eBay interview questions

1. http://www.vogella.com/articles/JavaDatastructures/article.html - practice the array implementation of hashmap. It will clear your generics concepts and gives the basic way a hashentry is created first
2. http://docs.oracle.com/javase/6/docs/api/java/util/WeakHashMap.html
3. http://stackoverflow.com/questions/34510/what-is-a-race-condition
4. http://stackoverflow.com/questions/519520/difference-between-static-class-and-singleton-pattern - A singleton can implement an interface, hence, it can be a singleton implementation of an interface. However, an all static methods class cannot implement an interface
5. Hashtable and collision resolving techniques : How is it done in java ?
6. Heap implementation
7. LCA
8. Coins DP
9. Eggs problem
10. http://stackoverflow.com/questions/137783/expand-a-random-range-from-15-to-17
11. http://www.regular-expressions.info/examples.html - you need to know all kinds of validations - date, email, IP and all kinds of regexes for that.