설정 버튼이 표시됩니다.

Question

라디오 버튼을 클릭 한 후에 void 메소드에서 "재 선택"할 수 있도록 버튼을 설정하려하지만 버튼에 대한 변수를 actionPerformed 메소드에서 사용할 수 없습니까?

public class SelectionForm extends WindowAdapter implements ActionListener { 

    void select() { 

     JFrame frame = new JFrame("Selection Form"); 

     JPanel leftPanel = new JPanel(); 
     // JPanel has BoxLayout in x-direction 
     leftPanel.setLayout(new BoxLayout(leftPanel, BoxLayout.X_AXIS)); 
     JRadioButton rd1 = new JRadioButton("Laptop"); 
     JRadioButton rd2 = new JRadioButton("Desktop"); 
     //submit button 
     JButton reselect = new JButton(" Re-select "); 
     reselect.setVisible(false); 

     // adding radio buttons in the JPanel 
     leftPanel.add(rd1); 
     leftPanel.add(rd2); 
     leftPanel.add(reselect); 

     rd1.addActionListener(this); 
     rd2.addActionListener(this); 
     //reselect button 
     reselect.addActionListener(this); 

     // add JLabels in the frame 
     frame.getContentPane().add(leftPanel); 

     frame.setSize(300, 200); 
     //frame.pack(); 
     frame.setVisible(true); 
    } 


    public void actionPerformed(ActionEvent e) { 
     System.out.println("Selected: " + e.getActionCommand()); 

     if(e.getActionCommand().equals("Laptop") || 
      (e.getActionCommand().equals("Desktop"))){ 

      //OnlineShop oS = new OnlineShop(); 
      // oS.onlineShop(); 

      reselect.setVisible(true); 
     } 
    } 

} 

class MyWindowListener extends WindowAdapter { 

    public void windowClosing(WindowEvent e) { 
     System.out.println("Closing window!"); 
     System.exit(0); 

    } 
} 

Answer 1

버튼 바깥 쪽을 메서드 바깥에 배치합니다. 이렇게 :

public class SelectionForm extends WindowAdapter implements ActionListener 
{ 
    private JButton reselect; 
    void select() { 

     ... 
     //submit button 
     reselect = new JButton(" Re-select "); 
     reselect.setVisible(false); 


     .... 
    } 


    public void actionPerformed(ActionEvent e) { 
     System.out.println("Selected: " + e.getActionCommand()); 

     if(e.getActionCommand().equals("Laptop") || (e.getActionCommand().equals("Desktop"))){ 

      //OnlineShop oS = new OnlineShop(); 
      // oS.onlineShop(); 

      reselect.setVisible(true); 
     } 
    } 

} 

class MyWindowListener extends WindowAdapter { 

    public void windowClosing(WindowEvent e) { 
     System.out.println("Closing window!"); 
     System.exit(0); 

    } 
}