我的申请是一个多重选择测验。现在只有两个问题，所以我可以测试逻辑，但在我弄清楚之后，加起来就是100。真的我有一个新的框架，按钮添加到面板，然后面板添加到JFrame。然后我使用nextQuestion（）方法允许我经历多个问题，只要有问题留下。并且还有一个计时器，我通过他们为每个问题给出一个时间，10秒。
protected void nextQuestion() {
timer.stop();
currentQuestion++;
if (currentQuestion >= quiz.size()) {
cardLayout.show(QuestionsPanel, "last");
next.setEnabled(false);
//Show however many correct after last question.
//iterate on the collection to count the selected radio buttons
//What im confused about is really how do i tell the program which (options) are right or wrong.
//and if i can do that how do i only count the correct ones.
//or for example do i have to take the total questions and subtract by the ones they didnt choose?
//a code example on how to do this would be great.
} else {
cardLayout.show(QuestionsPanel, Integer.toString(currentQuestion));
startTime = null;
next.setText("Next");
next.setEnabled(true);
timer.start();
}
}
public interface Question {
public String getPrompt();
public String getCorrectAnswer();
public String[] getOptions();
public String getUserResponse();
public void setUserResponse(String response);
public boolean isCorrect();
}
public class ChoiceQuestion implements Question {
private final String prompt;
private final String correctAnswer;
private final String[] options;
private String userResponse;
public ChoiceQuestion(String prompt, String correctAnswer, String... options) {
this.prompt = prompt;
this.correctAnswer = correctAnswer;
this.options = options;
}
@Override
public String getPrompt() {
return prompt;
}
@Override
public String getCorrectAnswer() {
return correctAnswer;
}
@Override
public String[] getOptions() {
return options;
}
@Override
public String getUserResponse() {
return userResponse;
}
@Override
public void setUserResponse(String response) {
userResponse = response;
}
@Override
public boolean isCorrect() {
return getCorrectAnswer().equals(getUserResponse());
}
}
public class QuestionPane extends JPanel {
private Question question;
public QuestionPane(Question question) {
this.question = question;
setLayout(new BorderLayout());
JLabel prompt = new JLabel("<html><b>" + question.getPrompt() + "</b></html>");
prompt.setHorizontalAlignment(JLabel.LEFT);
add(prompt, BorderLayout.NORTH);
JPanel guesses = new JPanel(new GridBagLayout());
guesses.setBorder(new EmptyBorder(10,10,10,10));
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.weightx = 1;
gbc.anchor = GridBagConstraints.WEST;
List<String> options = new ArrayList<>(Arrays.asList(question.getOptions()));
options.add(question.getCorrectAnswer());
Collections.sort(options);
ButtonGroup bg = new ButtonGroup();
for (String option : options) {
JRadioButton btn = new JRadioButton(option);
bg.add(btn);
guesses.add(btn, gbc);
}
add(guesses);
}
public Question getQuestion() {
return question;
}
public class ActionHandler implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
getQuestion().setUserResponse(e.getActionCommand());
}
}
}
}
所以我真的只是在做那个小的if else代码块时遇到了问题。如果你们能帮助我的话。我有一些关于迭代集合的想法虽然我不知道怎么做。这些只是我使用的类和我遇到问题的方法。
答案 0 :(得分：1)
非常简单，当调用nextQuestion时，您想检查currentQuestion是否正确
private int correctAnswers = 0;
//...
protected void nextQuestion() {
timer.stop();
if (currentQuestion >= 0 && currentQuestion < quiz.size()) {
Question question = quiz.get(currentQuestion);
if (question.isCorrect()) {
correctAnswers++;
}
}
currentQuestion++;
if (currentQuestion >= quiz.size()) {
cardLayout.show(panelOfQuestions, "last");
next.setEnabled(false);
} else {
cardLayout.show(panelOfQuestions, Integer.toString(currentQuestion));
startTime = null;
next.setText("Next");
next.setEnabled(true);
timer.start();
}
}
答案 1 :(得分：-1)
以下是您的问题的示例解决方案。正是您的原始代码，有一些修改。关键是要了解您必须随时关联所选答案并填写选择题的“userResponse”字段。
很明显，设置此项的最佳位置是用户按下“下一步”按钮。检查选中的单选按钮并相应地填写ChoiseQuestion。
最后，只需管理测验列表即可查看有多少正确结果。在我的示例中，结果将打印在控制台上。
公共类QuizMain {public static void main(String[] args) {
new QuizMain();
}
public QuizMain() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
List<Question> quiz = new ArrayList<>(5);
// Couple of conceptual mistakes here....
