Complete the program which follows to add code for the following three listeners

Question

Complete the program which follows to add code for the following three listeners:
a) An ononymous action listener to use the newly entered number to update the label containing the

converted omount (note there is o privote method in this code to help you).
b) Add an inner class item listener that wilt updote the convertTo lobel to show the tert "Convert Rdte = " pl

conversion rate firom the supplied orroy. The combo box has a method getSelectedlndex$.
c) An anonymous closs whtch implements ONLY the mouseClicked method and updates the lobel containing

converted amount like in (A) above.

import java.awt.";

import java. awt.event. ";

import javax.swing.*;

public class ConvertDollars extends JFrame {
String[] country = {"USA", "Hong Kong", 'UK"};
doub lefi conversion = {0.97 222, 7 .54107, 0.651 95}; int currentlndex = 0;

JComboBox jcbCountry; J Label jlbConvertRate; JLabel jlbConvertsTo; JTextField jtfDollars;

public ConvertDollarsQ {
JPanel top = new JPanel(new GridLayout(1,2)); JLabeljlbEnterDollars = new JLabel("Enter Dollars: "); jtfDollars = new JTextField("1.00");

/A) add an anonymous action listener to use the newty entered number to update the label containing the converted amount (note there is a private method in this code to helP You).

top.add(lbEnterDollars); toP.addUtfDollars);
add(toP, BorderLaYout. NORTH );

jcbCountry= new JComboBox(country);
add(cbCountry, Borderlayout.CE NTER);
11B);dd an inner class item Iistener that witl update the convertTo label to show the text ,,Convert Rate = " plus the conversion rate from the supplied array. The combo box has a method getSelectedlndex0.

JPanel bottom = new JPanel(new GridLayout(3,1)); jlbConvertRate = new JLabel("Convert Rate = " + conversion[0]); jlbConvertsTo = newJLabel("ln CDN$= " + conversionl0]); JButton jbtConvert = new JButton("Convert");

bottom.addfi lbConvertRate);
botto m. ad d(j lbConvertsTo); bottom.add(jbtConvert);
add(bottom, BorderlaYout.SOUTH );

, ttal an anonymous class which imptements ONLY the mouseClicked method and updates the labelcontaining the converted amount like in (A) above.

pack0; )

private void changeConvertNumberQ {
double amount = Double. parseDouble(itfDollars. getText0);
double convertAmount = amount * conversion[icbCountry.getSelected lndexO]; jlbConvertsTo.setText(String.format("ln CDN$ = o/o5.2f', convertAmount));

)

public static void main(Stringfi args) {
ConvertDollars frame = new ConvertDollars0; frame.setTitle("Canadian Dollar Converter"); frame.setLocationRelativeTo(nul I );
f rame. setDefaultCloseOperation(J Frame. EXIT-ON-CLOS E ); frame.setVisi ble(true);

)

Explanation / Answer

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class ConvertDollars extends JFrame {

String[] country = {"USA", "Hong Kong", "UK"};

double[] conversion = {0.97222, 7.54107, 0.65195};

int currentlndex = 0;

JComboBox jcbCountry;

JLabel jlbConvertRate;

JLabel jlbConvertsTo;

JTextField jtfDollars;

public ConvertDollars() {

JPanel top = new JPanel(new GridLayout(1,2));

JLabel jlbEnterDollars = new JLabel("Enter Dollars: ");

jtfDollars = new JTextField("1.00");

top.add(jlbEnterDollars);

top.add(jtfDollars);

add(top, BorderLayout. NORTH );

jcbCountry= new JComboBox(country);

add(jcbCountry, BorderLayout.CENTER);

JPanel bottom = new JPanel(new GridLayout(3,1));

jlbConvertRate = new JLabel("Convert Rate = " + conversion[0]);

jlbConvertsTo = new JLabel("In CDN$= " + conversion[0]);

JButton jbtConvert = new JButton("Convert");

bottom.add(jlbConvertRate);

bottom.add(jlbConvertsTo);

bottom.add(jbtConvert);

add(bottom, BorderLayout.SOUTH );

/* add an anonymous action listener to use the newty entered number to update the label containing the converted amount (note there is a private method in this code to help You). */

jbtConvert.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

changeConvertNumber();

}

} );

/* add an inner class item Iistener that witl update the convertTo label to show the text ,,Convert Rate = " plus the conversion rate from the supplied array. The combo box has a method getSelectedlndex */

jcbCountry.addItemListener(new ItemListener(){

public void itemStateChanged(ItemEvent e)

{

//getItem returns an object so it gets cast

//as a String to retrieve the item value

jlbConvertRate.setText("Convert Rate = " +conversion[jcbCountry.getSelectedIndex()]);

}

});

/* an anonymous class which imptements ONLY the mouseClicked method and updates the labelcontaining the converted amount like in (A) above.*/

top.addMouseListener(new MouseListener() {

public void mouseClicked(MouseEvent e){ changeConvertNumber();}

public void mouseEntered(MouseEvent e){/*implementation goes here...*/}

public void mouseExited(MouseEvent e){/*implementation goes here...*/}

public void mousePressed(MouseEvent e){/*implementation goes here...*/}

public void mouseReleased(MouseEvent e){/*implementation goes here...*/ }

});

pack();

}

private void changeConvertNumber() {

double amount = Double.parseDouble(jtfDollars.getText());

double convertAmount = amount * conversion[jcbCountry.getSelectedIndex()];

jlbConvertsTo.setText(String.format("In CDN$ = %5.2f", convertAmount));

}

public static void main(String[] args) {

ConvertDollars frame = new ConvertDollars();

frame.setTitle("Canadian Dollar Converter");

frame.setLocationRelativeTo(null );

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );

frame.setVisible(true);

}

}

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