Reading Swing code and learning Java

Browsing the code for BasicScrollBarUI (yes, i don't have a life), i was puzzled by the following lines:

  (ltr ? decrButton : incrButton).setBounds(leftButtonX, 
     itemY, leftButtonW, itemH);
  (ltr ? incrButton : decrButton).setBounds(rightButtonX, 
     itemY, rightButtonW, itemH);

Say what? I had no idea that the ternary conditional operator can appear as a primary expression (JLS 15.8) followed by the method invocation. Well - it can (according to the 15.25 of JLS). Finally I have something to impress my wife. "So, honey, how was your day?", "You wouldn't believe!!! Did you know that the ternary conditional operator can appear as a primary expr... Hey, don't fall asleep!!!"