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clear.setForeground(Color.blue);                          
      b0.setForeground(Color.blue);
      b1.setForeground( Color.blue);
      b2.setForeground( Color.blue);
      b3.setForeground( Color.blue);
      b4.setForeground( Color.blue);
      b5.setForeground( Color.blue);
      b6.setForeground( Color.blue);
      b7.setForeground( Color.blue);
      b8.setForeground( Color.blue);
      b9.setForeground( Color.blue);
      a.setForeground( Color.blue);
      b.setForeground( Color.blue);
      c.setForeground( Color.blue);
      d.setForeground( Color.blue);
      e.setForeground( Color.blue);
      f.setForeground( Color.blue);
      dian.setForeground( Color.blue);
      
      
                clear.addActionListener(this);
                jia.addActionListener(this);
                jian.addActionListener(this);
                cheng.addActionListener(this);
                chu.addActionListener(this);
                deng.addActionListener(this);
                dian.addActionListener(this);
                sqr.addActionListener(this);
                mee.addActionListener(this);                                
     cheng.setForeground(Color.red);
     chu.setForeground(Color.red);
     jia.setForeground(Color.red);
     jian.setForeground(Color.red);
     deng.setForeground(Color.black);
     sqr.setForeground(Color.red);
     mee.setForeground(Color.red);
                                
                ox.addItemListener(new checkbox(2));
                bx.addItemListener(new checkbox(8));
                dx.addItemListener(new checkbox(10));
                hex.addItemListener(new checkbox(16));
                    
                       ButtonGroup tk=new ButtonGroup();
                        tk.add(ox);
                        tk.add(bx);
                        tk.add(dx);
                        tk.add(hex);
                
         ox.setForeground(Color.black);
         bx.setForeground(Color.black);
         dx.setForeground(Color.black);
         hex.setForeground(Color.black);                pack();show();