calc

import javax.swing.*;
import java.awt.*;

public class Calculator{
    JPanel windowContent;

    JFormattedTextField displayFormattedField;

    JButton[] button = new JButton[10];

    JButton buttonPoint;
    JButton buttonEqual;
    JButton buttonPlus;
    JButton buttonMinus;
    JButton buttonDelenie;
    JButton buttonUmnojenie;
    JPanel p2;
    JPanel p1;
    Calculator(){
        windowContent = new JPanel();

        BorderLayout bl = new BorderLayout();
        windowContent.setLayout(bl);

        displayFormattedField = new JFormattedTextField();
        displayFormattedField.setHorizontalAlignment(SwingConstants.RIGHT);
        windowContent.add("North", displayFormattedField);

        for (int i=0; i<10; i++) {
            button[i] = new JButton(""+i);

        }

        buttonPoint = new JButton(".");
        buttonEqual = new JButton("=");
        buttonDelenie = new JButton("/");
        buttonMinus = new JButton("-");
        buttonUmnojenie = new JButton("*");
        buttonPlus = new JButton("+");

        p1 = new JPanel();
        GridLayout gl = new GridLayout(4,3);
        p1.setLayout(gl);

        for (int i=0; i<10; i++) {
            p1.add(button[i]);
        }
        p1.add(button[0]);

        p1.add(buttonPoint);
        p1.add(buttonEqual);

        p2 = new JPanel();
        GridLayout gl2 = new GridLayout(4,1);
        p2.setLayout(gl2);

        p2.add(buttonPlus);
        p2.add(buttonMinus);
        p2.add(buttonUmnojenie);
        p2.add(buttonDelenie);

        windowContent.add("Center",p1);
        windowContent.add("East", p2);

        JFrame frame = new JFrame("Calculator");
        frame.setContentPane(windowContent);

        frame.pack();

        frame.setVisible(true);
    }
    public static void main(String[] args) {
        Calculator calc = new Calculator();
    }

}