Java-在radioButtons和JPanel中使用IsSelected函数 [英] Java - using a IsSelected function in radioButtons and JPanel
问题描述
我必须使用 JPanel 和 JRadioButton 在Java中设置测验。
I have to set a "quiz" in Java, using JPanel and JRadioButton.
我的代码首先从文件中读取文本并将其放在面板上，并带有单选按钮，按钮组和面板。到目前为止，一切都很好。
My code starts with reading a text from a file and putting it on a panel, with radio buttons, button groups and panel. So far, so good.
但是，当我不得不从用户那里收集数据并将其与正确答案进行比较时，我的问题就开始了。
However my problem starts when I have to collect the data from the user and compare it with the right answers.
我上课有问题，答案和阅读（除了主要内容和面板上的显示内容）。
I have class Questions, Answers and Read (besides main and display on panel).
我的思考方式是当用户单击时点击代码中的提交按钮以查看测验。但是，当我在打开的窗口中单击它时，什么也不会发生。
My way of thinking was that when the user clicks the submit button the code stars to check to quiz. However, nothing happens when I click it on the window opened.
我将数据收集到 ArrayList 进行比较。
I collect the data to ArrayList for comparison.
应该在用户提交测验后调用 checkQuiz 方法。它将单选按钮选择的文本与答案进行比较。在用户单击提交按钮之前，该程序应该一直在运行，但是我相信它不会发生。
The checkQuiz method is supposed to be called after the user submits the quiz. It compares the radio button selected text with an answer. The program is supposed to be "running" until the user clicks the "submit" button, however I believe it does not happen.
我尝试使用 ActionListener ，但是我无法将用户的选择与正在使用的数据进行比较。
I tried to use ActionListener in the code but I couldn't compare the user's choice with the data I am using.
对不起大量的代码。我尝试发布一个mcve问题。据我所知，该代码是可编译的，但我再也不能忽略了。
I am sorry for the lots of code. I tried to post a mcve question. As far as I know the code is compilable, but I couldn't neglect any more lines.
感谢您的帮助，代码如下。
Thank you for your help, and the code is below.
类DisplayOnPanel创建一个框架供子类使用：
import javax.swing.JFrame;
public class DisplayOnPanel extends JFrame {
JFrame frame = new JFrame();
public DisplayOnPanel(){
frame.setSize(500,500);
}
}
主要班级：
public class Main {
public static void main (String[]args){
new Read();
}
}
Clsas问题：
public class Question {
private String _question;
private String _option1;
private String _option2;
private String _option3;
private String _option4;
private int _qIndex=0;
public Question(String question, String option1, String option2, String option3,
String option4){
this._question = question;
this._option1 = option1;
this._option2 = option2;
this._option3 = option3;
this._option4 = option4;
}
public void set_qIndex(int index) {
this._qIndex = index;
}
类读取-读取文件，然后在面板上显示结果。
Class Read - Reads from a file and then displays the results on the panel. It also fills ArrayLists with Answers, Questions, ButtonGroups and JPanels.
import javax.swing.*;
import java.awt.*;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;
public class Read extends DisplayOnPanel {
protected ArrayList<Question> Questions = new ArrayList<>();
protected ArrayList<ButtonGroup> BG = new ArrayList<>();
protected ArrayList<JPanel> JP = new ArrayList<>();
protected ArrayList<Answer> Answers = new ArrayList<>();
protected int qNumber = 0, finalscore = 0;
private JLabel lblScore;
private JToggleButton Submit = new JToggleButton();
//constructor
public Read() {
super();
//a "label" in the file will indicate the final score
final int NUMBER_OF_LABELS_ADDED_TO_FRAME = 1;
int number_of_lines_in_the_file, final_score = 0;
try {
number_of_lines_in_the_file = read(Questions);
addButtonsToFrame(Questions, number_of_lines_in_the_file +
NUMBER_OF_LABELS_ADDED_TO_FRAME, BG, JP);
Submit.setText("Submit Quiz"); //create a submit button
JPanel SubmitPanel = new JPanel();
SubmitPanel.setVisible(true);
this.add(SubmitPanel);
SubmitPanel.add(Submit);
Submit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
for (int i = 0; i < BG.size(); i++) {
//handle cases of the user didn't complete the test
if (BG.get(i).getSelection()==null) {
JOptionPane.showMessageDialog(frame, "Exam not finished - Restart.");
i=BG.size()-1; //finish the loop
frame.setVisible(false);
dispose();
new Read();
}
}
checkQuiz(BG, Answers, ONE_QUESTION_GRADE); //check quiz
Submit.setEnabled(false); //can't redo quiz //
// unless "Restart" pressed
}
});
//adding final score label
lblScore = new JLabel("Your Final Score: " + finalscore);