quiz.add(new ChoiceQuestion("Where is Japan Located?", "Asia", "North America", "Africa", "Europe", "Asia"));
// There was a mistake, correct answer is 2
// quiz.add(new ChoiceQuestion("1 + 1:", "2", "4", "3", "1"));
quiz.add(new ChoiceQuestion("1 + 1:", "2", "4", "3", "2", "1"));
JFrame frame = new JFrame("QUIZ TIME!");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new QuizPane(quiz));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class QuizPane extends JPanel {
private List<Question> quiz;
private long countdown = 10;
private Timer timer;
private JButton next;
private JButton intro;
private CardLayout cardLayout;
private int currentQuestion;
private JPanel QuestionsPanel;
private Long startTime;
public QuizPane(List<Question> quiz) {
this.quiz = quiz;
cardLayout = new CardLayout();
QuestionsPanel = new JPanel(cardLayout);
QuestionsPanel.setBorder(new EmptyBorder(40,45,40,45));
JButton start = new JButton("Start");
start.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
currentQuestion = -1;
nextQuestion();
timer.start();
}
});
JButton intro = new JButton("Instructions");
intro.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
instructionBox();
}
});
JPanel mainPanel = new JPanel(new GridBagLayout());
mainPanel.add(start);
mainPanel.add(intro);
QuestionsPanel.add(mainPanel, "start");
for (int index = 0; index < quiz.size(); index++) {
Question question = quiz.get(index);
QuestionPane pane = new QuestionPane(question);
question.setButtonGroup(pane.getButtonGroup());
QuestionsPanel.add(pane, Integer.toString(index));
}
QuestionsPanel.add(new JLabel("You have finished the Quiz"), "last");
currentQuestion = 0;
cardLayout.show(QuestionsPanel, "Start");
setLayout(new BorderLayout());
add(QuestionsPanel);
JPanel buttonPane = new JPanel(new FlowLayout(FlowLayout.RIGHT));
next = new JButton("Next");
buttonPane.add(next);
next.setEnabled(false);
add(buttonPane, BorderLayout.SOUTH);
next.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
nextQuestion();
}
});
timer = new Timer(250, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (startTime == null) {
startTime = System.currentTimeMillis();
}
long duration = (System.currentTimeMillis() - startTime) / 1000;
if (duration >= countdown) {
nextQuestion();
} else {
long timeLeft = countdown - duration;
next.setText("Next (" + timeLeft + ")");
next.repaint();
}
}
});
}
protected void nextQuestion() {
// store the selected answer for each question
if (currentQuestion >= 0 && currentQuestion < quiz.size() ) {
Question currentQObject = quiz.get(currentQuestion);
if (currentQObject != null) {
currentQObject.setUserResponse(getSelected(currentQObject.getButtonGroup()));
}
}
timer.stop();
currentQuestion++;
if (currentQuestion >= quiz.size()) {
cardLayout.show(QuestionsPanel, "last");
next.setEnabled(false);
//Show however many correct after last question.
//iterate on the collection to count the selected radio buttons
//What im confused about is really how do i tell the program which (options) are right or wrong.
//and if i can do that how do i only count the correct ones.
//or for example do i have to take the total questions and subtract by the ones they didnt choose?
//a code example on how to do this would be great.
// Just iterate over quiz list to check if answers are correct:
int totalCorrect = 0;
for (Question q : quiz) {
if (q.isCorrect()) {
totalCorrect++;
}
}
// Show Corrects any way....
System.out.println("Total correct responses: " + totalCorrect);
} else {
cardLayout.show(QuestionsPanel, Integer.toString(currentQuestion));
startTime = null;
next.setText("Next");
next.setEnabled(true);
timer.start();
}
}
private String getSelected(ButtonGroup buttonGroup) {
JRadioButton selectedRadio = null;
Enumeration e = buttonGroup.getElements();
while (e.hasMoreElements()) {
JRadioButton rad = (JRadioButton) e.nextElement();
if (rad.isSelected()) {
selectedRadio = rad;
break;
}
}
return selectedRadio.getText();
}
protected void instructionBox() {
JOptionPane.showMessageDialog(null,"<html><b><div width='111px' height = '82px' align='justified'> 1.You have limited time to answer each question and your score will be shown at the end of the test. Good Luck!</div></body></html>",
"Instructions",
JOptionPane.INFORMATION_MESSAGE);
}
}
public interface Question {
public String getPrompt();
public void setButtonGroup(ButtonGroup buttonGroup);
public ButtonGroup getButtonGroup();
public String getCorrectAnswer();
public String[] getOptions();
public String getUserResponse();
public void setUserResponse(String response);
public boolean isCorrect();
}
public class ChoiceQuestion implements Question {
private final String prompt;
private final String correctAnswer;
private final String[] options;
private ButtonGroup buttonGroup;
private String userResponse;
public ChoiceQuestion(String prompt, String correctAnswer, String... options) {
this.prompt = prompt;
this.correctAnswer = correctAnswer;
this.options = options;
}
@Override
public void setButtonGroup(ButtonGroup buttonGroup) {
this.buttonGroup = buttonGroup;
}
@Override
public ButtonGroup getButtonGroup() {
return this.buttonGroup;
}
@Override
public String getPrompt() {
return prompt;
}
@Override
public String getCorrectAnswer() {
return correctAnswer;
}
@Override
public String[] getOptions() {
return options;
}
@Override
public String getUserResponse() {
return userResponse;
}
@Override
public void setUserResponse(String response) {
userResponse = response;
}
@Override
public boolean isCorrect() {
return getCorrectAnswer().equals(getUserResponse());
}
}
public class QuestionPane extends JPanel {
private Question question;
private ButtonGroup buttonGroup = null;
public QuestionPane(Question question) {
this.question = question;
setLayout(new BorderLayout());
JLabel prompt = new JLabel("<html><b>" + question.getPrompt() + "</b></html>");
prompt.setHorizontalAlignment(JLabel.LEFT);
add(prompt, BorderLayout.NORTH);
JPanel guesses = new JPanel(new GridBagLayout());
guesses.setBorder(new EmptyBorder(10,10,10,10));
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.weightx = 1;
gbc.anchor = GridBagConstraints.WEST;
List<String> options = new ArrayList<>(Arrays.asList(question.getOptions()));
//options.add(question.getCorrectAnswer());
Collections.sort(options);
ButtonGroup bg = new ButtonGroup();
for (String option : options) {
JRadioButton btn = new JRadioButton(option);
btn.setName(option);
bg.add(btn);
guesses.add(btn, gbc);
}
this.buttonGroup = bg;
add(guesses);
}
public ButtonGroup getButtonGroup() {
return buttonGroup;
}
public Question getQuestion() {
return question;
}
public class ActionHandler implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
getQuestion().setUserResponse(e.getActionCommand());
}
}
}
希望有所帮助