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

class MiniCalc extends JFrame
{
    public static void main(String[] args)
    {
        MiniCalc program = new MiniCalc();
        program.run();
    }
    public void run()
    {
        setTitle("MiniCalc");        
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        Container pane = new Container();
        Box screen = new Box(BoxLayout.Y_AXIS);
        Box box = new Box(BoxLayout.X_AXIS);
        JTextField newnumber = new JTextField(20);        
        JTextField currentnumber = new JTextField(20);
        DoMath listener = new DoMath(currentnumber,newnumber);                
        AddString listener2 = new AddString(newnumber);
        box.add(new JLabel("Result"));
        box.add(currentnumber);        
        currentnumber.setText("0");
        box.add(new JLabel("NewNumber"));
        box.add(newnumber);
        pane.setLayout(new GridLayout(4,4));
        JButton b11 = button2("7", listener2, pane);
        JButton b12 = button2("8", listener2, pane);
        JButton b13 = button2("9", listener2, pane);                
        JButton b1 = button("Add", listener, pane);         
        JButton b8 = button2("4", listener2, pane);
        JButton b9 = button2("5", listener2, pane);
        JButton b10 = button2("6", listener2, pane);
        JButton b2 = button("Subtract", listener, pane);
        JButton b5 = button2("1", listener2, pane);
        JButton b6 = button2("2", listener2, pane);
        JButton b7 = button2("3", listener2, pane);
        JButton b3 = button("Multiply", listener, pane);
        JButton b14 = button2("0", listener2, pane);
        JButton b15 = button2(".", listener2, pane);
        JButton b16 = button("=", listener, pane);
        JButton b4 = button("Divide", listener, pane);
        screen.add(box);
        screen.add(pane);
        add(screen);        
        pack();
        setVisible(true);
    }
    JButton button(String text, DoMath listener,Container pane)
    {
        JButton b = new JButton(text);
        b.addActionListener(listener);
        pane.add(b);
        return b;
    }
    JButton button2(String text, AddString listener, Container pane)
    {
        JButton b = new JButton(text);
        b.addActionListener(listener);
        pane.add(b);
        return b;
    }
}