所以我有以下代码来制作测验程序。我正在使用的代码扩展了JDialog。我想知道是否有办法将其转换为JPanel，因为当我尝试运行代码时，窗口都很小，我似乎无法移动“下一步”按钮旁边的完成按钮。另外如果我想让这个问题随机怎么做呢？
谢谢
import javax.swing.*;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import java.util.Random;
import javax.swing.JRadioButton;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class MultipleChoice extends JDialog {
int correctAns;
List<Question> questions = new ArrayList<Question>();
//asnwers
JRadioButton[] responses;
ButtonGroup group = new ButtonGroup();
//bottom
JButton next = new JButton("Next");
JButton finish = new JButton("Finish");
public MultipleChoice(){
super();
setModal(true);
setLayout( new BoxLayout(getContentPane(),BoxLayout.Y_AXIS)); //setting up boxlayout
questions.add(new Question("Which of the following is NOT one of the 5 great lakes?",new String[]{"Lake Mead","Lake Huron","Lake Michigan","Lake Erie"}, "Lake Mead"));
questions.add(new Question("What is the Capital of Colorado?",new String[]{"Boulder","Aspen","Denver","Cheyenne"},"Denver"));
questions.add(new Question("Each side of a baseball diamond is 90 feet in length. How far is it around the Baseball Diamond?",new String[]{"270","360","180","390"},"360"));
questions.add(new Question("What color do you get when you combine an equal amount of red paint with an equal amount of yellow paint?",new String[]{"Blue","Orange","Green","Pink"},"Orange"));
questions.add(new Question("How many sides does a trapezoid have?",new String[]{"3","4","5","6"},"2"));
questions.add(new Question("Which is a simile?",new String[]{"My sister is cute like a bunny","My mom has a manly snore","My dad is better than yours"},"My sister is cute like a bunny"));
questions.add(new Question("Polar bears eat penquins?",new String[]{"True","False"},"True"));
//bottom
next.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
setVisible(false);
}
});
finish.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
setVisible(false);
}
});
}
public int beginQuiz(){
int score=0;
for (Question q : questions){
displayQuestion(q);
if (group.getSelection().getActionCommand().equals(q.getans())){
score++;
}
}
dispose();
return score;
}
private void displayQuestion(Question q){
getContentPane().removeAll();
for (Enumeration buttonGroup=group.getElements(); buttonGroup.hasMoreElements(); ){
group.remove((AbstractButton)buttonGroup.nextElement());
}
JLabel questionText = new JLabel(q.getquestion());
getContentPane().add(questionText);
for (String answer : q.getanswers()){
JRadioButton radio = new JRadioButton(answer);
radio.setActionCommand(answer);
group.add(radio);
getContentPane().add(radio);
}
getContentPane().add(next);
getContentPane().add(finish);
pack();
setVisible(true);
}
public static void showSummary(int score){
JOptionPane.showMessageDialog(null,"All Done :), here are your results"+
"\nNumber of incorrect Answers: \t"+(7-score)+
"\nNumber of Correct Answers: \t"+(score)+
"\nPercent Correct: \t\t"+(int)(((float)(score)/7)*100)+"%"
);
if (((int)(((float)(score)/7)*100))> 0.6)
JOptionPane.showMessageDialog(null,"You Passed!");
else {
JOptionPane.showMessageDialog(null,"You are NOT Smarter than a 5th Grader");
}
}
public static void main(String[] args){
MultipleChoice quiz = new MultipleChoice();
int score = quiz.beginQuiz();
showSummary(score);
}
}
class Question {
private String question;
private String[] answers;
private String ans;
String getquestion(){ //getter
return question;
}
void setquestion(String str){ //setter
question = str;
}
String[] getanswers(){ //getter
return answers;
}
void setanswers(String[] str2){ //setter
answers = str2;
}
String getans(){ //getter
return ans;
}
void setans(String str3){ //setter
ans = str3;
}
public Question(String possibleQuestion ,String[] possibleAnswer , String correctAnswer){ //constructor
question = possibleQuestion;
