11

package Swing2;

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



public class Okno_11 extends JFrame{

    JTextField pole1 = new JTextField(3);
    JTextField pole2 = new JTextField(3);
    JTextField pole3 = new JTextField(5);

    private final String dzail[] = {"+","-","*","/"};
    final DefaultComboBoxModel model = new DefaultComboBoxModel(dzail);
    JComboBox lista = new JComboBox(model);

    JButton b = new JButton("Oblicz!");


    public Okno_11 (){
        super("Zad 11");

        setLayout(new FlowLayout());

        add(pole1);
        add(lista);
        add(pole2);
        add(b);
        add(pole3);

        pole3.setEditable(false);

        Nasluch n = new Nasluch();

        b.addActionListener(n);
        setSize(500,300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);

    }

    class Nasluch implements ActionListener {

        public void actionPerformed(ActionEvent e){
            String a = pole1.getText();
            String b = pole2.getText();
            String c = (String)lista.getSelectedItem();

            if (c == "-")
                pole3.setText((Integer.parseInt(a) - Integer.parseInt(b)) + " ");
            else if (c == "+")
                pole3.setText((Integer.parseInt(a) + Integer.parseInt(b)) + " ");
            else if (c == "*")
                pole3.setText((Integer.parseInt(a) * Integer.parseInt(b)) + " ");
            else if (c == "/")
                pole3.setText((Integer.parseInt(a) / Integer.parseInt(b)) + " ");

        }

    }

    public static void main (String args[]){
        new Okno_11();
    }
}