import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.TextComponent.*;
import java.awt.event.TextListener.*;
class LabelExample {
    public static void main(String args[]) {

        Frame f = new Frame("Calculator");
        f.setSize(400, 450);
        Button b1 = new Button("1");
        Button b2 = new Button("2");
        Button b3 = new Button("3");
        Button b4 = new Button("4");
        Button b5 = new Button("5");
        Button b6 = new Button("6");
        Button b7 = new Button("7");
        Button b8 = new Button("8");
        Button b9 = new Button("9");
        Button plus = new Button("+");
        //Button minus = new Button("-");
        plus.setBounds(70, 345, 70, 50);
        f.add(plus);
        //  minus.setBounds(270, 345, 70, 50);
        //  f.add(minus);
        b1.setBounds(70, 105, 70, 50);
        f.add(b1);
        b2.setBounds(170, 105, 70, 50);
        f.add(b2);
        b3.setBounds(270, 105, 70, 50);
        f.add(b3);
        b4.setBounds(70, 185, 70, 50);
        f.add(b4);
        b5.setBounds(170, 185, 70, 50);
        f.add(b5);
        b6.setBounds(270, 185, 70, 50);
        f.add(b6);
        b7.setBounds(70, 265, 70, 50);
        f.add(b7);
        b8.setBounds(170, 265, 70, 50);
        f.add(b8);
        b9.setBounds(270, 265, 70, 50);
        f.add(b9);
        Button ednakvo = new Button("=");
        ednakvo.setBounds(170, 345, 70, 50);
        f.add(ednakvo);
        TextField t1, t2;
        t2 = new TextField();
        t2.setText("0");
        t2.setVisible(false);
        t1 = new TextField();
        t1.setBounds(70, 50, 270, 25);
        f.add(t1);
        t2.setBounds(70, 150, 70, 25);
        f.add(t2);
        b1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String a = t1.getText();
                t1.setText(a + "1");
            }
        });
        b2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String a = t1.getText();
                t1.setText(a + "2");
            }
        });
        b3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String a = t1.getText();
                t1.setText(a + "3");
            }
        });
        b4.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String a = t1.getText();
                t1.setText(a + "4");
            }
        });
        b5.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String a = t1.getText();
                t1.setText(a + "5");
            }
        });
        b6.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String a = t1.getText();
                t1.setText(a + "7");
            }
        });
        b7.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String a = t1.getText();
                t1.setText(a + "7");
            }
        });
        b8.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String a = t1.getText();
                t1.setText(a + "8");
            }
        });
        b9.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String a = t1.getText();
                t1.setText(a + "9");
            }
        });

        plus.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String a = t1.getText();
                t1.setText("");
                int a1 = Integer.parseInt(a);
                String b = t2.getText();
                int b1 = Integer.parseInt(b);
                int c1 = a1 + b1;
                String c = Integer.toString(c1);
                t2.setText(c);


            }
        });
        ednakvo.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String a = t1.getText();
                int a1 = Integer.parseInt(a);
                String b = t2.getText();
                int b1 = Integer.parseInt(b);
                int c1 = a1 + b1;
                String c = Integer.toString(c1);
                t1.setText(c);
                t2.setText("0");

            }
        });
        f.setLayout(null);
        f.setVisible(true);
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                System.exit(0);
            }
        });

    }
}