Bikin Kalkulator melalui "netbeans IDE"

Bagi kalian yang merasa sulit untuk membuat suatu program melalui netbeans,saya akan memberikan sedikit "contekan" untuk membuat program kalkulator dari netbeans...
akan lebih baik jika kita saling berbagi dalam "mencari ilmu dan mengamalkannya"
saya tidak memberikan contoh gambarnya,karena kebijakan privasi sudah terlalu mendalam di beberkan ke media massa.

berikut adalah contoh dalam bentuk source nya :

class GUI extends javax.swing.JFrame {

/** Bikin form GUI */
public GUI() {
initComponents();
tf.setText("0");
}

// Method ini dipanggil untuk menginisialisasi form

private void initComponents() {
tf = new javax.swing.JTextField();
bC = new javax.swing.JButton();
b7 = new javax.swing.JButton();
b8 = new javax.swing.JButton();
b9 = new javax.swing.JButton();
b4 = new javax.swing.JButton();
b5 = new javax.swing.JButton();
b6 = new javax.swing.JButton();
b1 = new javax.swing.JButton();
b2 = new javax.swing.JButton();
b3 = new javax.swing.JButton();
bBagi = new javax.swing.JButton();
bKali = new javax.swing.JButton();
bMin = new javax.swing.JButton();
bAdd = new javax.swing.JButton();
b0 = new javax.swing.JButton();
bEqual = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
tf.setEditable(false);

bC.setText("C");
bC.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bCActionPerformed(evt);
}
});

b7.setText("7");
b7.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b7ActionPerformed(evt);
}
});

b8.setText("8");
b8.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b8ActionPerformed(evt);
}
});

b9.setText("9");
b9.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b9ActionPerformed(evt);
}
});

b4.setText("4");
b4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b4ActionPerformed(evt);
}
});

b5.setText("5");
b5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b5ActionPerformed(evt);
}
});

b6.setText("6");
b6.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b6ActionPerformed(evt);
}
});

b1.setText("1");
b1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b1ActionPerformed(evt);
}
});

b2.setText("2");
b2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b2ActionPerformed(evt);
}
});

b3.setText("3");
b3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b3ActionPerformed(evt);
}
});

bBagi.setText("/");
bBagi.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bBagiActionPerformed(evt);
}
});

bKali.setText("x");
bKali.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bKaliActionPerformed(evt);
}
});

bMin.setText("-");
bMin.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bMinActionPerformed(evt);
}
});

bAdd.setText("+");
bAdd.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bAddActionPerformed(evt);
}
});

b0.setText("0");
b0.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
b0ActionPerformed(evt);
}
});

bEqual.setText("=");
bEqual.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
bEqualActionPerformed(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(tf, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(b7)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(b8)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(b9)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(bBagi, javax.swing.GroupLayout.DEFAULT_SIZE, 41, Short.MAX_VALUE)
.addComponent(bC)))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addGroup(layout.createSequentialGroup()
.addComponent(b0)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(bEqual, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addComponent(b1)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(b2)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(b3)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(bAdd, javax.swing.GroupLayout.DEFAULT_SIZE, 41, Short.MAX_VALUE)
.addComponent(bMin, javax.swing.GroupLayout.DEFAULT_SIZE, 41, Short.MAX_VALUE)))
.addGroup(layout.createSequentialGroup()
.addComponent(b4)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(b5)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(b6)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(bKali, javax.swing.GroupLayout.DEFAULT_SIZE, 41, Short.MAX_VALUE)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(tf, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(bC)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(b7)
.addComponent(b8)
.addComponent(b9)
.addComponent(bBagi))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(b4)
.addComponent(b5)
.addComponent(b6)
.addComponent(bKali))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(b1)
.addComponent(b2)
.addComponent(b3)
.addComponent(bMin))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(b0)
.addComponent(bEqual)
.addComponent(bAdd))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}

// method untuk menangani event tombol '=' ketika di klik
private void bEqualActionPerformed(java.awt.event.ActionEvent evt){
inp=Double.parseDouble(tf.getText());
total=proses(inp,operator,total);
tf.setText(""+total);
input="";
operator="";
}

