CSCE 3193 Lecture Notes - Lecture 3: Instance Variable, Decimal Mark, Default Constructor

• School: University of Arkansas
• Department: Computer Science/Computer Engineering
• Course: CSCE 3193
• Professor: Patitz

Document Summary

Classes system and string are in package java. lang. Classes that are compiled in same directory on disk are in the same package-default package import declaration not required if always refer to class via its fully qualified class name. Example: import java. util. arraylist(tells compiler where to find stuff) Class normally consists of one or more methods that manipulate attributes the belong to object. Attributes-fields-declared inside class, outside bodies of class"s methods. Instance variable each object maintains its own copy of an attribute. Example:public class gradebook{ private string coursename; //maintains its own copy of instance variable coursename public void setcoursename( string name) //allows client code to change coursename. Return coursename;} //allows client code to obtain coursename. //allows you to protect your class and stay classy san diego. Public void displaymessage(){ //no parameter because all methods in class already know. Every instance(object) of a class contains one copy of each instance variable.