Write a class GBP2HKD containing the following methods: (a) constructor : which builds the frame shown...

Write a class GBP2HKD containing the following methods:

(a) constructor : which builds the frame shown on the right side. The frame consists of

• a pull-down menu "Action" with menu items "Convert" and "Exit",

• a textfield to enter GBP amount. Some text is in the text field to provide information to the user on what to input. The user needs to delete the text before entering the numbers.

• a label to display the amount of HKD (please use the exchange rate of 1 GBP to exchange for 9.9 HKD).

Copy the class, including import statement(s), as the answers to this part.

(b) actionPerformed() : which perform necessary actions when each menu item is selected. When "Convert" is selected, the amount of HKD is calculated and displayed on the label. When "Exit" is selected, the program terminates.

(c) main() : which creates an GBP2HKD object and sets it visible for testing.

Expert Solution

GBP2HKD.java:

   import java.awt.FlowLayout;
   import java.awt.GridLayout;
   import java.awt.event.ActionEvent;
   import java.awt.event.ActionListener;
   import javax.swing.JFrame;
   import javax.swing.JLabel;
   import javax.swing.JMenu;
   import javax.swing.JMenuBar;
   import javax.swing.JMenuItem;
   import javax.swing.JOptionPane;
   import javax.swing.JPanel;
   import javax.swing.JTextField;

   public class GBP2HKD extends JFrame implements ActionListener {
       private static JMenuItem convert_Menu, exit_Menu;
       private static JTextField inp_Field;
       private static JLabel res_Label;
       private static final double GBP_TO_HKD = 9.9;
       public GBP2HKD()
       {
           // initialize the main frame and the main panel
           JPanel panel = new JPanel(new FlowLayout(FlowLayout.CENTER));

           // initialize the menu bar, menu and menu items
           JMenuBar menu_Bar = new JMenuBar();
           JMenu menu = new JMenu("Action");
           convert_Menu = new JMenuItem("Convert");
           exit_Menu = new JMenuItem("Exit");
           menu.add(convert_Menu);
           menu.add(exit_Menu);
           menu_Bar.add(menu);

           // initialize the panel and the textfield and the result label to the panel
           JPanel panel_1 = new JPanel(new GridLayout(2, 0));
           inp_Field = new JTextField(20);
           inp_Field.setText("GBP Amount");
           res_Label = new JLabel("Result:");
           panel_1.add(inp_Field);
           panel_1.add(res_Label);

           // add the sub panel to the main panel
           panel.add(panel_1);

           // finally, add the main panel to the JFrame
           setJMenuBar(menu_Bar);
           add(panel);

           // action listener for menu items
           convert_Menu.addActionListener(this);
           exit_Menu.addActionListener(this);
       }
       @Override
       public void actionPerformed(ActionEvent ae)
       {
           //ae = action event
           if(ae.getSource() == convert_Menu)
           {
                   // convert the amount
               if(inp_Field.getText().equals(""))
               {
                   JOptionPane.showMessageDialog(null, "Please enter a GBP amount");
                   return;
               }
               double amnt = Double.parseDouble(inp_Field.getText().trim());
               double res = convertAmount(amnt);
               res_Label.setText(String.format("$%.2f", res));
           }
           else if(ae.getSource() == exit_Menu)
               System.exit(0);
       }

       // method to convert GBP amount to HKD amount
       private static double convertAmount(double amnt)
       {
           return(amnt * GBP_TO_HKD);
       }
   }

GBP_Test.java:

import javax.swing.JFrame;

   public class GBP_Test {
       public static void main(String[] args) {
           GBP2HKD gpb_Object = new GBP2HKD();
           gpb_Object.setTitle("GBP To HKD");
           gpb_Object.setSize(250, 120);
           gpb_Object.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
           gpb_Object.setLocationRelativeTo(null);
           gpb_Object.setVisible(true);
       }
   }

Output Screenshot:

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