// method untuk menangani event tombol '/' ketika di klik
private void bBagiActionPerformed(java.awt.event.ActionEvent evt) {
inp=Double.parseDouble(tf.getText());
if(operator.equals(""))
{
operator="/";
total=inp;
}
else
{
total=proses(inp,operator,total);
operator="/";
}
tf.setText(""+total);
input="";
}

// method untuk menangani event tombol 'x' ketika di klik
private void bKaliActionPerformed(java.awt.event.ActionEvent evt) {
inp=Double.parseDouble(tf.getText());
if(operator.equals(""))
{
operator="*";
total=inp;
}
else
{
total=proses(inp,operator,total);
operator="*";
}
tf.setText(""+total);
input="";
}

// method untuk menangani event tombol '-' ketika di klik
private void bMinActionPerformed(java.awt.event.ActionEvent evt) {
inp=Double.parseDouble(tf.getText());
if(operator.equals(""))
{
operator="-";
total=inp;
}
else
{
total=proses(inp,operator,total);
operator="-";
}
tf.setText(""+total);
input="";
}

// method untuk menangani event tombol '+' ketika di klik
private void bAddActionPerformed(java.awt.event.ActionEvent evt) {
inp=Double.parseDouble(tf.getText());
if(operator.equals(""))
{
operator="+";
total=inp;
}
else
{
total=proses(inp,operator,total);
operator="+";
}
tf.setText(""+total);
input="";
}


// method untuk menangani event tombol '0-9' ketika di klik
private void b0ActionPerformed(java.awt.event.ActionEvent evt) {
input=input+"0";
tf.setText(input);
}

private void b3ActionPerformed(java.awt.event.ActionEvent evt) {
input=input+"3";
tf.setText(input);
}

private void b2ActionPerformed(java.awt.event.ActionEvent evt) {
input=input+"2";
tf.setText(input);
}

private void b1ActionPerformed(java.awt.event.ActionEvent evt) {
input=input+"1";
tf.setText(input);
}

private void b6ActionPerformed(java.awt.event.ActionEvent evt) {
input=input+"6";
tf.setText(input);
}
private void b5ActionPerformed(java.awt.event.ActionEvent evt) {
input=input+"5";
tf.setText(input);
}

private void b4ActionPerformed(java.awt.event.ActionEvent evt) {
input=input+"4";
tf.setText(input);
}

private void b9ActionPerformed(java.awt.event.ActionEvent evt) {
input=input+"9";
tf.setText(input);
}

private void b8ActionPerformed(java.awt.event.ActionEvent evt) {
input=input+"8";
tf.setText(input);
}

private void b7ActionPerformed(java.awt.event.ActionEvent evt) {
input=input+"7";
tf.setText(input);
}

private void bCActionPerformed(java.awt.event.ActionEvent evt) {
tf.setText("0");
operator="";
total=0;
}

/**
* @param args the command line arguments
*/
public double proses(double input,String operator,double total)
{
double jum=0;
if(operator.equals("+"))
jum=total+input;
else if(operator.equals("-"))
jum=total-input;
else if(operator.equals("*"))
jum=total*input;
else if(operator.equals("/"))
jum=total/input;
return jum;
}

// Variables declaration - do not modify//
private javax.swing.JButton b0;
private javax.swing.JButton b1;
private javax.swing.JButton b2;
private javax.swing.JButton b3;
private javax.swing.JButton b4;
private javax.swing.JButton b5;
private javax.swing.JButton b6;
private javax.swing.JButton b7;
private javax.swing.JButton b8;
private javax.swing.JButton b9;
private javax.swing.JButton bAdd;
private javax.swing.JButton bBagi;
private javax.swing.JButton bC;
private javax.swing.JButton bEqual;
private javax.swing.JButton bKali;
private javax.swing.JButton bMin;
private javax.swing.JTextField tf;

String input="";
String operator="";
double inp;
double total=0;
}

public class Utama {

/** Creates a new instance of Utama */
public Utama() {
}

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new GUI().setVisible(true);
}
});
} // TODO code application logic here


}

made by :
Nur Zuhri Maulana a.k.a Ujie