"Hi, Amigo!"

Interview questions
1 How do I use the Comparable interface?
2 How do I use the Comparator interface?
3 What methods does the Collections class have?
4 What methods does the Arrays class have?
5 What do we call the sorting that happens when Collections.sort() is called?
6 What is the concurrent package?
7 What classes from the concurrent package do you know?
8 How is the ConcurrentHashMap class organized?
9 How is the ConcurrentHashMap class organized?
10 What is an iterator?
11 What's a mutex?
12 What's a monitor?