answers = possibleAnswer;
ans = correctAnswer;
}
}
在我编辑并尝试将其转换为JPanel并使用类似建议的cardlayout后，我遇到了一些错误，似乎无法弄清楚如何获取String [] possibleanswer和字符串correctanswer以显示系统知道并匹配正确的答案。这是我更新的代码
谢谢
import javax.swing.*;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import java.util.Random;
import java.awt.CardLayout;
import javax.swing.JRadioButton;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class MultipleChoice {
int correctAns;
List<Question> questions = new ArrayList<Question>();
JPanel p=new JPanel();
CardLayout cards=new CardLayout();
int numQs;
int wrongs=0;
int total=0;
public static void main(String[] args){
new MultipleChoice();
}
public MultipleChoice(){
JFrame frame = new JFrame("Are you Smarter than a 5th Grader?");
frame.setResizable(true);
frame.setSize(500,400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
questions.add(new Question("Which of the following is NOT one of the 5 great lakes?",new String[]{"Lake Mead","Lake Huron","Lake Michigan","Lake Erie"}, "Lake Mead"));
questions.add(new Question("What is the Capital of Colorado?",new String[]{"Boulder","Aspen","Denver","Cheyenne"},"Denver"));
questions.add(new Question("Each side of a baseball diamond is 90 feet in length. How far is it around the Baseball Diamond?",new String[]{"270","360","180","390"},"360"));
questions.add(new Question("What color do you get when you combine an equal amount of red paint with an equal amount of yellow paint?",new String[]{"Blue","Orange","Green","Pink"},"Orange"));
questions.add(new Question("How many sides does a trapezoid have?",new String[]{"3","4","5","6"},"2"));
questions.add(new Question("Which is a simile?",new String[]{"My sister is cute like a bunny","My mom has a manly snore","My dad is better than yours"},"My sister is cute like a bunny"));
questions.add(new Question("Polar bears eat penquins?",new String[]{"True","False"},"True"));
p.setLayout(cards);
numQs=questions.size();
for(int i=0;i<numQs;i++){
p.add(questions[i],"q"+i);
}
Random r=new Random();
int i=r.nextInt(numQs);
cards.show(p,"q"+i);
frame.add(p);
frame.setVisible(true);
}
public void next(){
if((total-wrongs)==numQs){
showSummary();
}else{
Random r=new Random();
boolean found=false;
int i=0;
while(!found){
i=r.nextInt(numQs);
if(!questions[i].used){
found=true;
}
}
cards.show(p,"q"+i);
}
}
public void showSummary(){
JOptionPane.showMessageDialog(null,"All Done :), here are your results"+
"\nNumber of incorrect Answers: \t"+wrongs+
"\nNumber of Correct Answers: \t"+(total-wrongs)+
"\nPercent Correct: \t\t"+(int)(((float)(total-wrongs)/total)*100)+"%"
);
if (((int)(((float)(total-wrongs)/total)*100))> 0.6)
JOptionPane.showMessageDialog(null,"You Passed!");
else {
JOptionPane.showMessageDialog(null,"You are NOT Smarter than a 5th Grader");
}
System.exit(0);
}
}
class Question extends JPanel {
int correctAns;
MultipleChoice Choices;
int selected;
boolean used;
//questions
JPanel qPanel=new JPanel();
//answers
JPanel aPanel=new JPanel();
JRadioButton[] responses;
//bottom
JPanel botPanel=new JPanel();
JButton next=new JButton("Next");
JButton finish=new JButton("Finish");
private String question;
private String[] answers;
private String ans;
public Question(String possibleQuestion ,String[] possibleAnswer , String correctAnswer){ //constructor
this.Choices=Choices;
question = possibleQuestion;
answers = possibleAnswer;
ans = correctAnswer;
setLayout(new BoxLayout(this,BoxLayout.Y_AXIS));
//question
qPanel.add(new JLabel(question));
add(qPanel);
//answer
responses=new JRadioButton[answers.length];
//display possible answer and answers
aPanel.add(responses[i]);
add(aPanel);
//bottom
next.addActionListener(this);
finish.addActionListener(this);
botPanel.add(next);
botPanel.add(finish);
add(botPanel);
}