add(lblScore);
pack();
this.setVisible(true);
while (!Submit.isSelected()) {
if (Submit.isSelected()) {
checkQuiz(BG, Answers);
}
}
} catch (FileNotFoundException e) {
System.out.println("couldn't open file");
}
}
//the method reads from the file
//returns the number of lines (quesiton) in the file
public int read(ArrayList<Question> Questions) throws FileNotFoundException {
int number_of_lines = 0;
try {
File f = new File("C:\\Users\\Assaf\\Desktop\\exam.txt");
Scanner input = new Scanner(f);
//read from file direcly into the constructor
while (input.hasNext()) {
Question q = new Question((input.nextLine())
, (input.nextLine()),
(input.nextLine()),
(input.nextLine()),
(input.nextLine()));
//adding the question and the answers to an array
Questions.add(q);
number_of_lines++;
q.set_qIndex(number_of_lines);
Answers.add(new Answer(q));
}
input.close();
} catch (FileNotFoundException nf) {
System.out.println("couldn't open file");
}
//return number of lines in the file
return number_of_lines;
}
public void addButtonsToFrame(ArrayList<Question> q, int number_of_lines,
ArrayList<ButtonGroup> BG, ArrayList<JPanel> JP) {
int j = 0;
for (int i = 0; i < q.size(); i++) {
qNumber = i;
BG.add(new ButtonGroup());
JP.add(new JPanel());
JP.get(i).setSize(499, 400);
//creating buttons
JRadioButton option1 = new JRadioButton(q.get(i).get_option1());
option1.setActionCommand(q.get(i).get_option1());
JRadioButton option2 = new JRadioButton(q.get(i).get_option2());
option2.setActionCommand(q.get(i).get_option2());
JRadioButton option3 = new JRadioButton(q.get(i).get_option3());
option3.setActionCommand(q.get(i).get_option3());
JRadioButton option4 = new JRadioButton(q.get(i).get_option4());
option4.setActionCommand(q.get(i).get_option4());
//adding to group buttons
BG.get(j).add(option1);
BG.get(j).add(option2);
BG.get(j).add(option3);
BG.get(j).add(option4);
//adding the buttons to the panel
JP.get(j).add(option1);
JP.get(j).add(option2);
JP.get(j).add(option3);
JP.get(j).add(option4);
//setting layout that matches our goal
this.setLayout(new GridLayout(number_of_lines + 1, 1));
//set title and border for each question
JP.get(i).setBorder(BorderFactory.createTitledBorder(
BorderFactory.createEtchedBorder(), "question number " + qNumber + ": " + q.get(i).get_question()));
//adding the panel to the frame
this.add(JP.get(j));
//BG.get(i).getSelection()
JP.get(j).setVisible(true);
j++;
}
}
public void checkQuiz(ArrayList<ButtonGroup> BG, ArrayList<Answer> A) {
ArrayList<String> Selections = new ArrayList<>();
int CORRECT_ANSWER = 0;
for (int i = 0; i < BG.size(); i++) {
if (BG.get(i).getSelection().getActionCommand()
.compareTo(A.get(i).get_answer()) == CORRECT_ANSWER) {
finalscore = finalscore + 10;
}
}
}
类答案
public class Answer {
private String _question;
private String _answer;
private int _qIndex=0;
public Answer (Question q){
this._answer = q.get_option1();
this._question=q.get_question();
this._qIndex=q.get_qIndex();
}
编辑-
发布了我的工作代码。
Edit - posted my working code.
推荐答案
i）您需要先设置操作命令，然后再
i) You need to set action command before getting it,
JRadioButton option1 = new JRadioButton(q.get(i).get_option1());
option1.setActionCommand(q.get(i).get_option1());
JRadioButton option2 = new JRadioButton(q.get(i).get_option2());
option2.setActionCommand(q.get(i).get_option2());
JRadioButton option3 = new JRadioButton(q.get(i).get_option3());
option3.setActionCommand(q.get(i).get_option3());
JRadioButton option4 = new JRadioButton(q.get(i).get_option4());
option4.setActionCommand(q.get(i).get_option4());
ii）您尚未在<$ c $的末尾设置标签的最终分数c> checkQuiz 方法，
lblScore.setText（您的最终分数： +最终分数）;
ii) You haven't set the final score in your label in the end of checkQuiz method,
lblScore.setText("Your Final Score: " + finalscore);
iii）建议不要使用 while 循环。同样，在大多数情况下， checkQuiz 方法不会使用您当前使用的逻辑来调用。因此，使用 ActionListener 接口代替 while
iii) It is not advisable to use a while loop. Also checkQuiz method will not be invoked most of the time with the current logic you use. Hence use an ActionListener interface instead of a while,
Submit.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
checkQuiz(BG, Answers);
}
});
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