java – JOptionPane是/否选项确认对话框问题

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

弹出JOptionPane.showConfirmDialog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) {

    }
}

解决方法:

您需要查看对showConfirmDialog的调用的返回值.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dialogBu​​tton,你用它来设置对话框应该显示的按钮,而且这个变量从未更新过 – 所以dialogBu​​tton永远不会是JOptionPane.YES_NO_OPTION以外的任何东西.

根据showConfirmDialog的Javadoc：

Returns: an integer indicating the option selected by the user

标签：jfilechooser,java,swing
来源： https://codeday.me/bug/20190930/1834672.html