Getting Clojure

A Peek at Java …

Java is all about objects. A Java object is little bundle of data and code that typically represents a thing, possibly something in the real world like a book but possibly something more abstract like a stack or a queue. The data in objects is organized as fields, named values attached to the object. So an object that represents a book might have fields called title and author.

Every Java object is associated with a class. It’s an object’s class that determines exactly which fields and which methods the object carries. Classes typically also specify a constructor, a special bit of code that gets called when a new object is created. It’s the constructor that initializes the fields on an object and otherwise gets it ready to ...