What kind of Java syntax is “= = null? False: true;”

I'm looking at the code and wondering what this means:

Boolean foo = request.getParameter("foo") == null? false:true;

It must be something that converts the returned string from getparameter () to a Boolean value

But I've never seen such a java with question marks and colons (except in the foreach loop) Any appreciation!

Solution

This is a ternary operator Clip:

Boolean foo = request.getParameter("foo") == null? false:true;

amount to:

Boolean foo;
if (request.getParameter("foo") == null)
    foo = false;
else
    foo = true;

Or (optimized):

Boolean foo = request.getParameter("foo") != null;

The basic form of the operator is:

(condition) ? (value if condition true) : (value if condition false)