calculator

import java.awt.*;import java.awt.event.*; class RadioCalci extends Frame implements ItemListener{  Label l1,l2,l3;  TextField t1,t2,t3;  Checkbox c1,c2,c3,c4,c5,c6;  CheckboxGroup cbg;   public RadioCalci()  {    //Super(new Frame(),”RadioCalci”);    setLayout(new FlowLayout());    setSize(300,300);