Basic HTML version of Foils prepared May 12 1996

Foil 73 The Overarching Object Class

From CRPC Lectures on Java Language Applets Graphics CRPC Annual Meeting Tutorial -- May 14,1996. by Geoffrey C. Fox


1 public class Object is the root of the Class hierarchy. Every java class has Object as its ultimate parent and so any object (object with a small o is any instance of any class) can use methods of Object
2 Methods of Object (used as object.Method()) include:
3 clone() Creates a clone of the object
4 equals(another object) compares two objects returning boolean answer
5 getClass() returns a descriptor of type Class (a child of Object) defining class of object
6 toString() returns a String which represents "value" of object. It is expected that each subclass will override this method
7 wait() in various forms is used to cause threads to wait
8 finalize() contains code to perform when object is deleted by system (I.e. garbage collected)

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