如何使JOptionPane.showConfirmDialog默认没有选中？

Question

我在Java中实现了一个"另存为"对话框,提示用户文件是否已存在,并且我希望默认情况下选择"否"选项.我该怎么做呢？

这是我目前的代码:

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();
    }
};

Answer 1

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]);

但可能有更好的方法.

Answer 2

使用此构造函数:

JOptionPane(Object message, int messageType, int optionType,
            Icon icon, Object[] options, Object initialValue)

where options指定按钮,并具有initialValue(其中一个options值)指定默认值.

更新:你可以打电话showOptionDialog而不是showConfirmDialog.前者采取options和initialValue参数.

Answer 3

如果您不想硬编码"是"和"否"(例如,当您的应用程序本地化为其他语言时),您可以使用UIManager资源:

UIManager.getString("OptionPane.yesButtonText", l)
UIManager.getString("OptionPane.noButtonText", l)

Answer 4

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);
}

}