public Question(String possibleQuestion ,String[] possibleAnswer){ //constructor overloading
question = possibleQuestion;
answers = possibleAnswer;
}
String getquestion(){ //getter
return question;
}
void setquestion(String str){ //setter
question = str;
}
String[] getanswers(){ //getter
return answers;
}
void setanswers(String[] str2){ //setter
answers = str2;
}
String getans(){ //getter
return ans;
}
void setans(String str3){ //setter
ans = str3;
}
public void actionPerformed(ActionEvent e){
Object src=e.getSource();
//next button
if(src.equals(next)){
if(selected==correctAns){
used=true;
Choices.next();
}
}
//finish button
if(src.equals(finish)){
Choices.showSummary();
}
}
}
新修订 所以在我创建界面并实现它之后。我似乎无法显示问题或选项。 JButton似乎没有用。
import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
public class MultipleChoice {
JPanel p=new JPanel();
CardLayout cards=new CardLayout();
int numQs;
int wrongs=0;
int total=0;
public static void main(String[] args){
new MultipleChoice();
}
public MultipleChoice(){
List<Question> questions = new ArrayList<>();
questions.add(new Question("Which of the following is NOT one of the 5 great lakes?",new String[]{"Lake Mead","Lake Huron","Lake Michigan","Lake Erie"}, "Lake Mead"));
questions.add(new Question("What is the Capital of Colorado?",new String[]{"Boulder","Aspen","Denver","Cheyenne"},"Denver"));
questions.add(new Question("Each side of a baseball diamond is 90 feet in length. How far is it around the Baseball Diamond?",new String[]{"270","360","180","390"},"360"));
questions.add(new Question("What color do you get when you combine an equal amount of red paint with an equal amount of yellow paint?",new String[]{"Blue","Orange","Green","Pink"},"Orange"));
questions.add(new Question("How many sides does a trapezoid have?",new String[]{"3","4","5","6"},"2"));
questions.add(new Question("Which is a simile?",new String[]{"My sister is cute like a bunny","My mom has a manly snore","My dad is better than yours"},"My sister is cute like a bunny"));
questions.add(new Question("Polar bears eat penquins?",new String[]{"True","False"},"True"));
JFrame frame = new JFrame("Are you Smarter than a 5th Grader?");
frame.setResizable(true);
frame.setSize(500,400);
frame.add(new QuizPane(questions));
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
public class QuizPane extends JPanel {
private CardLayout cardLayout;
private int currentQuestion;
private JButton next;
private List<Question> question;
private JPanel panelOfQuestions;
public QuizPane(List<Question> question) {
this.question = question;
cardLayout = new CardLayout();
panelOfQuestions = new JPanel(cardLayout);
JButton start = new JButton("Start");
start.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
currentQuestion = -1;
next();
}
});
JPanel filler = new JPanel(new GridBagLayout());
filler.add(start);
panelOfQuestions.add(filler, "start");
for (int index = 0; index < question.size(); index++) {
QuestionInterface quiz = question.get(index);
QuestionPane pane = new QuestionPane(quiz);
panelOfQuestions.add(pane, Integer.toString(index));
}
panelOfQuestions.add(new JLabel("The quiz is over"), "last");
currentQuestion = 0;
cardLayout.show(panelOfQuestions, "start");
setLayout(new BorderLayout());
add(panelOfQuestions);
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() {
public void actionPerformed(ActionEvent e) {
next();
}
});
}
public void next(){
if (currentQuestion >= question.size()) {
cardLayout.show(panelOfQuestions, "last");
next.setEnabled(false);
// You could could loop through all the questions and tally
// the correct answers here
}
else {
cardLayout.show(panelOfQuestions, Integer.toString(currentQuestion));
next.setText("Next");
next.setEnabled(true);
}
}
/*public void showSummary(){ // try to get to show summary after the quiz
