//save file as Calculator.java and run in cmd/any IDE  
import javax.swing.*; //note we use "javax" for "JFrame" 
import java.awt.event.*; 
 
class Operation(){ 
   public void calc(){ 
      JFrame frame1 = new JFrame("Calculator"); //frame_name("label") 
      frame1.setBounds(300,200,220,350); //(x_crd,y_crd,width,height) 
 
      JButton a = new JButton ("1"); //button_na