MEMBUAT KALKULATOR MENGGUNAKAN ECLIPSE

Kali ini saya akan memposting aplikasi kalkulator dengan menggunakan eclipse dan bahasa pemrograman java.

1.pertama buat sebuah projek
2.membuat class dengan program utamanya ini sourcodenya:
import java.awt.FlowLayout;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;


public class calculator_ui implements ActionListener {

JFrame frame = new JFrame("Calculator");
JPanel panel = new JPanel(new FlowLayout());

JTextArea text = new JTextArea(1,20);
JButton but1 = new JButton("1");
JButton but2 = new JButton("2");
JButton but3 = new JButton("3");
JButton but4 = new JButton("4");
JButton but5 = new JButton("5");
JButton but6 = new JButton("6");
JButton but7 = new JButton("7");
JButton but8 = new JButton("8");
JButton but9 = new JButton("9");
JButton but0 = new JButton("0");

JButton butadd = new JButton("+");
JButton butmulti = new JButton("*");
JButton butsub = new JButton("-");
JButton butdiv = new JButton("/");
JButton buteq = new JButton("=");

JButton butclear = new JButton("C");

Double number1,number2,result;
int addc=0,subc=0,multic=0,divc=0;


public void ui()
{
frame.setVisible(true);
frame.setSize(250,200);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.add(panel);

panel.add(text);

panel.add(but1);
panel.add(but2);
panel.add(but3);
panel.add(but4);
panel.add(but5);
panel.add(but6);
panel.add(but7);
panel.add(but8);
panel.add(but9);
panel.add(but0);

panel.add(butadd);
panel.add(butsub);
panel.add(butmulti);
panel.add(butdiv);
panel.add(buteq);
panel.add(butclear);

but1.addActionListener(this);
but2.addActionListener(this);
but3.addActionListener(this);
but4.addActionListener(this);
but5.addActionListener(this);
but6.addActionListener(this);
but7.addActionListener(this);
but8.addActionListener(this);
but9.addActionListener(this);
but0.addActionListener(this);
butadd.addActionListener(this);
butsub.addActionListener(this);
butmulti.addActionListener(this);
butdiv.addActionListener(this);
buteq.addActionListener(this);
butclear.addActionListener(this);
}

public void actionPerformed(ActionEvent e){



Object source = e.getSource();


if(source==butclear)
{
number1=0.0;
number2=0.0;
text.setText("");

}

if(source==but1)
{
text.append("1");
}

if(source==but2)
{
text.append("2");
}

if(source==but3)
{
text.append("3");
}

if(source==but4)
{
text.append("4");
}

if(source==but4)
{
text.append("4");
}

if(source==but5)
{
text.append("5");
}

if(source==but6)
{
text.append("6");
}

if(source==but7)
{
text.append("7");
}

if(source==but8)
{
text.append("8");
}

if(source==but9)
{
text.append("9");
}

if(source==but0)
{
text.append("0");
}
if(source==butadd)
{
number1=number_reader();
text.setText("");
addc=1;
subc=0;
multic=0;
divc=0;
}
if(source==butsub)
{
number1=number_reader();
text.setText("");
addc=0;
subc=1;
multic=0;
divc=0;
}
if(source==butmulti)
{
number1=number_reader();
text.setText("");
addc=0;
subc=0;
multic=1;
divc=0;
}
if(source==butdiv)
{
number1=number_reader();
text.setText("");
addc=0;
subc=0;
multic=0;
divc=1;
}

if(source==buteq)
{
number2=number_reader();
if(addc>0)
{
result=number1+number2;
text.setText(Double.toString(result));
}
if(subc>0)
{
result=number1-number2;
text.setText(Double.toString(result));
}
if(multic>0)
{
result=number1*number2;
text.setText(Double.toString(result));
}
if(divc>0)
{
result=number1/number2;
text.setText(Double.toString(result));
}

}
}

public double number_reader()
{
Double num1;
String s;
s=text.getText();
num1=Double.valueOf(s);

return num1;
}
}
ini screen shoot saat di eclipse

3.Buat class main
contoh source code
public class main extends calculator_ui{

public static void main(String[] args) {
calculator_ui n = new calculator_ui();
n.ui();
}

}

contoh dalam eclipse

dan akan menjadi seperti di bawah ini