java - 如何从创建的单选按钮类的实例中获取文本

Question

这段代码可以运行，但新的问题是我可以在每个部分中选择多个单选按钮，这是不应该发生的。

此外，它计算的分数也是错误的。请有人帮我解决它吗？谢谢!!!

import java.io.*;
import java.util.*;
import java.text.DecimalFormat;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


class Q_Panel extends JPanel
{
   //This is the radiobutton class 

   public JRadioButton one = new JRadioButton("none");
   public JRadioButton two = new JRadioButton("none");
   public JRadioButton three = new JRadioButton("none");
   public JRadioButton four = new JRadioButton("none");
   public String answer = new String("none");

   public JLabel qLabel = new JLabel("none");

   public ButtonGroup group = new ButtonGroup();

   public Q_Panel()
   {
      group.add(one);
      group.add(two);
      group.add(three);
      group.add(four);

      QuoteListener listener = new QuoteListener();
      one.addActionListener(listener);
      two.addActionListener(listener);
      three.addActionListener(listener);
      four.addActionListener(listener);

      add(qLabel);
      add(one);
      add(two);
      add(three);
      add(four);

   }

   private class QuoteListener implements ActionListener
   {
      //When I run this I do not notice it work...
      public void actionPerformed (ActionEvent event)
      {

         String selected_answer = "";
         Object source = event.getSource();

         if(source == one)
            answer = one.getText();
         else
            if(source == two)
               answer = two.getText();
            else
               if(source == three)
                  answer = three.getText();
               else
                  answer = four.getText();


         System.out.println("Answer chosen : " + selected_answer);

      }

   }
};


class radio_button
{
   //This is the the class where an instance of the radiobutton class is initialized
   public static JFrame frame;
   public static JPanel panel;
   public static JLabel qLabel;
   public static JButton Submit;
   public static Q_Panel[] qnum;
   public static String right_answer[];
   public static int Number_of_lines;
   public static String right[];



   public static void create()  
   {
      frame = new JFrame();
      frame.setTitle("Sample Radio Buttons");
      frame.setSize(500, 800);
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      qnum = new Q_Panel[10];
      right = new String[10];
      right_answer = new String[10];
      submit = new JButton("Submit");

      int y = 0;
      int i = 0;
      while( i < 10)
      {

        y = 60 * i;

        //We want to assume that the right answer is only "male"
        right_answer[i] = "male";

        qLabel = new JLabel ("Name of Exam file: " + i);
        qLabel.setBounds(10, y+20, 500, 25);
        frame.add(qLabel);

        qnum[i] = new Q_Panel();
        qnum[i].one = new JRadioButton();
        qnum[i].one.setText("male");
        qnum[i].one.setBounds(10, y+40, 150, 25);
        frame.add(qnum[i].one);

        qnum[i].two = new JRadioButton();
        qnum[i].two.setText("female");
        qnum[i].two.setBounds(10, y+60, 150, 25);
        frame.add(qnum[i].two);

        qnum[i].three = new JRadioButton();
        qnum[i].three.setText("shemale");
        qnum[i].three.setBounds(200, y+40, 400, 25);
        frame.add(qnum[i].three);

        qnum[i].four = new JRadioButton();
        qnum[i].four.setText("exmale");
        qnum[i].four.setBounds(200, y+60, 400, 25);
        frame.add(qnum[i].four);

        i++;  
      }

        submit.setBounds(400, y+80, 450, 50);
        final int v = 0;
        submit.addActionListener(new ActionListener()
        {

           public void actionPerformed(ActionEvent ae)
           {
               //This is supposed to display all the text of the buttons selected and calculate the score in comparison to the right answer.. 

               System.out.println("Submit has been pressed");            

               int right_answer_count = 0;
               int score = 0;
               String answer_chosen = "";
               boolean checked = true;
               int i = 0;

               while( i < 10)
               {
                  answer_chosen = "nil";
                  if (qnum[i].one.isSelected())
                  {
                     answer_chosen = qnum[i].one.getText();
                  }
                  else if (qnum[i].two.isSelected())
                  {
                     answer_chosen = qnum[i].two.getText();
                  }
                  else if (qnum[i].three.isSelected())
                  {
                     answer_chosen = qnum[i].three.getText();
                  }
                  else if (qnum[i].four.isSelected())
                  {
                     answer_chosen = qnum[i].four.getText();
                  }
                  else if (answer_chosen.equals("nil"))
                  {
                     checked = false;
                  }

                  if(answer_chosen.equals(right_answer[i]))
                  {
                     right_answer_count++;
                  }

                  System.out.println("Answer Chosen: " + answer_chosen);
                  System.out.println("This is the answer in qnum: "+ qnum[i].answer);

                  i++;
               }

               System.out.println("I: "+i);
               System.out.println("Count right: "+right_answer_count);
               score = (right_answer_count/i);
               System.out.println("Score: " + score);

           }
        });

        frame.add(submit);
        frame.getContentPane().add(panel);
        frame.setVisible(true);
   }

   public static void main(String args[])
   {
      create();
   }
}

Answer 1

基本答案是，您过度使用了静态...

您将 Q_Panel 中的 JRadioButton 声明为...

public static JRadioButton one = new JRadioButton("none");
public static JRadioButton two = new JRadioButton("none");
public static JRadioButton three = new JRadioButton("none");
public static JRadioButton four = new JRadioButton("none");

然后在 radio_button 类中你开始做类似的事情......

qnum = new Q_Panel[10];

qnum[i].one = new JRadioButton();
qnum[i].one.setText("male");

问题是，Q_Panel 的每个实例都使用 one、two、 Three 的最后一个实例和 four...这意味着如果您在 qnum[0] 中选择 one，则所有其他实例也将选择 one ...

删除static引用并修改代码以允许Q_Panel管理JRadio按钮。您甚至可以为 Q_Panel 提供一个方法，该方法将返回一个 int 或 String 或一个 enum 来描述什么已选择...