1. hitungduabilangan
importjavax.swing.*;
importjava.awt.*;
importjava.awt.event.*;
public class hitungduabilangan extends JFrame implements ActionListener
{
JTextFieldtxtA,txtB,txthasil;
JPanel panel= new JPanel();
JLabelA,B,hasil;
JButtontambah,bagi,kali,kurang;
publichitungduabilangan()
{
setTitle("HitungDuaBilangan");
setSize(250,400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
A = new JLabel("Nilai A:");
txtA = new JTextField(10);
B = new JLabel("Nilai B:");
txtB = new JTextField(10);
hasil = new JLabel("HasilPerhitungan");
txthasil = new JTextField(10);
tambah = new JButton("+");
tambah.addActionListener(this);

2. bagi = new JButton("/");
bagi.addActionListener(this);
kali = new JButton("X");
kali.addActionListener(this);
kurang = new JButton("-");
kurang.addActionListener(this);
A.setBounds(30,40,100,25);
txtA.setBounds(100,40,80,25);
B.setBounds(30,100,250,25);
txtB.setBounds(100,100,80,25);
hasil.setBounds(50,150,150,25);
txthasil.setBounds(50,170,150,25);
tambah.setBounds(75,200,90,25);
bagi.setBounds(75,230,90,25);
kali.setBounds(75,260,90,25);
kurang.setBounds(75,290,90,25);
panel.add(A);
panel.add(txtA);
panel.add(B);

3. panel.add(txtB);
panel.add(hasil);
panel.add(txthasil);
panel.add(tambah);
panel.add(bagi);
panel.add(kali);
panel.add(kurang);
add(panel);
panel.setLayout(null);
setVisible(true);
}
public static void main(String[]args)
{
newhitungduabilangan();
}
public void actionPerformed(ActionEvent e)
{
String d1 = txtA.getText();
String d2 = txtB.getText();
double a = Integer.parseInt(d1);
double b = Integer.parseInt(d2);
inthasiljml = (int)(a+b);
inthasilbagi = (int)(a/b);
inthasilkali = (int)(a*b);
inthasilkurang = (int)(a-b);
Object objek = e.getSource();

4. if(objek==tambah)
txthasil.setText(new String().valueOf(hasiljml));
{
if (objek==bagi)
txthasil.setText(new String().valueOf(hasilbagi));
}
{
if (objek==kali)
txthasil.setText(new String().valueOf(hasilkali));
}
{
if (objek==kurang)
txthasil.setText(new String().valueOf(hasilkurang));
}} }