我正在尝试用 Java 进行测验,但我无法从测试器类访问数组列表数据,因此我的问题文本没有显示。我有三门课;测试仪、测验界面和测验设置。我已经玩了一段时间了,我很确定我开始让事情变得更糟,所以我想我应该在这里发帖。
这些问题已添加到测试程序文件中的数组列表中,但我似乎无法在该方法的设置类中访问它:
public void setQuestion(int randIndex) {
qi.getQuText().setText(getQuestionList().get(randIndex).getQuestionText());
}
预期的输出是从数组列表中随机抽取一个问题并显示问题文本,但什么也没有出现,而且是空白的。
我对 Java 和编程相当陌生,所以欢迎任何详细的答案!提前致谢。
import java.util.ArrayList;
public class QuizTester {
private static ArrayList<Question> questions; //declares arrayList to holds the questions
public static void main(String[] args) {
QuizSetUp theQuiz = new QuizSetUp();
questions = new ArrayList<Question>(); //constructor
questions.add(new FillInBlank("____________ is the ability of an object to take many forms.", "Polymorphism"));
questions.add(new FillInBlank("The process where one object acquires the properties of another is called __________", "inheritance"));
questions.add(new FillInBlank("The ___________ keyword is used by classes to inherit from interfaces", "implements"));
questions.add(new MultipleChoice("Which programming technique can be used to prevent code and data from being randomly accessed by other code defined outside the class?",
"Polymorphism", "Encapsulation", "Inheritance", "Construction", "Encapsulation"));
theQuiz.pickQuestion();
}
public ArrayList<Question> getQuestionList() {
return this.questions;
}
}
/////////////////////////测验设置文件。
public class QuizSetUp {
private QuizInterface qi;
private QuizTester test;
//private ArrayList<Question> questions; //declares arrayList to holds the questions
private int counter = 1;
Random random;
int randIndex;
public QuizSetUp() {
setInterface();
//questions = new ArrayList<Question>(); //constructor
}
private enum QuAnswer { CORRECT,INCORRECT }
public void setInterface() {
qi = new QuizInterface();
test = new QuizTester();
//add action listeners to each of the buttons
ActionListener cl = new ClickListener();
qi.getNextBtn().addActionListener(cl);
qi.getStartQuizBtn().addActionListener(cl);
//allows users to press enter to start quiz rather than having to click quiz button
KeyListener ent = new KeyBoardListener();
qi.getUName().addKeyListener(ent);
qi.getUPassword().addKeyListener(ent);
}
public void pickQuestion() {
randQuestion();
setQuestion(randIndex);
//setAnswer("A", randIndex);
//setAnswer("B", randIndex);
//setAnswer("C", randIndex);
//setAnswer("D", randIndex);
//setCorrectAnswer(randIndex);
//qi.resetTimer();
}
public void setQuestion(int randIndex) {
qi.getQuText().setText(getQuestionList().get(randIndex).getQuestionText());
}
public void setNextQuestion() {
//qi.getTimer().cancel();
//qi.cancelInterval();
if (counter < 5) { //users must answer five questions to complete quiz
pickQuestion();
} else {
//JOptionPane.showMessageDialog(qi.getPanels(), "End of quiz");
//switch to end panel to show results of quiz
}
}
public int randQuestion() {
random = new Random();
randIndex = random.nextInt(questions.size());
return randIndex;
}
//inner listener class for buttons
private class ClickListener implements ActionListener {
public void actionPerformed(ActionEvent evt) {
if (evt.getSource() == qi.getStartQuizBtn()) {
qi.setEnteredName(qi.getUName().getText());
qi.setEnteredPass(qi.getUPassword().getPassword());
validateInput();
} else if (evt.getSource() == qi.getNextBtn()) {
counter++;
if (counter == 5) {
qi.getNextBtn().setText("Finish Quiz"); //changes next button text on final question
}
if (counter < 6) {
qi.getQuProgress().setText(counter + " of 5");
} else {
//shuffle to end panel
}
}
}
}
//inner listener class for key presses
private class KeyBoardListener implements KeyListener {
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_ENTER) {
qi.setEnteredName(qi.getUName().getText());
qi.setEnteredPass(qi.getUPassword().getPassword());
validateInput();
}
}
@Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
}
@Override
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
}
//method to validate input by user to log in
public void validateInput() {
//presence check on username
if (qi.getEnteredName().length() > 0) {
//presence check on password
if (qi.getEnteredPass().length > 0) {
//ensures password is at least 6 char long
if(qi.getEnteredPass().length > 5) {
qi.getCards().next(qi.getPanels()); //getPanels() == cardPanel
} else {
JOptionPane.showMessageDialog(null,
"Your password must be at least six characters long.",
"Password Violation", JOptionPane.WARNING_MESSAGE);
}
} else {
JOptionPane.showMessageDialog(null,
"Your did not enter a password.",
"Password Violation", JOptionPane.WARNING_MESSAGE);
}
} else {
JOptionPane.showMessageDialog(null,
"You did not enter a username. Please try again.",
"Username Violation", JOptionPane.WARNING_MESSAGE);
}
}
}