Point out difference between sleep() and wait() method in java

Where to use fork/join as opposed to using the ExecutorService framework?

Why do threads block on I/O?

Describe synchronization in respect to multithreading

What is Difference between wait() and sleep()

What does join() method?

What is the difference between preemptive scheduling and time slicing?

What is thread?

What is multithreading?

Does iOS support multitasking?

What is synchronization in respect to multi-threading in Java?