import java.util.*; 
import javax.swing.border.*; 
import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*; 

class FlagQuiz {
    public static void main(String[] args) {
	JFrame frame = new JFrame(); 
	Container contentPane = frame.getContentPane(); 

        // enable explicit positioning of GUI components
        contentPane.setLayout( null );

        // set up flagJPanel
        JPanel flagJPanel = new JPanel();
        flagJPanel.setBounds( 16, 8, 100, 90 );
        flagJPanel.setLayout( null );
        flagJPanel.setBorder( new TitledBorder( "Flag" ) );
        contentPane.add( flagJPanel );

        // set up flagIconJLabel
        JLabel flagIconJLabel = new JLabel();
        flagIconJLabel.setBounds( 10, 14, 80, 80 );
        flagIconJLabel.setHorizontalAlignment( JLabel.CENTER );
        flagJPanel.add( flagIconJLabel );

        // set up selectCountryJLabel
        JLabel selectCountryJLabel = new JLabel();
        selectCountryJLabel.setBounds( 136, 8, 88, 21 );
        selectCountryJLabel.setText( "Select country:" );
        contentPane.add( selectCountryJLabel );

        String[] countries = { "Russia", "China", "United States", "Italy", "Australia", "South Africa", "Brazil", "Spain" };

        Arrays.sort( countries ); // sort the array

        // set up selectCountryJComboBox
        JComboBox selectCountryJComboBox = new JComboBox( countries );
        selectCountryJComboBox.setBounds( 136, 32, 135, 21 );
        selectCountryJComboBox.setMaximumRowCount( 3 );
        contentPane.add( selectCountryJComboBox );

	QuizListener listener = new QuizListener(selectCountryJComboBox, countries, flagIconJLabel); 

        // set up feedbackJTextField
        JTextField feedbackJTextField = new JTextField();
        feedbackJTextField.setBounds( 136, 64, 135, 32 );
        feedbackJTextField.setHorizontalAlignment(JTextField.CENTER );
        feedbackJTextField.setEditable( false );
        contentPane.add( feedbackJTextField );

        // set up submitJButton
        JButton submitJButton = new JButton();
        submitJButton.setBounds( 287, 8, 88, 32 );
        submitJButton.setText( "Submit" );
        contentPane.add( submitJButton );

	submitJButton.addActionListener(listener); 

        // set up nextFlagJButton
        JButton nextFlagJButton = new JButton();
        nextFlagJButton.setBounds( 287, 48, 88, 32 );
        nextFlagJButton.setText( "Next Flag" );
        nextFlagJButton.setEnabled( false );
        contentPane.add( nextFlagJButton );

	frame.setSize(400, 400); 
	frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
	frame.setVisible(true); 
    }
}

class QuizListener implements ActionListener {

    int index; 
    String answer; 

    JComboBox comboBox; 
    String[] countries; 
    JLabel flagIcon; 

    QuizListener(JComboBox comboBox, String[] countries, JLabel flagIcon) { 

	this.comboBox = comboBox; 
	this.countries = countries; 
	this.flagIcon = flagIcon; 

        // create the path for that flag
        String country = countries[ countries.length -1 - this.index ];
        String countryPath = "images/" + country + ".png";
        this.answer = country; 

        // set the flagIconJLabel to display the flag
        flagIcon.setIcon( new ImageIcon( countryPath ) );

    }

    public void actionPerformed(ActionEvent event) {

	System.out.println("You have guessed: " + countries[this.comboBox.getSelectedIndex()]); 

	System.out.println("The right answer was: " + this.answer); 

        if (this.index < this.countries.length - 1) { 
	    this.index += 1;

            // create the path for that flag
            String country = countries[ countries.length -1 - this.index ];
            String countryPath = "images/" + country + ".png";
	    this.answer = country;

            // set the flagIconJLabel to display the flag
            flagIcon.setIcon( new ImageIcon( countryPath ) );


	} else { 

	    System.out.println("Sorry, no more flags."); 

	} 

    }
}