Question

我创建了JOptionPane类型showInputDialog。当它打开时，它会显示两个按钮：确定和取消。当我按取消按钮时，我想处理动作，但我不知道如何触及它。我怎么能得到它？

Answer 1

例如：

int n = JOptionPane.showConfirmDialog(
                            frame, "Would you like green eggs and ham?",
                            "An Inane Question",
                            JOptionPane.YES_NO_OPTION);
if (n == JOptionPane.YES_OPTION) {

} else if (n == JOptionPane.NO_OPTION) {

} else {

}

或者使用showOptionDialog：

Object[] options = {"Yes, please", "No way!"};
int n = JOptionPane.showOptionDialog(frame,
                "Would you like green eggs and ham?",
                "A Silly Question",
                JOptionPane.YES_NO_OPTION,
                JOptionPane.QUESTION_MESSAGE,
                null,
                options,
                options[0]);
if (n == JOptionPane.YES_OPTION) {

} else if (n == JOptionPane.NO_OPTION) {

} else {

}

有关详细信息，请参阅How to Make Dialogs。

编辑：showInputDialog

String response = JOptionPane.showInputDialog(owner, "Input:", "");
if ((response != null) && (response.length() > 0)) {

}

Answer 2

showMessageDialog不应显示两个按钮，因此您的代码或对其的解释会出现问题。无论如何，如果你想给用户一个选择并想要检测那个选择，不要使用showMessageDialog而是使用showConfirmDialog，并返回int并测试它以查看它是否为JOptoinPane.OK_OPTION。

Answer 3

这是一个老问题，我是一个Java新手，所以可能有更好的解决方案，但我想知道相同的，也许它可以帮助其他人，我做的是检查响应是否为空。< / p>

这对我有用：

//inputdialog 
    JOptionPane inpOption = new JOptionPane();

    //Shows a inputdialog
    String strDialogResponse = inpOption.showInputDialog("Enter a number: "); 

    //if OK is pushed then (if not strDialogResponse is null)
    if (strDialogResponse != null){

        (Code to do something if the user push OK)  

    }
    //If cancel button is pressed
    else{

        (Code to do something if the user push Cancel)

    }

Answer 4

package Joptionpane;

import javax.swing.JOptionPane;

public class Cancle_on_JOptionPane {

    public static void main(String[] args) {
        String s;
        int i;
        for (i=0;i<100;i++){
            s = JOptionPane.showInputDialog(null,"What is your favorite fruit ?");
            try {
                if (s.equals("")) {
                    JOptionPane.showMessageDialog(null," Enter your answer !!!"," ^-^ Information^-^ ",JOptionPane.INFORMATION_MESSAGE);
                    i=2;
                } else {
                    JOptionPane.showMessageDialog(null," s = "+s," ^-^ Information^-^ ",JOptionPane.INFORMATION_MESSAGE);
                    i=100;
                }
            }
            catch (Exception e) {
                JOptionPane.showMessageDialog(null,"Cancle answer !!!"," ^-^ Information^-^ ",JOptionPane.INFORMATION_MESSAGE);
                i=100;
            }
        }
    }
}

Answer 5

你可以这样做：

>>> 1,2,3,4,5,6,7,8,9
>>> 10,11,12,13,14,15,16,17,18,19
>>> 20,21,23,24,25,26,27,28,29

Answer 6

这可能是你的答案：

package Joptionpane;

import javax.swing.JOptionPane;

public class Cancle_on_JOptionPane {

    public static void main(String[] args) {
        String s;
        int i;
        for(i=0;i<100;i++){
        s = JOptionPane.showInputDialog(null,"What is your favorite fruit ?");
                        try{
                                 if(s.equals(""))  {
                                                            JOptionPane.showMessageDialog(null," Enter your answer !!!"," ^-^ Information^-^ ",JOptionPane.INFORMATION_MESSAGE);
                                                            i=2;
                                                       }
                                 else  {
                                           JOptionPane.showMessageDialog(null," s = "+s," ^-^ Information^-^ ",JOptionPane.INFORMATION_MESSAGE);
                                           i=100;
                                         }
                            }
        catch(Exception e)
              {
                 JOptionPane.showMessageDialog(null,"Cancle answer !!!"," ^-^ Information^-^ ",JOptionPane.INFORMATION_MESSAGE);
                 i=100;
              }
     }
   }
}

如何处理JOptionPane中的取消按钮

6 个答案: