UNIVERSITY AT BUFFALO, THE STATE UNIVERSITY OF NEW YORK
The Department of Computer Science & Engineering

STUART C. SHAPIRO: CSE 115 C

CSE 115
Introduction To Computer Science for Majors I
Lecture C
Lecture Notes #15
Stuart C. Shapiro
Spring, 2007

Interfaces

Interface header:
public interface IName
Interface body contains list of method headers.
A class may implement any number of interfaces:
public class Name implements IName1, IName2, ...
A class that implements an interface must define every method declared in the interface.
The name of an interface is a type that may be used to type a variable or a formal parameter, or give the return type of a method.
The name of a class that implements an interface is a subtype of the interface type.
An object of type ActualType may be assigned to a variable of type DeclaredType as long as ActualType is a subtype of DeclaredType

Last modified: Fri Oct 19 10:47:56 EDT 2007
Stuart C. Shapiro <shapiro@cse.buffalo.edu>

Interfaces