public class test{
    public static void main(String[] args){

        //default icon, custom title
        int n = JOptionPane.showConfirmDialog(
            null,
            "Would you like green eggs and ham?",
            "An Inane Question",
            JOptionPane.YES_NO_OPTION);

        if(true){
            JOptionPane.showMessageDialog(null, "HELLO");
        }
        else {
            JOptionPane.showMessageDialog(null, "GOODBYE");
        }

        System.exit(0);
    }
}

int reply = JOptionPane.showConfirmDialog(null, message, title, JOptionPane.YES_NO_OPTION);
        if (reply == JOptionPane.YES_OPTION) {
          JOptionPane.showMessageDialog(null, "HELLO");
        }
        else {
           JOptionPane.showMessageDialog(null, "GOODBYE");
           System.exit(0);
        }

if(n == JOptionPane.YES_OPTION)
{
    JOptionPane.showMessageDialog(null, "HELLO");
}
else
{
    JOptionPane.showMessageDialog(null, "GOODBYE");
}

int test = JOptionPane.showConfirmDialog(null, "Would you like green eggs and ham?", "An insane question!");
switch(test) {
    case 0: JOptionPane.showMessageDialog(null, "HELLO!"); //Yes option
    case 1: JOptionPane.showMessageDialog(null, "GOODBYE!"); //No option
    case 2: JOptionPane.showMessageDialog(null, "GOODBYE!"); //Cancel option
}

int n = JOptionPane.showConfirmDialog(
                null,
                "sample question?!" ,
                "",
                JOptionPane.YES_NO_OPTION);

      if(n == JOptionPane.YES_OPTION)
      {
          JOptionPane.showMessageDialog(null, "Opening...");
      }
      else
      {
          JOptionPane.showMessageDialog(null, "Goodbye");
          System.exit(0);

//default icon, custom title
int n = JOptionPane.showConfirmDialog(null,"Would you like green eggs and ham?","An Inane Question",JOptionPane.YES_NO_OPTION);

String result = "?";
switch (n) {
case JOptionPane.YES_OPTION:
  result = "YES";
  break;
case JOptionPane.NO_OPTION:
  result = "NO";
  break;
default:
  ;
}
System.out.println("Replace? " + result);

int n = JOptionPane.showConfirmDialog(null, "Yes No Cancel", "YesNoCancel", JOptionPane.YES_NO_CANCEL_OPTION);
    if(n == 0)
        {
        JOptionPane.showConfirmDialog(null, "You pressed YESn"+"Pressed value is = "+n);
        }
    else if(n == 1)
        {
        JOptionPane.showConfirmDialog(null, "You pressed NOn"+"Pressed value is = "+n);
        }
    else if (n == 2)
        {
        JOptionPane.showConfirmDialog(null, "You pressed CANCELn"+"Pressed value is = "+n);
        }
    else if (n == -1)
        {
        JOptionPane.showConfirmDialog(null, "You pressed Xn"+"Pressed value is = "+n);
        }

int n = JOptionPane.showConfirmDialog(null, "Yes No Cancel", "YesNoCancel", JOptionPane.YES_NO_CANCEL_OPTION);
    switch (n) {
        case 0:
            JOptionPane.showConfirmDialog(null, "You pressed YESn"+"Pressed value is = "+n);
            break;
        case 1:
            JOptionPane.showConfirmDialog(null, "You pressed NOn"+"Pressed value is = "+n);
            break;
        case 2:
            JOptionPane.showConfirmDialog(null, "You pressed CANCELn"+"Pressed value is = "+n);
            break;
        case -1:
            JOptionPane.showConfirmDialog(null, "You pressed Xn"+"Pressed value is = "+n);
            break;
        default:
            break;
    }