從方法

Question

關閉ConfirmDialog

我有一些類與2方法。第一種方法是調用確認對話框，第二種是線程偵聽器等待完成狀態。如果偵聽器被執行，我想關閉確認對話框。可能嗎？

我的代碼：

public class NewNetworkGame implements ThreadListener { 

ReadMsg read; 
Network net; 
// my dialog 
JOptionPane cancelDialog; 

boolean accepted = false; 
boolean readStopped = false; 

public NewNetworkGame(Network net) { 
    this.net = net; 
    read = new ReadMsg(this.net); 
    ThreadHandler rm = read; 
    rm.addListener(this); 
    rm.start(); 

    JPanel cancelConn = new JPanel(); 
    cancelConn.add(new JLabel("Waiting for host response...")); 

    // showing dialog 
    int result = cancelDialog.showConfirmDialog(null, cancelConn, "Host response", JOptionPane.CANCEL_OPTION); 
    // client clicked on cancel option while thread is still reading host response  
    if (result == JOptionPane.CANCEL_OPTION && !accepted && !readStopped) { 
     net.sendReject(); 
    } 

    if (!readStopped) { 
     read.interrupt(); 
    } 

} 

@Override 
public void notifyOfThreadComplete(Thread thread) { 

    readStopped = true; 

    if (net.getAcceptMsg().equals(read.getStr())) { 
     accepted = true; 
    } 

    // closing dialog 
    cancelDialog.setValue(JOptionPane.CANCEL_OPTION); 
    // generates: java.lang.NullPointerException 
} 

} 

我在聽衆處理器獲得java.lang.NullPointerException從cancelDialog.setValue(JOptionPane.CANCEL_OPTION)。你能幫助任何人如何關閉確認對話框嗎？

更新與解決方案。 工作代碼：

public class NewNetworkGame implements ThreadListener { 

ReadMsg read; 
Network net; 

boolean accepted = false; 
boolean readStopped = false; 

final JDialog dialog = new JDialog(); 


public NewNetworkGame(Network net) { 
    this.net = net; 
    read = new ReadMsg(this.net); 
    ThreadHandler rm = read; 
    rm.addListener(this); 
    rm.start(); 


    JPanel cancelConn = new JPanel(); 
    cancelConn.add(new JLabel("Waiting for host response...")); 
    Object[] options = {"Abort"}; 

    JOptionPane.showOptionDialog(dialog, cancelConn, "Host response", JOptionPane.CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, null, options, options[0]);   

    System.out.println("clicked"); 

    if (!accepted && !readStopped) { 
     System.out.println("aborted"); 
     net.sendReject(); 
    } 

    if (!readStopped) { 
     read.interrupt(); 
    } 

} 

@Override 
public void notifyOfThreadComplete(Thread thread) { 

    readStopped = true; 

    if (net.getAcceptMsg().equals(read.getStr())) { 
     accepted = true; 
    } 

    dialog.setVisible(false); 

} 

} 

Answer 1

嘗試用代碼

@Override 
    public void notifyOfThreadComplete(Thread thread) { 

     readStopped = true; 

     if (net.getAcceptMsg().equals(read.getStr())) { 
      accepted = true; 
     } 

     // closing dialog 
     if(cancelDialog != null) 
      { 
     cancelDialog.setValue(JOptionPane.CANCEL_OPTION); 
     } 

}