我之前发过一个问题，现在我的窗格显示问题和选项a-d。当用户选择选项并单击下一步时，没有任何操作。我希望用户选择他们的选项，单击下一步，让测验显示“正确”或“不正确”，然后转到下一个答案。我相信我的错误在actionPeformed（）方法或getSelection（）方法中。我还必须创建一个带有数组的新方法来提供答案。我尝试运行调试器并且没有显示变量。不知道我是如何弄乱代码的，因为我认为它会像预期的那样运行。请帮忙。如果感兴趣的上一篇文章可以在java quiz only accessing constructor
找到第一个文件
class Test2 extends JFrame implements ActionListener {
JPanel panel;
JPanel panelresult;
JRadioButton choice1;
JRadioButton choice2;
JRadioButton choice3;
JRadioButton choice4;
ButtonGroup bg;
JLabel question;
JButton next;
String[][] questions;
String[][] choices;
int qaid;
HashMap<Integer, String> map;
public Test2() {
setTitle("Tennis Quiz");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(430, 350);
setLocation(300, 100);
setResizable(false);
Container cont = getContentPane();
cont.setLayout(null);
cont.setBackground(Color.GRAY);
bg = new ButtonGroup();
choice1 = new JRadioButton("A");
choice2 = new JRadioButton("B");
choice3 = new JRadioButton("C");
choice4 = new JRadioButton("D");
bg.add(choice1);
bg.add(choice2);
bg.add(choice3);
bg.add(choice4);
question = new JLabel("Choose a correct answer");
question.setForeground(Color.BLUE);
question.setFont(new Font("Aria", Font.BOLD, 11));
next = new JButton("Next");
next.setForeground(Color.GREEN);
panel = new JPanel();
panel.setBackground(Color.LIGHT_GRAY);
panel.setLocation(10, 10);
panel.setSize(400, 300);
panel.setLayout(new GridLayout(6, 2));
panel.add(question);
panel.add(choice1);
panel.add(choice2);
panel.add(choice3);
panel.add(choice4);
panel.add(next);
cont.add(panel);
setVisible(true);
setData();
qaid = 0;
readqaId(qaid);
}
public void actionPerformed(ActionEvent e) {
switch (next.getText()) {
case "Next":
if (qaid < 9) {
map.put(qaid, getSelection());
qaid++;
readqaId(qaid);
} else {
map.put(qaid, getSelection());
next.setText("Show answers");
}
break;
case "Show answers":
break;
}
}
public void setData() {
questions = new String[10][5];
questions[0][0] = "Who is world's number one on the ATP Tennis tour?";
questions[0][1] = "Del Potro";
questions[0][2] = "Nadal";
questions[0][3] = "Djockovic";
questions[0][4] = "Federer";
questions[1][0] = "Who is world's number one on the WTA Tennis tour?";
questions[1][1] = "Venus Williams";
questions[1][2] = "Serenca Williams";
questions[1][3] = "Simona Halep";
questions[1][4] = "Svetlana Kuznetsova";
questions[2][0] = "Who has the fastest serve?";
questions[2][1] = "Andy Roddick";
questions[2][2] = "Milos Roanic";
questions[2][3] = "Leyton Hewitt";
questions[2][4] = "Juan Martin Del Potro";
questions[3][0] = "Who holds the most titles on the mens tour?";
questions[3][1] = "Roger Federer";
questions[3][2] = "Raphael Nadal";
questions[3][3] = "Novak Djokovack";
questions[3][4] = "Andy Murray";
questions[4][0] = "Who holds the most titles on the womens tour?";
questions[4][1] = "Chris Evert";
questions[4][2] = "Billie Jean King";
questions[4][3] = "Martina Navratilova";
questions[4][4] = "Serena Williams";
questions[5][0] = "Which male tennis player has won the most majors?";
questions[5][1] = "Donald Young?";
questions[5][2] = "Raphal Nadal?";
questions[5][3] = "Roger Federer?";
questions[5][4] = "Pete Sampras";
questions[6][0] = "Which male tennis player won the U.S. Open in 2014";
questions[6][1] = "Roger Federer";
questions[6][2] = "Lleyton Hewitt";
questions[6][3] = "Rafael Nadal";
questions[6][4] = "Marian Celic";
questions[7][0] = "Which female tennis player has won all 4 Grand Slams?";
questions[7][1] = "Venus Williams";
questions[7][2] = "Svetlana Kuznetsova";
questions[7][3] = "Caroline Wozniacki";
questions[7][4] = "Serena Williams";
