Turorial Pembuatan Kalkulator Java pada Aplikasi Eclipse
Pada kesempatan kali ini saya akan menjelaskan pembuatan kalkulator menggunakan bahasa pemrograman Java pada aplikasi Eclipse. Berikut tutorialnya:
1. Buka aplikasi Eclipse.
2. Buat project Java baru dengan nama "Calculator".
3. Buat Class baru pada project Calculator dengan nama "calculatorDesign" dengan package "Calculator".
4. Pada class calculatorDesign, isikan source code berikut:
package Calculator;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
public class calculatorDesign implements ActionListener {
JFrame frame = new JFrame("Calcalutor");
JPanel panel = new JPanel(new FlowLayout());
JTextArea text = new JTextArea(2, 17);
// button number
JButton button1 = new JButton("1");
JButton button2 = new JButton("2");
JButton button3 = new JButton("3");
JButton button4 = new JButton("4");
JButton button5 = new JButton("5");
JButton button6 = new JButton("6");
JButton button7 = new JButton("7");
JButton button8 = new JButton("8");
JButton button9 = new JButton("9");
JButton button0 = new JButton("0");
// button operations
JButton buttonAdd = new JButton("+");
JButton buttonSub = new JButton("-");
JButton buttonMultiply = new JButton("*");
JButton buttonDivide = new JButton("/");
JButton buttonEqual = new JButton("=");
JButton buttonClear = new JButton("C");
int number1, number2, result;
int addc = 0, subc = 0, multic = 0, divc = 0;
public void Design() {
frame.setVisible(true);
frame.setBounds(300, 300, 220, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(panel);
panel.add(text);
panel.add(button7);
panel.add(button8);
panel.add(button9);
panel.add(buttonMultiply);
panel.add(button4);
panel.add(button5);
panel.add(button6);
panel.add(buttonSub);
panel.add(button1);
panel.add(button2);
panel.add(button3);
panel.add(buttonAdd);
panel.add(buttonClear);
panel.add(button0);
panel.add(buttonDivide);
panel.add(buttonEqual);
// action button
button1.addActionListener(this);
button2.addActionListener(this);
button3.addActionListener(this);
button4.addActionListener(this);
button5.addActionListener(this);
button6.addActionListener(this);
button7.addActionListener(this);
button8.addActionListener(this);
button9.addActionListener(this);
button0.addActionListener(this);
buttonAdd.addActionListener(this);
buttonSub.addActionListener(this);
buttonMultiply.addActionListener(this);
buttonDivide.addActionListener(this);
buttonEqual.addActionListener(this);
buttonClear.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source == buttonClear) {
number1 = 0;
number2 = 0;
text.setText("");
}
if (source == button1) {
text.append("1");
}
if (source == button2) {
text.append("2");
}
if (source == button3) {
text.append("3");
}
if (source == button4) {
text.append("4");
}
if (source == button5) {
text.append("5");
}
if (source == button6) {
text.append("6");
}
if (source == button7) {
text.append("7");
}
if (source == button8) {
text.append("8");
}
if (source == button9) {
text.append("9");
}
if (source == button0) {
text.append("0");
}
if (source == buttonAdd) {
number1 = numberReader();
text.setText("");
addc = 1;
subc = 0;
multic = 0;
divc = 0;
}
if (source == buttonSub) {
number1 = numberReader();
text.setText("");
addc = 0;
subc = 1;
multic = 0;
divc = 0;
}
if (source == buttonMultiply) {
number1 = numberReader();
text.setText("");
addc = 0;
subc = 0;
multic = 1;
divc = 0;
}
if (source == buttonDivide) {
number1 = numberReader();
text.setText("");
addc = 0;
subc = 0;
multic = 0;
divc = 1;
}
if (source == buttonEqual) {
number2 = numberReader();
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 int numberReader() {
int number1;
String s;
s = text.getText();
number1 = Integer.parseInt(s);
return number1;
}
}
5. Save class "calculatorDesign".
6. Buat class baru untuk menampilkan calculator dengan nama "calculatorMain". Cecklist pada "public static void main".
7. Pada class "calculatorMain" isikan source code berikut.
package Calculator;
public class calculatorMain extends calculatorDesign{
public static void main(String[] args) {
calculatorDesign Calculator = new calculatorDesign();
Calculator.Design();
}
}
8. Jalankan program dengan perintah "Run", berikut hasilnya:
Selesai, semoga bermanfaat gaess :)
