cmbOpt.getSelectedIndex(); switch (op){ case 0: hasil=bil1+bil2 ; break ; case 1: hasil=bil1-bil2 ; break ; case 2: hasil=bil1*bil2 ; break ; case 3: hasil=bil1/bil2 ; break ; } txtHasil.setText(hasil+""); } // Variables declaration - do not modify private javax.swing.JLabel Bil1; private javax.swing.JLabel Bil2; private javax.swing.JLabel Hasil; private javax.swing.JComboBox cmbOpt; private javax.swing.JButton cmdOk; private javax.swing.JInternalFrame jInternalFrame1; private javax.swing.JLabel jLabel1; private javax.swing.JLabel lblOperator; private javax.swing.JTextField txtBil1; private javax.swing.JTextField txtBil2; private javax.swing.JTextField txtHasil; // End of variables declaration private static class cmdOpt { public cmdOpt() { } } }

3. Setelah itu kalian simpan ato klik Ctrl+S

•  Kode tg warna merah itu syntax yg harus kita buat yg di dalam kotak OK itu, dan yg warna hitam itu syntax yg sudah di sediakan di dalam aplikasi Netbeans..

NB : Jika ada masalah silakan tinggalkan komentar. :)
        soalnya saya juga lagi belajar, maaf saja kalo bahasanya kurang pas/kurang jelas ya...??
        hehehehe :)  
                                                
                                                  
                                              ~~Selamat Mencoba~~