public class SecondsCalcextends JFrame { private JPanel panel; // To reference a

Question

public class SecondsCalcextends JFrame
{
private JPanel panel;   // To reference apanel
private JLabel messageLabel1; // To reference a labelfor days
private JLabel messageLabel2; // To reference a labelfor hours
private JLabel messageLabel3; // To reference a labelfor minutes
private JLabel messageLabel4; // To reference a labelfor minutes
private JTextField daysTextField; // To reference a textfield for days
private JTextField hoursTextField; // To reference atext field for hours
private JTextField minutesTextField; // To reference atext field for minutes
private JTextField secondsTextField; // To reference atext field for seconds
private JButton calcButton;  // To reference acalculate button
private JButton exitButton;  // To reference a exitbutton
private final int WINDOW_WIDTH = 310; // Windowwidth
private final int WINDOW_HEIGHT = 100; // Windowheight

/**
  Constructor
*/

public SecondsCalc()
{
  // Set the window title.
  setTitle("Seconds Calculator");
  
  // Set the size of the window.
  setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
  
  // Specify what happens when the close button isclicked.
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  
  // Build the panel and add it to the frame.
  buildPanel();
  
  // Add the panel to the frame's content pane.
  add(panel);
  
  // Display the window.
  setVisible(true);
}

/**
  The buildPanel method adds a label, text field, and
  add buttons to a panel.
*/

private void buildPanel()
{
  // Create a label for days to display instructions.
  messageLabel1 = new JLabel("days");
  
  // Create a text field for days 10 characters wide.
  daysTextField = new JTextField(10);
  
  // Create a label for hours to displayinstructions.
  messageLabel2 = new JLabel("hours");
  
  // Create a text field for hours 10 characterswide.
  hoursTextField = new JTextField(10);
  
  // Create a label for minutes to displayinstructions.
  messageLabel3 = new JLabel("minutes");
  
  // Create a text field for minutes 10 characterswide.
  minutesTextField = new JTextField(10);
  
  // Create a label for seconds to displayinstructions.
  messageLabel4 = new JLabel("seconds");
  
  // Create a text field for seconds 10 characterswide.
  secondsTextField = new JTextField(10);
  
  // Create a calculate button with the caption"Calculate".
  calcButton = new JButton("Calculate");
  
  // Create a exit button with the caption "Exit".
  exitButton = new JButton("Exit");
  
  // Register the action listeners.
  calcButton.addActionListener(newCalcButtonListener());
  exitButton.addActionListener(newExitButtonListener());
  
  // Create a JPanel object and let the panel
  // field reference it.
  panel = new JPanel();
  
  // Add the label, text field, and button
  // components to the panel.
  panel.add(messageLabel1);
  panel.add(messageLabel2);
  panel.add(messageLabel3);
  panel.add(messageLabel4);
  panel.add(daysTextField);
  panel.add(hoursTextField);
  panel.add(minutesTextField);
  panel.add(secondsTextField);
  panel.add(calcButton);
  panel.add(exitButton);
}

/**
  CalcButtonListener is an action listener class for
  the Calculate button.
*/

private class CalcButtonListener implementsActionListener
    {
        public voidactionPerformerd(ActionEvent e)
        {
           int seconds; // The number of seconds
           int min;
           int day;
           int hour;
           long result;
       
           // Get the text entered by the user into the
           // text fields.
           day = Integer.parseInt(daysTextField.getText());
   hour =Integer.parseInt(hoursTextField.getText());
           min = Integer.parseInt(minutesTextField.getText());
           seconds = Integer.parseInt(secondsTextField.getText());
   //Actullly gettext method returns string and youneed to convert it into int or double value using Integer.parseIntmethod.

           // Calculate to seconds.
   result = (day *((hour * 60 * 60) + (min * 60)+seconds));
   
   // Display the result.
            JOptionPane.showMessageDialog(null, seconds + " result");
        }
    }

/**
  Private inner class that handles the event when
  the user clicks the Exit button.
*/

private class ExitButtonListener implementsActionListener
{
  public void actionPerformed(ActionEvent e)
  {
   System.exit(0);
  }
}
}

Explanation / Answer

You wrote actionPerformed() as"actionPerformerd()"

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