questions[8][0] = "Which male tennis player won the French Open in 2014";
questions[8][1] = "Roger Federer";
questions[8][2] = "Raphael Nadal";
questions[8][3] = "Milos Roanic";
questions[8][4] = "Gael Monfils";
questions[9][0] = "Which female tennis player won the French Open in 2014?";
questions[9][1] = "Venus Williams";
questions[9][2] = "Serena Williams";
questions[9][3] = "Caroline Wozniacki";
questions[9][4] = "Maria Sharapova";
map = new HashMap<>();
}
public void answerKey() {
choices = new String[10][2];
choices[0][0] = "Who is world's number one on the ATP Tennis tour?";
choices[0][3] = "Djockovic";
choices[1][0] = "Who is world's number one on the WTA Tennis tour?";
choices[1][2] = "Serenca Williams";
choices[2][0] = "Who has the fastest serve?";
choices[2][2] = "Milos Roanic";
choices[3][0] = "Who holds the most titles on the mens tour?";
choices[3][1] = "Roger Federer";
choices[4][0] = "Who holds the most titles on the womens tour?";
choices[4][3] = "Martina Navratilova";
choices[5][0] = "Which male tennis player has won the most majors?";
choices[5][3] = "Roger Federer?";
choices[6][0] = "Which male tennis player won the U.S. Open in 2014";
choices[6][4] = "Marian Celic";
choices[7][0] = "Which female tennis player has won all 4 Grand Slams?";
choices[7][4] = "Serena Williams";
choices[8][0] = "Which male tennis player won the French Open in 2014";
choices[8][2] = "Raphael Nadal";
choices[9][0] = "Which female tennis player won the French Open in 2014?";
choices[9][4] = "Maria Sharapova";
}
public String getSelection() {
String selectedChoice = null;
Enumeration<AbstractButton> buttons = bg.getElements();
while (buttons.hasMoreElements()) {
JRadioButton temp = (JRadioButton) buttons.nextElement();
if (temp.isSelected()) {
selectedChoice = temp.getText();
}
}
return (selectedChoice);
}
private String readqaId(int qaid) {
question.setText("" + questions[qaid][0]);
choice1.setText(questions[qaid][1]);
choice2.setText(questions[qaid][2]);
choice3.setText(questions[qaid][3]);
choice4.setText(questions[qaid][4]);
choice1.setSelected(true);
return null;
}
public void reset() {
qaid = 0;
map.clear();
readqaId(qaid);
next.setText("Next");
}
public int calCorrectAnswer() {
int qnum = 10;
int count = 0;
for (int qaid = 0; qaid < qnum; qaid++)
if (choices[qaid][1].equals(map.get(qaid)))
count++;
return count;
}
public class Report extends JFrame {
Report() {
setTitle("Answers");
setSize(850, 550);
setBackground(Color.WHITE);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
dispose();
reset();
}
});
Draw d = new Draw();
add(d);
setVisible(true);
}
class Draw extends Canvas {
public void paint(Graphics g) {
int qnum = 10;
int x = 10;
int y = 20;
for (int i = 0; i < qnum; i++) {
g.setFont(new Font("Aria", Font.BOLD, 12));
g.drawString(i + 1 + "." + choices[i][0], x, y);
y += 30;
g.setFont(new Font("Aria", Font.PLAIN, 12));
g.drawString("Correct Answer" + choices[i][1], x, y);
y += 30;
g.drawString(" Your answer" + map.get(i), x, y);
y += 30;
if (y > 400) {
y = 20;
x = 450;
}
}
int numc = calCorrectAnswer();
g.setColor(Color.BLUE);
g.setFont(new Font("Aria", Font.BOLD, 14));
g.drawString("Number of correct answers." + numc, 300, 500);
}
}
}
}
第二档
public class QuizProgram
{
public static void main(String args[])
{
Test2 test2 = new Test2();
}
}
答案 0 :(得分：0)
您创建了一个按钮但从不添加ActionListener。 试试这个：
next = new JButton("Next");
next.addActionListener(this);
（我假设Test2是你想要使用的ActionListener）
答案 1 :(得分：0)
您的类Test2实现了ActionListener，但是我没有看到任何注册侦听器的代码。
我猜你的意图是当用户点击Next按钮时调用actionPerformed（）。在这种情况下，在创建“下一步”按钮后，您的代码应具有以下行：
next.addActionListener(this);
（“this”是Test2，这是你的ActionListener。）