What is a constructor? Why are some items within a class designated as private? What are some properties that would be found in a programming language for concurrent processing that would not be found...

What is a constructor? Why are some items within a class designated as private? What are some properties that would be found in a programming language for concurrent processing that would not be found in a more traditional language? Describe two methods for ensuring mutually exclusive access to data. Identify some settings other than animation in which parallel computing is beneficial.