JOptionPane是/否选项确认对话框问题

Question

我创造了一个JOptionPane，它只有两个按钮YES_NO_OPTION。

在JOptionPane.showConfirmDialog弹出后，我想点击YES BUTTON继续打开JFileChooser，如果我点击NO BUTTON它应该取消操作。

这似乎很容易，但我不确定我的错误在哪里。

代码片段：

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

你需要查看showConfirmDialog调用的返回值。即：

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

你正在测试dialogButton，你用它来设置应该由对话框显示的按钮，而且这个变量从未更新过 - 所以dialogButton永远不会是JOptionPane.YES_NO_OPTION以外的任何东西。

根据showConfirmDialog的Javadoc：

返回：一个整数，指示用户选择的选项

Answer 2

试试这个，

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");
}