package Java_Review_Strings;

// StringTokenizer class.
   import java.util.*;
   import java.awt.*;
   import java.awt.event.*;
   import javax.swing.*;

   public class IntegerOps extends JFrame {
      private JLabel promptLabel;
      private JTextField inputField;
      private JTextArea outputArea;
   
   // set up GUI and event handling
      public IntegerOps()
      {
         super( "Testing Class StringTokenizer" );
      
         Container container = getContentPane();
         container.setLayout( new FlowLayout() );
      
         promptLabel = new JLabel( "Enter \"int operator int\" and press Enter" );
         container.add( promptLabel );
      
         inputField = new JTextField( 20 );
         inputField.addActionListener(
                              
                                 new ActionListener() {  // anonymous inner class
                                 
                                 // handle text field event
                                    public void actionPerformed( ActionEvent event )
                                    {      
                                       StringTokenizer tokens = new StringTokenizer( event.getActionCommand());
                                       int a = Integer.parseInt(tokens.nextToken());
                                       String op = tokens.nextToken();
                                       int b = Integer.parseInt(tokens.nextToken());
                                       int c=0;
                                       if(op.equals("+"))
                                            c=a+b;
                                       else if(op.equals("-"))
                                            c=a-b;
                                       else if(op.equals("*"))
                                            c=a*b;
					else if(op.equals("/"))
                                            c=a/b;
					else if(op.equals("%"))
                                            c=a%b;
                                  
                                        outputArea.append( a + " " + op + " " + b + " = " + c + "\n" );
                                    }
                                 
                                 } // end anonymous inner class
                              
                              ); // end call to addActionListener
      
         container.add( inputField );
      
         outputArea = new JTextArea( 10, 20 );
         outputArea.setEditable( false );
         container.add( new JScrollPane( outputArea ) );
         setSize( 275, 240 );  // set the window size
         setVisible( true );   // show the window
      }
   
   // execute application
      public static void main( String args[] )
      {
         IntegerOps application = new IntegerOps();
         application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
      } 
   
   } // end class IntegerAddition