Dino`s Note

參考答案

import java.awt.event.*;
import javax.swing.*;

 
class JDD01
{   
        public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MyJFrame().setVisible(true);
            }
        });
    }
}

class MyJFrame extends javax.swing.JFrame {
    private ButtonGroup answers;
    private JRadioButton baseball;
    private JRadioButton basketball;
    private JRadioButton tennis;
    private JRadioButton other;
    private JButton okBtn;
    private JTextField otherBallGame;
    private JLabel question;
    private String favoriteBallGame="棒球"; 
    
    public MyJFrame() {
        answers = new ButtonGroup();
        okBtn = new JButton();
        question = new JLabel();
        baseball = new JRadioButton();
        basketball = new JRadioButton();
        tennis = new JRadioButton();
        other = new JRadioButton();
        otherBallGame = new JTextField();

        setSize(340,290);
        setLocationRelativeTo(null);
        setLayout(null);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setTitle("問卷調查");
        

        okBtn.setText("確定");
        okBtn.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent evt){
                String tmp;
                
                if(favoriteBallGame.equals(""))
                    tmp = otherBallGame.getText();
                else
                    tmp = favoriteBallGame;
                JOptionPane.showMessageDialog(MyJFrame.this, "你最喜好的球類運動是"+tmp,"test",JOptionPane.INFORMATION_MESSAGE);
                
            }
        });
        
        question.setText("下列何者是您最喜好的球類運動？(單選)");

        answers.add(baseball);
        baseball.setText("棒球");
        baseball.setSelected(true);
        
        baseball.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent evt){
                otherBallGame.setEnabled(false);
                favoriteBallGame="棒球";
            }
        });

        answers.add(basketball);
        basketball.setText("籃球");
        basketball.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent evt)
            {
                otherBallGame.setEnabled(false);
                favoriteBallGame="籃球";
            }
        });    

        answers.add(tennis);
        tennis.setText("網球");
        tennis.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent evt){
                otherBallGame.setEnabled(false);
                favoriteBallGame="網球";
            }
        });

        answers.add(other);
        other.setText("其它");
        other.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent evt){
                otherBallGame.setEnabled(true);
                favoriteBallGame = "";
            }
        });
        
        otherBallGame.setEnabled(false);
        
        question.setSize(240, 30);
        question.setLocation(50,20);        
        baseball.setSize(100,30);
        baseball.setLocation(50,50);
        basketball.setSize(100,30);
        basketball.setLocation(50,80);
        tennis.setSize(100,30);
        tennis.setLocation(50,110);
        other.setSize(70,30);
        other.setLocation(50, 140);
        otherBallGame.setSize(100,20);
        otherBallGame.setLocation(120, 145);
        
        okBtn.setSize(100,20);
        okBtn.setLocation(120, 200);
        
        getContentPane().add(question);
        getContentPane().add(baseball);
        getContentPane().add(basketball);
        getContentPane().add(tennis);
        getContentPane().add(other);
        getContentPane().add(otherBallGame);
        getContentPane().add(okBtn);        
    }
}

執行結果