Constructed Types: Classes

• Declaration of a Java class shares many common aspects with classes in C++
• Java only supports single inheritance
• Effect of multiple inheritance may be achieved through the use of the interface construct
• A class may be declared to be abstract
  • No method implementations provided
  • All derived classes must provide implementations for all methods defined in the abstract class
• Java classes may declare both variables and methods
  • Variable defined inside of a class is an instance variable - one copy per object
  • Class methods invoked by applying them to an instance of a class object