Summary

Chapter summary

Let’s summarize this chapter:

• Classes and structs share common features but have big differences.

• Classes are reference types. The new keyword constructs an anonymous class object and returns a class variable.

• Class variables that are not associated with any object are null. Checking against null must be done by is or !is, not by == or !=.

• The act of copying associates an additional variable with an object. In order to copy class objects, the type must have a special function likely named dup().

• Assignment associates a variable with an object. This behavior cannot be changed.