java JOptionPane如何禁用X？

Question

如果用户单击右上角的X，我不希望发生任何事情。实现这一点的代码行是什么

Object [] options1 = {"Go Back", "Accept"};
 int a3 =JOptionPane.showOptionDialog(null,"Mean arterial pressure restored.\nReassess all vitals STAT.", "Title", JOptionPane.YES_NO_OPTION, JOptionPane.PLAIN_MESSAGE, null, options1, options1[0]);

 if(a3 == JOptionPane.CLOSED_OPTION)
{
 //what should i put here? if user X out, I want no response (DO_NOTHING_ON_CLOSE)
 }

 if(a3 == JOptionPane.YES_OPTION)
{ 
// doing something else
 }

if (a3 == JOptionPane.NO_OPTION)
{
//doing something else
}

我试过a3之类的。setDefaultCloseOperation（WindowConstants.DO_NOTHING_ON_CLOSE）； 但我得到一个错误int不能被解引用

Answer 1

这段代码可能会起作用（您可以运行代码来测试它）：

import javax.swing.*;  
import java.awt.*;  
import java.awt.event.*;  
class Testing  
{  
  public void buildGUI()  
  {  
    JFrame.setDefaultLookAndFeelDecorated(true);  
    JFrame f = new JFrame();  
    f.setResizable(false);  
    removeMinMaxClose(f);  
    JPanel p = new JPanel(new GridBagLayout());  
    JButton btn = new JButton("Exit");  
    p.add(btn,new GridBagConstraints());  
    f.getContentPane().add(p);  
    f.setSize(400,300);  
    f.setLocationRelativeTo(null);  
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
    f.setVisible(true);  
    btn.addActionListener(new ActionListener(){  
      public void actionPerformed(ActionEvent ae){  
        System.exit(0);  
      }  
    });  
  }  
  public void removeMinMaxClose(Component comp)  
  {  
    if(comp instanceof AbstractButton)  
    {  
      comp.getParent().remove(comp);  
    }  
    if (comp instanceof Container)  
    {  
      Component[] comps = ((Container)comp).getComponents();  
      for(int x = 0, y = comps.length; x < y; x++)  
      {  
        removeMinMaxClose(comps[x]);  
      }  
    }  
  }  
  public static void main(String[] args)  
  {  
    SwingUtilities.invokeLater(new Runnable(){  
      public void run(){  
        new Testing().buildGUI();  
      }  
    });  
  }  
}  

Answer 2

那么这种极简主义的方法呢：

Object [] options1 = {"Go Back", "Accept"};

do {
    a3 = JOptionPane.showOptionDialog(null,"Mean arterial pressure restored.\nReassess all vitals STAT.", "Title", JOptionPane.YES_NO_OPTION, JOptionPane.PLAIN_MESSAGE, null, options1, options1[0]);
} while(a3 == JOptionPane.CLOSED_OPTION);

if (a3 == JOptionPane.YES_OPTION) { 
    // doing something else
}

if (a3 == JOptionPane.NO_OPTION) {
    //doing something else
}