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import   java.awt.*;
import   java.awt.event.*;
import   javax.swing.*;
public   class   Calculator
{
      public   static   void   main(String[]   args)
      {    
            CalculatorFrame   frame   =   new   CalculatorFrame();
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
      }
}
/**
      A   frame   with   a   calculator   panel.
*/
class   CalculatorFrame   extends   JFrame
{
      public   CalculatorFrame()
      {
            setTitle( "Calculator ");
            CalculatorPanel   panel   =   new   CalculatorPanel();
            add(panel);
            pack();
      }
}
/**
      A   panel   with   calculator   buttons   and   a   result   display.
*/
class   CalculatorPanel   extends   JPanel
{    
      public   CalculatorPanel()
      {    
      &


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