[Ch16] QuizCardPlayer Now With Lambdas (12afca46) · Commits · examples / Head First Java 3rd Edition

src/main/java/ch16/QuizCardPlayer.java

+21 −36

Changes for src/main/java/ch16/QuizCardPlayer.java: 21 added lines, 36 removed lines.
Original line number	Diff line number	Diff line
		@@ -2,65 +2,58 @@ package ch16;

		import javax.swing.*;
		import java.awt.*;
		import java.awt.event.*;
		import java.io.*;
		import java.util.ArrayList;

		public class QuizCardPlayer {

		private JTextArea display;
		private JTextArea answer;
		private ArrayList<QuizCard> cardList;
		private QuizCard currentCard;
		private int currentCardIndex;
		private QuizCard currentCard;
		private JTextArea display;
		private JFrame frame;
		private JButton nextButton;
		private boolean isShowAnswer;


		public static void main(String[] args) {
		QuizCardPlayer reader = new QuizCardPlayer();
		reader.go();
		}

		public void go() {

		// build gui

		frame = new JFrame("Quiz Card Player");
		JPanel mainPanel = new JPanel();
		Font bigFont = new Font("sanserif", Font.BOLD, 24);

		display = new JTextArea(10, 20);
		display.setFont(bigFont);

		display.setLineWrap(true);
		display.setEditable(false);

		JScrollPane qScroller = new JScrollPane(display);
		qScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
		qScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		JScrollPane scroller = new JScrollPane(display);
		scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
		scroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
		mainPanel.add(scroller);

		nextButton = new JButton("Show Question");
		mainPanel.add(qScroller);
		nextButton.addActionListener(e -> nextCard());
		mainPanel.add(nextButton);
		nextButton.addActionListener(new NextCardListener());

		JMenuBar menuBar = new JMenuBar();
		JMenu fileMenu = new JMenu("File");

		JMenuItem loadMenuItem = new JMenuItem("Load card set");
		loadMenuItem.addActionListener(new OpenMenuListener());
		loadMenuItem.addActionListener(e -> open());

		fileMenu.add(loadMenuItem);
		menuBar.add(fileMenu);
		frame.setJMenuBar(menuBar);

		frame.getContentPane().add(BorderLayout.CENTER, mainPanel);
		frame.setSize(640, 500);
		frame.setSize(500, 400);
		frame.setVisible(true);
		}

		} // close go


		public class NextCardListener implements ActionListener {
		public void actionPerformed(ActionEvent ev) {
		private void nextCard() {
		if (isShowAnswer) {
		// show the answer because they’ve seen the question
		display.setText(currentCard.getAnswer());
		@@ -69,9 +62,7 @@ public class QuizCardPlayer {
		} else {
		// show the next question
		if (currentCardIndex < cardList.size()) {

		showNextCard();

		} else {
		// there are no more cards!
		display.setText("That was last card");
		@@ -79,30 +70,24 @@ public class QuizCardPlayer {
		}
		}
		}
		}

		public class OpenMenuListener implements ActionListener {
		public void actionPerformed(ActionEvent ev) {
		private void open() {
		JFileChooser fileOpen = new JFileChooser();
		fileOpen.showOpenDialog(frame);
		loadFile(fileOpen.getSelectedFile());
		}
		}

		private void loadFile(File file) {

		cardList = new ArrayList<QuizCard>();
		cardList = new ArrayList<>();
		try {
		BufferedReader reader = new BufferedReader(new FileReader(file));
		String line = null;
		String line;
		while ((line = reader.readLine()) != null) {
		makeCard(line);
		}
		reader.close();

		} catch (Exception ex) {
		System.out.println("couldn’t read the card file");
		ex.printStackTrace();
		} catch (IOException e) {
		System.out.println("Couldn't write the cardList out: " + e.getMessage());
		}

		// now time to start by showing the first card
		@@ -123,7 +108,7 @@ public class QuizCardPlayer {
		nextButton.setText("Show Answer");
		isShowAnswer = true;
		}
		} // close class
		}

src/main/java/ch16/ReadAFile.java

+2 −2

Changes for src/main/java/ch16/ReadAFile.java: 2 added lines, 2 removed lines.
Original line number	Diff line number	Diff line
		@@ -16,8 +16,8 @@ class ReadAFile {
		}
		reader.close();

		} catch (Exception ex) {
		ex.printStackTrace();
		} catch (IOException e) {
		e.printStackTrace();
		}
		}
		}
		No newline at end of file