JOptionPane是/否選項確認對話框問題

Question

我創建了一個JOptionPane ，它只有兩個按鈕YES_NO_OPTION 。

彈出JOptionPane.showConfirmDialog后，我想點擊YES BUTTON繼續打開JFileChooser ，如果我點擊NO BUTTON它應該取消操作。

這似乎很容易，但我不確定我的錯誤在哪里。

代碼片段：

if (textArea.getLineCount() >= 1) {  //The condition to show the dialog if there is text inside the textArea

    int dialogButton = JOptionPane.YES_NO_OPTION;
    JOptionPane.showConfirmDialog (null, "Would You Like to Save your Previous Note First?","Warning",dialogButton);

    if (dialogButton == JOptionPane.YES_OPTION) { //The ISSUE is here

    JFileChooser saveFile = new JFileChooser();
    int saveOption = saveFile.showSaveDialog(frame);
    if(saveOption == JFileChooser.APPROVE_OPTION) {

    try {
        BufferedWriter fileWriter = new BufferedWriter(new FileWriter(saveFile.getSelectedFile().getPath()));
        fileWriter.write(textArea.getText());
        fileWriter.close();
    } catch(Exception ex) {

    }
}

Answer 1

您需要查看對showConfirmDialog的調用的返回值。 IE：

int dialogResult = JOptionPane.showConfirmDialog (null, "Would You Like to Save your Previous Note First?","Warning",dialogButton);
if(dialogResult == JOptionPane.YES_OPTION){
  // Saving code here
}

你正在測試dialogButton ，你用它來設置對話框應該顯示的按鈕，而且這個變量從未更新過 - 所以dialogButton永遠不會是JOptionPane.YES_NO_OPTION以外的任何東西。

根據showConfirmDialog的Javadoc：

返回：一個整數，指示用戶選擇的選項

Answer 2

試試這個，

int dialogButton = JOptionPane.YES_NO_OPTION;
int dialogResult = JOptionPane.showConfirmDialog(this, "Your Message", "Title on Box", dialogButton);
if(dialogResult == 0) {
  System.out.println("Yes option");
} else {
  System.out.println("No Option");
} 

Answer 3

int opcion = JOptionPane.showConfirmDialog(null, "Realmente deseas salir?", "Aviso", JOptionPane.YES_NO_OPTION);

if (opcion == 0) { //The ISSUE is here
   System.out.print("si");
} else {
   System.out.print("no");
}