我尝试使用数组创建10个多项选择问题测验。我非常新，所以请耐心等待。我现在能够获得一个窗口来填充，标题和我设置的按钮。按钮不做任何事情，选择的问题不会填充。似乎当我将类调用到main方法时，它只调用构造函数。我不确定自己哪里出错了。我有一个数组用于我的选择问题，以及有问题和正确答案的数组。请帮忙。我已经为此工作了4天。
第一个文件设置数据：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
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);
qaid = 0;
setData();
String readqaId = 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 String 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";
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";
map = new HashMap<>();
return null;
}
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(choices[qaid][1]);
choice2.setText(choices[qaid][2]);
choice3.setText(choices[qaid][3]);
choice4.setText(choices[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 qid = 0; qid<qnum;qid++)
if(choices[qid][1].equals(map.get(qid)))
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);
}
}
}
}
第二个文件拉出第一个文件：
import java.util.Arrays;
public class QuizProgram
{
public static void main(String args[])
{
Test2 test2 = new Test2();
}
}
答案 0 :(得分：3)
你定义了
questions = new String[10][5];
然后
questions[10][0] = "What size is a tennis ball?";
questions[10][1] = "2.57 - 2.70 inches";
questions[10][2] = "3 - 4 inches";
questions[10][3] = "1 - 2 inches";
questions[10][4] = "5-6 inches";
在定义长度为10的问题时，您无法访问索引10。
答案 1 :(得分：2)
我看到了一些问题：
setData方法，因此您没有初始化数组。相反，您要声明一个同名变量 - String setData; setData，那么您将得到一个ArrayIndexOutOfBoundsExcpetion，因为10个元素的数组只有0到9的索引。您应该正确地初始化数组：questions = new String[11][5];和{ {1}}。要么就是这样，要么你应该删除一个问题。应该是：
choices = new String[11][2];