Kalkulator Sederhana

Assalamualaikum warahmatullahi wabarakatuh.
                      
Pada blog saya kali ini, saya akan menjelaskan kodingan tentang aplikasi Kalkulator. 



/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package latihan1;

/**
 *
 * @author oryza
 */
public class Game extends // Nama kelasnya adalah kelas game//
javax.swing.JFrame { Merupakan Bingkai//

    /**
     * Creates new form Game// Membuat game//
     */
    public Game() {
        this.setUndecorated(true);
        this.setLocationRelativeTo(null);
        initComponents();
    }

    /**
     * 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">//GEN-BEGIN:initComponents
    private void initComponents() {

        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        nilai1 = new javax.swing.JTextField();
        jLabel3 = new javax.swing.JLabel();
        nilai2 = new javax.swing.JTextField();
        jLabel4 = new javax.swing.JLabel();
        jumlah = new javax.swing.JLabel();
        operator = new javax.swing.JComboBox();
        hitung = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setText("HITUNG SEDERHANA");//Judul pada Dekstop yaitu HITUNG SEDERHANA//

        jLabel2.setText("Nilai 1 : ");//Pada barisan ini ubah jlabel2 menjadi Nilai 1 dan memasukkan kan nilai pertama//

        nilai1.setText("0");

        jLabel3.setText("Nilai 2 : ");");//Pada baris ini ubah jlabel3 menjadi Nilai 2 dan memasukkan nilai kedua//

        nilai2.setText("0");

        jLabel4.setText("Jumlah");// Pada baris ini ubah jlabel3 menjadi Jumlah //

        jumlah.setFont(new java.awt.Font("Dialog", 1, 14)); // NOI18N
        jumlah.setForeground(new java.awt.Color(255, 0, 0));
        jumlah.setText("0");

        operator.setFont(new java.awt.Font("Dialog", 1, 14)); // NOI18N
        operator.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "+", "-", "*", "/" }));

        hitung.setText("Hitung");//untuk menghitung operator aritmatika//
        hitung.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                hitungActionPerformed(evt);
            }
        });

        jButton2.setText("Kosongkan");//jbutton2 diubah menjadi Kosongkan//
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jButton3.setText("Keluar");//jbutton2 diubah menjadi Keluar//
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(operator, 0, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addGap(0, 68, Short.MAX_VALUE)
                        .addComponent(jLabel1)
                        .addGap(0, 68, Short.MAX_VALUE))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(nilai1))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel3)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                        .addComponent(nilai2))
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel4)
                        .addGap(18, 18, 18)
                        .addComponent(jumlah, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
                .addContainerGap())
            .addGroup(layout.createSequentialGroup()
                .addComponent(hitung)
                .addGap(18, 18, 18)
                .addComponent(jButton2)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(jButton3)
                .addGap(0, 0, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(21, 21, 21)
                .addComponent(jLabel1)
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel2)
                    .addComponent(nilai1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel3)
                    .addComponent(nilai2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel4)
                    .addComponent(jumlah, javax.swing.GroupLayout.PREFERRED_SIZE, 24, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addComponent(operator, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(hitung)
                    .addComponent(jButton2)
                    .addComponent(jButton3))
                .addContainerGap(64, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>//GEN-END:initComponents

    private void hitungActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_hitungActionPerformed
        int n1=0,n2=0,j=0;// menggunakan tipe data integer//
        n1=Integer.valueOf(nilai1.getText());
        n2=Integer.valueOf(nilai2.getText());
        String op=operator.getSelectedItem().toString();
// jumlah.setText(operator.getSelectedItem().toString());
        if(op=="+"){// memakai percabangan"Of"//
            j=n1+n2;//Operator aritmatika untuk penjumlahan//
        }else if(op=="-"){
            j=n1-n2;//Operator aritmatika untuk pengurangan//
        }else if(op=="*") {
            j=n1*n2;//Operator aritmetika untuk perkalian//
        }else{
            j=n1/n2;//Operator aritmatika untuk pembagian//
        }
        jumlah.setText(String.valueOf(j));
        // TODO add your handling code here:
    }//GEN-LAST:event_hitungActionPerformed

    private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton3ActionPerformed
        System.exit(WIDTH);
        // TODO add your handling code here:
    }//GEN-LAST:event_jButton3ActionPerformed

    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton2ActionPerformed
        nilai1.setText("0");
        nilai2.setText("0");
        jumlah.setText("0");
        operator.setSelectedIndex(0);
        // TODO add your handling code here:
    }//GEN-LAST:event_jButton2ActionPerformed

    /**
     * @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(Game.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Game.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Game.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Game.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 Game().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton hitung;
    private javax.swing.JButton jButton2;
    private javax.swing.JButton jButton3;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jumlah;
    private javax.swing.JTextField nilai1;
    private javax.swing.JTextField nilai2;
    private javax.swing.JComboBox operator;
    // End of variables declaration//GEN-END:variables
}
 Demikianlah penjelasan saya tentang kodingan kalkulator ini, Semoga bermanfaat.. 

Assalamualaikum Warahmatullahi Wabarakaaatuuh


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