public Calculator(String s)
    {
        super(s);
        setBackground(Color.black);
        GridLayout gl = new GridLayout(4, 4, 5, 5);    
        setLayout(gl);
        StringTokenizer st = new StringTokenizer
        ("7 8 9 / 4 5 6 * 1 2 3 - 0 . = +");
        MenuBar mb = new MenuBar();
                setMenuBar(mb);
                Menu mFile = new Menu("Файл");
                mb.add(mFile);
        while(st.hasMoreTokens())
        {
            Button tempSymbol = new Button(st.nextToken());            
            add(tempSymbol);
        }
        setSize(200, 200);
        setVisible(true);
    }