Rewriting Calculator2.java as an application using layout manager
Flow, Border, or Grid.
Make Calculator2.java an application using one of the layout.
-------------------------------------------------------------------------------import
java.awt.event.ActionListener;
   import java.awt.event.ActionEvent;
   import java.applet.Applet;
   import javax.swing.JTextField;
   import javax.swing.JLabel;
   import javax.swing.JButton;
   import javax.swing.JOptionPane;
   import javax.swing.Box;

   public class Calculator2 extends Applet
   {
   
      private JTextField operand1;
      private JTextField operand2;
      private JTextField result;
      private JLabel plusLabel;
      private JLabel equalsLabel;
      private JButton addButton;
      private JButton subtractButton;
      private JButton multiplyButton;
      private JButton divideButton;
         
      public void init()
      {
         operand1 = new JTextField(10);
         plusLabel = new JLabel(" ? ");
         operand2 = new JTextField(10);
         equalsLabel = new JLabel("=");
         result = new JTextField(10);
         result.setEditable(false);
         addButton = new JButton("+");
         subtractButton = new JButton("-");
         multiplyButton = new JButton("x");
         divideButton = new JButton("/");
      
              
         Box vBox = Box.createVerticalBox();
      
         Box dataBox = Box.createHorizontalBox();
         dataBox.add(operand1);
         dataBox.add(plusLabel);
         dataBox.add(operand2);
         dataBox.add(equalsLabel);
         dataBox.add(result);
         vBox.add(dataBox);
      
         Box buttonBox = Box.createHorizontalBox();
         buttonBox.add(addButton);
         buttonBox.add(subtractButton);
         buttonBox.add(multiplyButton);
         buttonBox.add(divideButton);
         vBox.add(buttonBox);
      
         add(vBox);
      
         operationListener al = new operationListener();
         addButton.addActionListener(al);
         subtractButton.addActionListener(al);
         multiplyButton.addActionListener(al);
         divideButton.addActionListener(al);
              
      }
   
   
      private class operationListener implements ActionListener
      {
         public void actionPerformed(ActionEvent ae)
         {
            String op1 = operand1.getText();
            double d1;
            try {
               d1 = Double.parseDouble(op1);
            }
               catch( NumberFormatException nfe ) {
                  JOptionPane.showMessageDialog(null,
                                       "First operand is not a proper number");
                  return;
               }
            String op2 = operand2.getText();
            double d2;
            try {
               d2 = Double.parseDouble(op2);
            }
               catch(NumberFormatException nfe ) {
                  JOptionPane.showMessageDialog(null,
                                       "Second operand is not a proper number");
                  return;
               }
            double res = 0.0;
            if( ae.getSource() == addButton )
               res = d1 + d2;
            else if( ae.getSource() == subtractButton )
               res = d1 - d2;
            else if ( ae.getSource() == multiplyButton )
               res = d1 * d2;
            else if (ae.getSource() == divideButton )
            { 
               if (d2 == 0) JOptionPane.showMessageDialog(null,
                                       "Divide by zero error");
                              else 
                                  {JOptionPane.showMessageDialog(null,
                                       "Divisor is " + d2 + " dividend is " + d1);
                                    res = d1/d2;
                                   } 
            }
                   
            result.setText(res + "");
         }
      }
   }
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P.S. Please use very basic codes for this programe.
Question needs to be answered before 4/28/05 11:30pm...and it will be
deleted if not answered.