Program Sederhana Membuat Kalkulator Menggunakan Program Java

Semoga Bermanfaat

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.FlowLayout.*;
import java.awt.Container.*;
public class calculator extends JFrame implements ActionListener
{
private JTextField jTFInput1,jTFInput2,jTFHasil;
private JButton btnkali,btntambah,btnkurang,btnbagi;
public static void main (String args [])
{
calculator frame = new calculator ();
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Calculator");
frame.setVisible(true);
frame.setSize(550,150);
}

public calculator()
{
JPanel p1 =new JPanel();
p1.setLayout(new GridLayout (4, 1));
p1.add(new JLabel ("Bilangan 1"));
p1.add(jTFInput1=new JTextField(3));
p1.add(new JLabel ("Bilangan2"));
p1.add(jTFInput2 = new JTextField(3));
p1.add(new JLabel ("Hasil"));
p1.add(jTFHasil =new JTextField(4));
jTFHasil.setEditable(false);
JPanel p2 = new JPanel();

p2.setLayout(new FlowLayout());
p2.add(btnkali = new JButton ("*"));
btnkali.addActionListener(this);
JPanel p3 = new JPanel();
p3.setLayout(new FlowLayout());
p3.add(btntambah = new JButton (" + "));
btntambah.addActionListener(this);
JPanel p4 =new JPanel();
p4.setLayout(new FlowLayout());
p4.add(btnkurang=new JButton (" - " ));
btnkurang.addActionListener(this);
JPanel p5 =new JPanel();
p5.setLayout(new FlowLayout());
p5.add(btnbagi=new JButton (" / " ));
btnbagi.addActionListener(this);
Container container1 = getContentPane();
container1.setLayout(new BorderLayout (150,10));
container1.add(p1);
Container container = getContentPane();
container.setLayout(new
FlowLayout(FlowLayout.LEFT,40,10));
container.add(p2);
container.add(p3);
container.add(p4);
container.add(p5);
}
public void actionPerformed(ActionEvent e)
{
if (e.getSource()==btnkali)
{
double
bilangan1=(Double.parseDouble(jTFInput1.getText().trim()));
double
bilangan2=(Double.parseDouble(jTFInput2.getText().trim()));
double hasil = bilangan1 * bilangan2;
jTFHasil.setText(String.valueOf(hasil));
}
else
if (e.getSource()==btntambah)
{
double
bilangan1=(Double.parseDouble(jTFInput1.getText().trim()));
double
bilangan2=(Double.parseDouble(jTFInput2.getText().trim()));
double hasil=bilangan1 + bilangan2;
jTFHasil.setText(String.valueOf (hasil));
}
else
if (e.getSource()==btnkurang)
{
double
bilangan1=(Double.parseDouble(jTFInput1.getText().trim()));
double
bilangan2=(Double.parseDouble(jTFInput2.getText().trim()));
double hasil=bilangan1 - bilangan2;
jTFHasil.setText(String.valueOf(hasil));
}
else
{
double
bilangan1=(Double.parseDouble(jTFInput1.getText().trim()));
double
bilangan2=(Double.parseDouble(jTFInput2.getText().trim()));
double hasil=bilangan1 / bilangan2;
jTFHasil.setText(String.valueOf(hasil));
}
}
}

Sumber : Tugas Saya