填空题

以下程序产生一个确认对话框。
import javax.swing.*;
public class Class30
{
public static void main(String[ ] args)
{
JFrame win=new JFrame( );
win.setBounds(100,100,200,300);
win.setVisible(true);
win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
int resule=______.______(win,"真的要退出吗","是否退出",0);
System.out.println(resule);
}
}