JOptionPane是/否选项确认对话框问题

Question

我创建了一个JOptionPane它只有两个按钮YES_NO_OPTION.

后JOptionPane.showConfirmDialog弹出,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

您需要查看调用的返回值showConfirmDialog.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
}

您正在测试dialogButton,您正在使用它来设置应该由对话框显示的按钮,并且此变量从未更新过 - 所以dialogButton除了之外永远不会有任何变化JOptionPane.YES_NO_OPTION.

根据Javadoc showConfirmDialog:

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");
}