Java 如何让 JOptionPane.showConfirmDialog 默认没有选择？
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How to make JOptionPane.showConfirmDialog have No selected by default?
提问by splintor
I implemented a Save As dialog in Java that prompts the user if the file already exists, and I want the No option to be selected by default. How do I do this?
我在 Java 中实现了一个“另存为”对话框，该对话框会提示用户文件是否已存在，并且我希望默认选择“否”选项。我该怎么做呢？
Here is my current code:
这是我当前的代码：
JFileChooser chooser = new JFileChooser()
{
public void approveSelection()
{
File selectedFile = getSelectedFile();
if (selectedFile != null && selectedFile.exists( ) )
{
int response = JOptionPane.showConfirmDialog(
this,
"The file " + selectedFile.getName() + " already exists."
+ " Do you want to replace the existing file?",
getDialogTitle(),
JOptionPane.YES_NO_OPTION,
JOptionPane.WARNING_MESSAGE);
if (response != JOptionPane.YES_OPTION )
{
return;
}
}
super.approveSelection();
}
};
采纳答案by Vinay Sajip
Use this constructor:
使用这个构造函数：
JOptionPane(Object message, int messageType, int optionType,
Icon icon, Object[] options, Object initialValue)
where optionsspecifies the buttons, and have initialValue(one of the optionsvalues) specify what the default is.
whereoptions指定按钮，并让initialValue（其中一个options值）指定默认值。
Update:You can call showOptionDialograther than showConfirmDialog. The former takes optionsand initialValueparameters.
更新：您可以调用showOptionDialog而不是showConfirmDialog. 前者需要options和initialValue参数。
回答by Carlos Tasada
That's the first thing that comes to my mind.
这是我想到的第一件事。
//Custom button text
Object[] options = {"Yes",
"No"};
JOptionPane.showOptionDialog(this, "The file " + selectedFile.getName() +
" already exists. Do you want to replace the existing file?",
getDialogTitle(),
JOptionPane.YES_NO_OPTION,
JOptionPane.WARNING_MESSAGE,
null, options, options[1]);
But probably there's a better approach.
但可能有更好的方法。
回答by Koen Weyn
If you don't want to hardcode "Yes" and "No" (for instance when your app is localized for other languages), you can use UIManager resources:
如果您不想硬编码“是”和“否”（例如当您的应用程序针对其他语言进行本地化时），您可以使用 UIManager 资源：
UIManager.getString("OptionPane.yesButtonText", l)
UIManager.getString("OptionPane.noButtonText", l)
回答by Cristian
For the above example, it is JOptionPane.showOptionDialogThose arguments can no be passed to showConfirmDialogbecause it does not have them.
对于上面的示例，JOptionPane.showOptionDialog这些参数不能传递给，showConfirmDialog因为它没有它们。
More people might be looking for this so why not offer a "working" solution.
更多的人可能正在寻找这个，所以为什么不提供一个“有效”的解决方案。
回答by subes
This is my solution:
这是我的解决方案：
import java.awt.Component;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.UIManager;
public class NegativeDefaultButtonJOptionPane {
public static int showConfirmDialog(Component parentComponent, Object message, String title, int optionType) {
List<Object> options = new ArrayList<Object>();
Object defaultOption;
switch(optionType){
case JOptionPane.OK_CANCEL_OPTION:
options.add(UIManager.getString("OptionPane.okButtonText"));
options.add(UIManager.getString("OptionPane.cancelButtonText"));
defaultOption = UIManager.getString("OptionPane.cancelButtonText");
break;
case JOptionPane.YES_NO_OPTION:
options.add(UIManager.getString("OptionPane.yesButtonText"));
options.add(UIManager.getString("OptionPane.noButtonText"));
defaultOption = UIManager.getString("OptionPane.noButtonText");
break;
case JOptionPane.YES_NO_CANCEL_OPTION:
options.add(UIManager.getString("OptionPane.yesButtonText"));
options.add(UIManager.getString("OptionPane.noButtonText"));
options.add(UIManager.getString("OptionPane.cancelButtonText"));
defaultOption = UIManager.getString("OptionPane.cancelButtonText");
break;
default:
throw new IllegalArgumentException("Unknown optionType "+optionType);
}
return JOptionPane.showOptionDialog(parentComponent, message, title, optionType, JOptionPane.QUESTION_MESSAGE, null, options.toArray(), defaultOption);
}
}
