import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;

public class Calculator
extends JFrame
implements ActionListener
{
private JLabel label1;
private JLabel label2;
private JLabel label3;
private JLabel label4;
private JTextField textfield1;
private JTextField textfield2;
private JTextField textfield3;
private JButton boton1;
private JButton boton2;
private JButton boton3;
private JButton boton4;
private JButton boton5;
private JButton boton6;

public Calculator()
{
setLayout(null);
this.label1 = new JLabel("Calculatorul lui Man :)");
this.label1.setBounds(80, 20, 200, 20);
add(this.label1);


this.label2 = new JLabel("X=");
this.label2.setBounds(10, 60, 50, 20);
add(this.label2);

this.label3 = new JLabel("Y=");
this.label3.setBounds(150, 60, 50, 20);
add(this.label3);

this.label4 = new JLabel("Rezultat ==> ");
this.label4.setBounds(10, 150, 80, 20);
add(this.label4);


this.textfield3 = new JTextField();
this.textfield3.setBounds(120, 150, 100, 30);
this.textfield3.setBackground(Color.lightGray);
add(this.textfield3);

this.textfield1 = new JTextField();
this.textfield1.setBounds(30, 60, 100, 30);
add(this.textfield1);

this.textfield2 = new JTextField();
this.textfield2.setBounds(170, 60, 100, 30);
add(this.textfield2);

this.boton1 = new JButton("+");
this.boton1.setBounds(30, 200, 50, 30);
add(this.boton1);
this.boton1.addActionListener(this);

this.boton2 = new JButton("-");
this.boton2.setBounds(90, 200, 50, 30);
add(this.boton2);
this.boton2.addActionListener(this);

this.boton3 = new JButton("*");
this.boton3.setBounds(150, 200, 50, 30);
add(this.boton3);
this.boton3.addActionListener(this);


this.boton4 = new JButton("/");
this.boton4.setBounds(210, 200, 50, 30);
add(this.boton4);
this.boton4.addActionListener(this);

this.boton5 = new JButton("Repeta");
this.boton5.setBounds(30, 250, 100, 30);
add(this.boton5);
this.boton5.addActionListener(this);

this.boton6 = new JButton("Iesire");
this.boton6.setBounds(160, 250, 100, 30);
add(this.boton6);
this.boton6.addActionListener(this);

setTitle("Calculator 4 operatii(+ - * /)");
}

public void actionPerformed(ActionEvent e)
{
if (e.getSource() == this.boton6) {
System.exit(0);
}
double rezultat = 0.0D;
String cad1 = this.textfield1.getText();
String cad2 = this.textfield2.getText();
double x = Double.parseDouble(cad1);
double y = Double.parseDouble(cad2);
if (e.getSource() == this.boton1)
{
rezultat = x + y;
this.textfield3.setText(String.valueOf(rezultat));
}
else if (e.getSource() == this.boton2)
{
rezultat = x - y;
this.textfield3.setText(String.valueOf(rezultat));
}
else if (e.getSource() == this.boton3)
{
rezultat = x * y;
this.textfield3.setText(String.valueOf(rezultat));
}
else if (e.getSource() == this.boton4)
{
if (y == 0.0D)
{
setTitle("===>> Erroare !");
}
else
{
rezultat = x / y;
this.textfield3.setText(String.valueOf(rezultat));
}
}
else if (e.getSource() == this.boton5)
{
this.textfield1.setText(" ");
this.textfield2.setText(" ");
this.textfield3.setText(" ");
}
}

public static void main(String[] ar)
{
Calculator formulario1 = new Calculator();
formulario1.setBounds(0, 0, 300, 350);
formulario1.setVisible(true);
}
}