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

class TestKeypad {

  public static void main(String[] args){

    JFrame frame = new JFrame();
    frame.setTitle("A keypad");
    Container pane = frame.getContentPane();


    Button[] keys;
    Button CLR;
    int value;
    final int KEYS = 10;
    Label[] display;
    final int DISPLAYS = 10;

    Panel d,k;

    d = new Panel(new GridLayout(1,DISPLAYS));
    display = new Label[DISPLAYS];

    for(int i = 0;i<DISPLAYS; i++)
      display[i] = setupLabel("0",d);
    pane.add(d,BorderLayout.NORTH);

    k = new Panel(new GridLayout(4,3));
    keys = new Button[KEYS];
    for(int i = 0; i<KEYS; i++)
      keys[i] = setupButton(i+"",k);
    keys[0] = setupButton("0",k);
    CLR = setupButton("CLR",k);
    pane.add(k,BorderLayout.CENTER);




    frame.show();

  }

  public static Label setupLabel(String s,Container c){
    Label l = new Label(s,Label.CENTER);

    l.setFont(new Font("Sansserif",Font.PLAIN,18));
    l.setBackground(Color.white);
    c.add(l);
    return l;
  }

  public static Button setupButton(String s, Container c){
    Button b = new Button(s);
    b.setFont(new Font("Sansserif",Font.PLAIN,18));
    b.setBackground(Color.white);
    c.add(b);
      return b;
  }

}