Following are the points that are highlighted in Kathi Sierra and Bert Bates book on SCJP6.
1- Console class.
2- NavigableSet and NavigableMap.
3- Lower(int) and higher(int) function are added in Treeset collection.
4- Polling method in TreeSet and TreeMap.
5- TreeSet.descendingSet() and TreeMap.descendingMap().
Thanks to Bilal for discussing these points with me.