java 获取 JOptionPane 的返回值
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/1215436/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Get the return value of JOptionPane
提问by burntsugar
My JOptionPane code is as follows:
我的 JOptionPane 代码如下：
selectedSiteName = JOptionPane.showInputDialog("Enter the name of the new site:");
This renders out an input with a textbox and an OK and Cancel button. I need to detect if Cancel was clicked.
这将呈现一个带有文本框和 OK 和 Cancel 按钮的输入。我需要检测是否单击了取消。
Cheers.
干杯。
回答by Jataro
Check if selectedSiteName == null .
This will be the case if the user clicks Cancel or closes the dialog.
检查是否 selectedSiteName == null 。
如果用户单击取消或关闭对话框，就会出现这种情况。
回答by camickr
Read the JOptionPane API and follow the link to the Swing turorial on "How to Use Dialogs" for a working example.
阅读 JOptionPane API 并按照“如何使用对话框”的 Swing 教程链接获取工作示例。
回答by Nick Gibson
if(selectedSiteName == JOptionPane.CANCEL_OPTION)
{
}
should work.
应该管用。
回答by Jakub Iskerka
JOptionPane extends JComponent.
JOptionPane 扩展了 JComponent。
Methods of JOptionPane
1) .showMessageDialog(); // VOID :-(
2) .showInputDialog(); // return STRING :-)
3) .showConfirmDialog(); // return int :-)
-> and more...
JOptionPane 的方法
1) .showMessageDialog(); // 无效 :-(
2) .showInputDialog(); // 返回字符串 :-)
3) .showConfirmDialog(); // 返回 int :-)
-> 等等...
Example:
例子：
void myMethod() {
JDialog jd = new JDialog();
jd.setDefaultCloseOperation(1);
JOptionPane jop = new JOptionPane();
int val = jop.showConfirmDialog(jd, "Hello");
if(val == 0) jop.showMessageDialog(null, "Success", "INFO", jop.INFORMATION_MESSAGE);
System.out.println(val);
jd.add(jop);
}
Helpful link:
- Why does JOptionPane.getValue() continue to return uninitializedValue
- https://docs.oracle.com/javase/7/docs/api/javax/swing/JOptionPane.html
有用的链接：
-为什么 JOptionPane.getValue() 继续返回 uninitializedValue
- https://docs.oracle.com/javase/7/docs/api/javax/swing/JOptionPane.html
