Describe difference between processes and threads ? Explain different ways of creating a thread. Which one would you prefer and why ? Explain the available thread states in a high-level

.Describe the difference between a synchronized method and a synchronized block ?

The questions here are all complete.

How does thread synchronization occurs inside a monitor ? What levels of synchronization can you apply ?

What's a deadlock ?

How do you ensure that N threads can access N resources without deadlock ?

What are the basic interfaces of Java Collections Framework ?

Why Collection doesn't extend Cloneable and Serializable interfaces ? What is an Iterator ? What differences exist between Iterator and ListIterator ? What is difference between fail-fast and fail-safe ? How HashMap works in Java ? What is the importance of hashCode() and equals() methods ? What differences exist between HashMap and Hashtable ? What is difference between Array and ArrayList ? When will you use Array over ArrayList ? Describe difference between ArrayList and LinkedList ? What is Comparable and Comparator interface ? List their differences. Describe the Java Priority Queue ? What do you know about the big-O notation and can you give some examples with respect to different data structures ? What is the tradeoff between using an unordered array versus an ordered array ?

What are some of the best practices relating to the Java Collection framework ?

What's the difference between Enumeration and Iterator interfaces ?

What is the difference between HashSet and TreeSet ?