JOptionPane.showMessageDialog(null,"All Done :), here are your results"+
"\nNumber of incorrect Answers: \t"+wrongs+
"\nNumber of Correct Answers: \t"+(total-wrongs)+
"\nPercent Correct: \t\t"+(int)(((float)(total-wrongs)/total)*100)+"%"
);
if (((int)(((float)(total-wrongs)/total)*100))> 0.6)
JOptionPane.showMessageDialog(null,"You Passed!");
else {
JOptionPane.showMessageDialog(null,"You are NOT Smarter than a 5th Grader");
}
System.exit(0);
}*/
}
public interface QuestionInterface {
public String getquestion();
public String[] getOptions();
public String getAnswer();
public String getUserResponse();
public void setUserResponse(String response);
public boolean isCorrect();
}
public class Question implements QuestionInterface {
private String possibleQuestion;
private String[] Options;
public String correctAnswer;
private String userResponse;
public Question(String possibleQuestion ,String[] Options , String correctAnswer){ //constructor
this.possibleQuestion = possibleQuestion;
this.Options = Options;
this.correctAnswer = correctAnswer;
}
public Question(String possibleQuestion ,String[] possibleAnswer){ //constructor overloading
this.possibleQuestion = possibleQuestion;
this.Options = Options;
}
public String getquestion(){ //getter
return possibleQuestion;
}
void setquestion(String str){ //setter
possibleQuestion = str;
}
public String[] getOptions(){ //getter
return Options;
}
void setanswers(String[] str2){ //setter
Options = str2;
}
public String getAnswer(){ //getter
return correctAnswer;
}
void setans(String str3){ //setter
correctAnswer = str3;
}
public String getUserResponse() {
return userResponse;
}
public void setUserResponse(String response) {
userResponse = response;
}
public boolean isCorrect() {
return getAnswer().equals(getUserResponse());
}
}
public class QuestionPane extends JPanel {
private QuestionInterface question;
public QuestionPane(QuestionInterface question) {
this.question = question;
setLayout(new BorderLayout());
JLabel prompt = new JLabel("<html><b>" + question.getquestion() + "</b></html>");
prompt.setHorizontalAlignment(JLabel.LEFT);
add(prompt, BorderLayout.NORTH);
JPanel guesses = new JPanel(new GridBagLayout());
guesses.setBorder(new EmptyBorder(5, 5, 5, 5));
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.getAnswer());
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 QuestionInterface getQuestion() {
return question;
}
public class ActionHandler implements ActionListener {
public void actionPerformed(ActionEvent e) {
getQuestion().setUserResponse(e.getActionCommand());
}
}
}
}
答案 0 :(得分：3)
我使用的代码扩展了JDialog。我想知道是否有办法将其转换为JPanel
欢迎来到一个奇妙的世界，为什么你不应该从顶级容器扩展（或至少一个原因）
首先从MultipleChoice而不是JPanel扩展JDialog。这会产生许多编译器错误......
setModal(true);在面板上有点无意义，所以你可以摆脱它getContentPane()，面板没有JRootPane，因此它没有内容窗格。您可以使用this代替dispose。嗯，面板不是一个窗口，所以它不能被处理掉。＆＃34; 本身。我个人会用某种Observer Pattern来替换它，当测验的状态发生变化时（例如它已经完成）会提供通知，这样调用者就可以按照他们想要的方式处理它。关键是，不要假设人们可能会如何使用您的组件pack，好吧，这和其他人一样，所以你可以摆脱它。setVisible，默认情况下，Swing组件是可见的，所以它可能有点无意义。知道，您需要做的就是创建MultipleChoice面板的实例，并将其添加到您想要的容器中。
因为当我尝试运行代码时，窗口都很小，我似乎无法将完成的按钮移动到＆＃34; Next＆＃34;按钮
这是一个布局问题。在您的情况下，我会使用复合布局，可能使用FlowLayout作为按钮，使用BorderLayout作为＆＃34;问题＆＃34;和按钮面板（在SOUTH位置）。
顺便提一下，您应该使用CardLayout来显示问题，我presented in this surprisingly similar question。
另外如果我想让这个问题变得随机怎么做呢？
Collections.shuffle(questions);可能是我能想到的最简单的解决方案。一旦你打电话，List将被随机改组。
所以我只是编辑代码我想知道你是否可以发表一些评论如何解决它。谢谢
嗯，这是原始答案的背景......
List，就好像它是一个阵列一样，现在它们是如何工作的。Question（JPanel）没有实施ActionListener因此next.addActionListener(this);无法正常工作aPanel.add(responses[i]);换成循环并创建JRadioButton，这些都应添加到同一ButtonGroup Choices in Question从未分配过值，并会生成NullPointerException。我担心直接暴露MultipleChoice，并会亲自使用interface提供可以针对该类执行的内容的合同List JRadioButton Collection.shuffle，每个可能答案一个，正确答案一个，我会使用List将此Question改组为一些随机方式，然后将按钮添加到printf("%d\n", (char) (246) );
面板