Notes

package furkan;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class App1 {

double sayi, sonuc = 0;
int op = 0;

public App1() {
JFrame frame = new JFrame("Hesap Makinesi");
frame.setSize(250, 275);
frame.setLayout(new FlowLayout());
JMenuBar menuBar = new JMenuBar();
JMenuItem menu = new JMenuItem("Yardim");
JMenuItem menu1 = new JMenuItem("Hakkinda");

menu.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(frame,
"Hesap Makinesi'ni basit matematiksel işlemler yapmak için kullanabilirsiniz.", "YARDIM",
JOptionPane.PLAIN_MESSAGE);
}
});

menu1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(frame, "Bu program Furkan Ekiz tarafından yazılmıştır");
}
});

menuBar.add(menu);
menuBar.add(menu1);
frame.add(menuBar);
frame.setJMenuBar(menuBar);
BilesenleriEkle(frame.getContentPane());
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

private void BilesenleriEkle(Container contentPane) {

JPanel panel1 = new JPanel();
JPanel panel2 = new JPanel();
panel1.setLayout(new GridLayout(2, 1, 10, 10));
panel2.setLayout(new GridLayout(4, 4, 10, 10));
JTextField field1 = new JTextField(18);
field1.setText("0");
field1.setHorizontalAlignment(SwingConstants.RIGHT);
JTextField field2 = new JTextField(18);
field2.setEditable(false);
field2.setBorder(null);
field2.setHorizontalAlignment(SwingConstants.RIGHT);
JButton button0 = new JButton("0");
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 buttonA = new JButton("+");
JButton buttonE = new JButton("-");
JButton buttonB = new JButton("/");
JButton buttonC = new JButton("*");
JButton buttonH = new JButton("=");
JButton buttonT = new JButton("C");

panel1.add(field2);
panel1.add(field1);

panel2.add(button7);
panel2.add(button8);
panel2.add(button9);
panel2.add(buttonA);

panel2.add(button4);
panel2.add(button5);
panel2.add(button6);
panel2.add(buttonE);

panel2.add(button1);
panel2.add(button2);
panel2.add(button3);
panel2.add(buttonB);

panel2.add(button0);
panel2.add(buttonT);
panel2.add(buttonH);
panel2.add(buttonC);

button7.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (field1.getText().equals("0"))
field1.setText(null);
field1.setText(field1.getText() + 7);
field2.setText(field2.getText() + 7);
}
});

button8.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (field1.getText().equals("0"))
field1.setText(null);
field1.setText(field1.getText() + 8);
field2.setText(field2.getText() + 8);
}
});

button9.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (field1.getText().equals("0"))
field1.setText(null);
field1.setText(field1.getText() + 9);
field2.setText(field2.getText() + 9);
}
});

buttonA.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try {
if (!(field2.getText().endsWith("+") || field2.getText().endsWith("-")
|| field2.getText().endsWith("/") || field2.getText().endsWith("*"))) {
if (op == 2) {

sayi = Double.parseDouble(field1.getText());
sonuc = sonuc - sayi;

field1.setText(null);

} else if (op == 3) {

sayi = Double.parseDouble(field1.getText());
sonuc = sonuc / sayi;

field1.setText(null);

} else if (op == 4) {

sayi = Double.parseDouble(field1.getText());
sonuc = sonuc * sayi;

field1.setText(null);

} else {
sayi = Double.parseDouble(field1.getText());
if (sonuc == 0)
sonuc = sayi;
else
sonuc = sonuc + sayi;

}
field1.setText(null);
field2.setText(field2.getText() + "+");
}
} catch (NumberFormatException e1) {
field2.setText("Lütfen sayı giriniz");
field1.setText(null);
}
op = 1;
}
});

button4.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (field1.getText().equals("0"))
field1.setText(null);
field1.setText(field1.getText() + 4);
field2.setText(field2.getText() + 4);
}
});

button5.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (field1.getText().equals("0"))
field1.setText(null);
field1.setText(field1.getText() + 5);
field2.setText(field2.getText() + 5);
}
});

button6.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (field1.getText().equals("0"))
field1.setText(null);
field1.setText(field1.getText() + 6);
field2.setText(field2.getText() + 6);
}
});

buttonE.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try{
if (!(field2.getText().endsWith("+") || field2.getText().endsWith("-") || field2.getText().endsWith("/")
|| field2.getText().endsWith("*"))) {
if (op == 1) {

sayi = Double.parseDouble(field1.getText());
sonuc = sonuc + sayi;

field1.setText(null);

