Why would you expect an error message? This is analogous to writing:
boolean b;
if (true) {
   if (false) {
       b = true;
   } else {
       b = false;
   }
} else {
   b = true;
}

Obviously b will be false.

It's all about operator precedence:
 boolean b = true ? (false ? true : false) : true;

The expression:
 false ? true : false
evaluates to
 false

The simplified expression:
 true ? (false) : true
evaluates to
 false

"Irlan agous" wrote...

With some logic applied, the answer actually *is* in teh tutorial...

The conditional operator works in this way:

  condition : value-if-true : value-if-false

I guess you follow me so far?

Anyway, anything that can give a value can be put in the places for
value-if-true or value-if-false, even another conditional operator!

If I put a couple of parenthesis around it, maybe you can see what is going
on. The parenthesis isn't necessary, but can add clarity:

  boolean b = true ? (false ? true : false) : true;

So what does your example more precisely do?

- The condition for the "inner" one, is "false", which
 means that the value of *that* statement is false, which
 means that after that statement is performed, the
 conditional operator statement now is:

 boolean b = true ? (false) : true;

As the *condition* is true, the first value is selected, which makes the
value of the whole statement "false".

// Bjorn A

You don't understand the ternary operator?

   condition ? value1 : value2

if condition evaluates to true
the expression evaluates to value1
otherwise it evaluates to value2.

Take
  boolean b = true ? false ? true : false : true;
reformat for readability
  boolean b = true ? ( false ? true : false ) : true;
evaluate the inner ternary expression
  ( false ? true : false )
gives
  false
and subsequently
  boolean b = true ? ( false ) : true;
evaluates to
  boolean b = false;