While loop for jpg

[TheBigB]

How am I able to run a while loop with JOptionPane.showInputDialog to open pictures and then crash when nothing is entered. I just started using java, so any help would be useful. This is what I have now.

static String show(String message, Object initValue) {
String reply = null;
if(initValue==null) reply=JOptionPane.showInputDialog(message);
else reply=JOptionPane.showInputDialog(message, initValue);
return reply;
}

public static void main(String[] args) {
String s;
s = show("Enter file name", null);
System.out.println(s);
while(s != ""){
System.out.println(s);
s = show("Enter file name", null);
}
}
}

[Norm]

then crash when nothing is entered

Please copy and paste full text of the error message here.