} else if (op == 3) {

sayi = Double.parseDouble(field1.getText());
sonuc = sonuc / sayi;

field1.setText(null);

} else if (op == 4) {
sayi = Double.parseDouble(field1.getText());
sonuc = sonuc * sayi;
} else {
sayi = Double.parseDouble(field1.getText());
if (sonuc == 0)
sonuc = sayi;
else
sonuc = sonuc - sayi;
}
field1.setText(null);
field2.setText(field2.getText() + "-");
}
}catch(NumberFormatException e1){
field2.setText("Lütfen sayı giriniz");
field1.setText(null);
}
op = 2;
}
});

button1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (field1.getText().equals("0"))
field1.setText(null);
field1.setText(field1.getText() + 1);
field2.setText(field2.getText() + 1);
}
});

button2.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (field1.getText().equals("0"))
field1.setText(null);
field1.setText(field1.getText() + 2);
field2.setText(field2.getText() + 2);
}
});

button3.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (field1.getText().equals("0"))
field1.setText(null);
field1.setText(field1.getText() + 3);
field2.setText(field2.getText() + 3);
}
});

buttonB.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try{
if (!(field2.getText().endsWith("+") || field2.getText().endsWith("-") || field2.getText().endsWith("/")
|| field2.getText().endsWith("*"))) {
if (op == 1) {
sayi = Double.parseDouble(field1.getText());
sonuc = sonuc + sayi;
} else if (op == 2) {
sayi = Double.parseDouble(field1.getText());
sonuc = sonuc - sayi;
} else if (op == 4) {
sayi = Double.parseDouble(field1.getText());
sonuc = sonuc * sayi;
} else {
sayi = Double.parseDouble(field1.getText());
if (sonuc == 0)
sonuc = sayi;
else
sonuc = sonuc / sayi;
}
field1.setText(null);
field2.setText(field2.getText() + "/");
}
}catch(NumberFormatException e1){
field2.setText("Lütfen sayı giriniz");
field1.setText(null);
}
op = 3;
}
});

button0.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (field1.getText().equals("0"))
field1.setText(null);
field1.setText(field1.getText() + 0);
field2.setText(field2.getText() + 0);
}
});

buttonT.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
field1.setText("0");
field2.setText(null);
}
});

buttonC.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try{
if (!(field2.getText().endsWith("+") || field2.getText().endsWith("-") || field2.getText().endsWith("/")
|| field2.getText().endsWith("*"))) {
if (op == 1) {
sayi = Double.parseDouble(field1.getText());
sonuc = sonuc + sayi;
} else if (op == 2) {
sayi = Double.parseDouble(field1.getText());
sonuc = sonuc - sayi;
} else if (op == 3) {
sayi = Double.parseDouble(field1.getText());
sonuc = sonuc / sayi;
} else {
sayi = Double.parseDouble(field1.getText());
if (sonuc == 0)
sonuc = sayi;
else
sonuc = sonuc * sayi;
}
field1.setText(null);
field2.setText(field2.getText() + "*");
}
}catch(NumberFormatException e1){
field2.setText("Lütfen sayı giriniz");
field1.setText(null);
}
op = 4;
}
});

buttonH.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
try{
if (!(field2.getText().endsWith("+") || field2.getText().endsWith("-") || field2.getText().endsWith("/")
|| field2.getText().endsWith("*"))) {
if (op == 1) {
sayi = Double.parseDouble(field1.getText());
sonuc = sonuc + sayi;
} else if (op == 2) {
sayi = Double.parseDouble(field1.getText());
sonuc = sonuc - sayi;
} else if (op == 3) {
sayi = Double.parseDouble(field1.getText());
sonuc = sonuc / sayi;
} else {
sayi = Double.parseDouble(field1.getText());
sonuc = sonuc * sayi;
}
field1.setText(String.valueOf(sonuc));
field2.setText(field2.getText() + "=" + String.valueOf(sonuc));
sonuc = 0;
}
}catch(NumberFormatException e1){
field2.setText("Lütfen sayı giriniz");
field1.setText(null);
}
}
});

contentPane.add(panel1);
contentPane.add(panel2);
}

public static void main(String[] args) {
new App1();
}
}