Java-Programming-Exercises/QuizCardPlayer.java at master · RoyTien/Java-Programming-Exercises · GitHub

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import java.util.*;

import java.awt.event.*;

import javax.swing.*;

import java.awt.*;

import java.io.*;

public class QuizCardPlayer{

private JTextArea display;

private JTextArea answer;

private ArrayList<QuizCard> cardList;

private QuizCard currentCard;

private int currentCardIndex;

private JFrame frame;

private JButton nextButton;

private boolean isShowAnswer;

public static void main(String[] args){

QuizCardPlayer reader = new QuizCardPlayer();

reader.go();

}

public void go(){

//Create GUI

frame = new JFrame("Quiz Card Plalyer");

JPanel mainPanel = new JPanel();

Font bigFont = new Font("sanserif", Font.BOLD, 24);

display = new JTextArea(10, 20);

display.setFont(bigFont);

//自动换行

display.setLineWrap(true);

//能否编辑

display.setEditablt(false);

JScrollPane qScroller = new JScrollPane(display);

qScroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);

qScroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

nextButton = new JButton("Show Question");

mainPanel.add(qScroller);

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());

fileMenu.add(loadMenuItem);

menuBar.add(fileMenu);

frame.setJMenuBar(menuBar);

frame.getContentPane().add(BorderLayout.CENTER, mainPanel);

frame.setSize(640, 500);

frame.setVisible(true);

}

public class NextCardListener implements ActionListener{

//如果是个问题,显示答案,否则显示下一个问题

//改一个标识表明我们已经浏览了问题或答案

//这个是发生操作时程序监听到然后自动调用的

public void actionPerformed(ActionEvent ev){

//检查isShowAnswer来判断现在看的是问题还是答案,并根据回答来执行适当的工作

if(isShowAnswer){

//Show Answer

display.setText(currentCard.getAnswer());

nextButton.setText("Next Card");

isShowAnswer = false;

}else{

//Show Question

if(currentCardIndex < cardList.size()){

showNextCard();

}else{

//No more cards

display.setText("That was last card");

nextButton.setEnabled(false);

}

public class OpenMenuListener implements ActionListener{

public void actionPerformed(ActionEvent ev){

//JFileChooser() - Java Swing提供的文件选择对话框

JFileChooser fileOpen = new JFileChooser();

fileOpen.showOpenDialog(frame);

//打开文件的对话框让用户选择文件

loadFile(fileOpen.getSelectedFile());

}

private void loadFile(File file){

//生成一个文件对话框

//让用户把一个卡片设置打开

cardList = new ArrayList<QuizCard>();

try{

BufferedReader reader = new BufferedReader(new FileReader(file));

String line = null;

//读取一行数据, 传给makeCard()来吧字符串解析成卡片加到ArrayList中

while((line = reader.readLine()) != null){

makeCard(line);

}

reader.close();

}catch(Exception ex){

System.out.println("couldn't read the card file");

ex.printStackTrace();

}

private void makeCard(String lineToParse){

//创建卡片的ArrayList,并从文本文件中读取它们

//调用OpenMenuListener事件处理器,每次从文件中读取一行

//告诉makeCard()方法创建一个新卡片

//每一行都是一张卡片,分解成问题和答案

String[] result = lineToParse.split("/");

QuizCard card = new QuizCard(result[0], result[1]);

cardList.add(card);

System.out.println("made a card")''

}

private void showNextCard(){

//调用LoadFile方法,从文本文件中读取一行

//创建一个新的QuizCard,通过调用CardList把它jiaruArrayList中

currentCard = cardList.get(currentCardIndex);

currentCardIndex++;

display.setText(currentCard.getQuestion());

nextButton.setText("Show Answer");

isShowAnswer = true;

}

Java-Programming-Exercises/QuizCardPlayer.java at master · RoyTien/Java-Programming-Exercises · GitHub

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