Ap Power Point Chpt4

Chapter 4: Writing Classes Presentation slides for Java Software Solutions for AP* Computer Science by John Lewis, William Loftus, and Cara Cocking Java Software Solutions is published by Addison-Wesley Presentation slides are copyright 2002 by John Lewis, William Loftus, and Cara Cocking. All rights reserved. Instructors using the textbook may use and modify these slides for pedagogical purposes. *AP is a registered trademark of The College Entrance Examination Board which was not involved in the production of, and does not endorse, this product.

Writing Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Objects ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Classes ,[object Object],[object Object],[object Object],[object Object],[object Object]

Classes ,[object Object],[object Object],[object Object],[object Object]

Classes ,[object Object],Data declarations Method declarations int x, y; char ch;

The Coin Class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The Coin Class ,[object Object],[object Object],[object Object],[object Object],[object Object]

Data Scope ,[object Object],[object Object],[object Object],[object Object]

Instance Data ,[object Object],[object Object],[object Object],[object Object],[object Object]

Instance Data ,[object Object],face 0 coin1 int face; class Coin face 1 coin2

Encapsulation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Encapsulation ,[object Object],[object Object],[object Object],[object Object]

Encapsulation ,[object Object],[object Object],Client Methods Data

Visibility Modifiers ,[object Object],[object Object],[object Object],[object Object]

Visibility Modifiers public private Variables Methods Violate encapsulation Enforce encapsulation Provide services to clients Support other methods in the class

Driver Programs ,[object Object],[object Object],[object Object],[object Object],[object Object]

Method Declarations ,[object Object],[object Object],[object Object],[object Object]

Method Control Flow ,[object Object],myMethod(); myMethod compute

Method Control Flow ,[object Object],doIt helpMe helpMe(); obj.doIt(); main

Method Header ,[object Object],char calc (int num1, int num2, String message) method name return type parameter list The parameter list specifies the type and name of each parameter The name of a parameter in the method declaration is called a formal argument

Method Body ,[object Object],char calc (int num1, int num2, String message) { int sum = num1 + num2; char result = message.charAt (sum); return result; } The return expression must be consistent with the return type sum and result are local data They are created each time the method is called, and are destroyed when it finishes executing

The return Statement ,[object Object],[object Object],[object Object],[object Object],[object Object]

Parameters ,[object Object],ch = obj.calc (25, count, "Hello"); char calc (int num1, int num2, String message) { int sum = num1 + num2; char result = message.charAt (sum); return result; }

Local Data ,[object Object],[object Object],[object Object],[object Object],[object Object]

Constructors Revisited ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Overloading Methods ,[object Object],[object Object],[object Object],[object Object],[object Object]

Overloading Methods double tryMe (int x) { return x + .375; } Version 1 double tryMe (int x, double y) { return x*y; } Version 2 result = tryMe (25, 4.32) Invocation

Overloaded Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Overloading Methods ,[object Object],[object Object],[object Object],[object Object]

Method Decomposition ,[object Object],[object Object],[object Object],[object Object]

Pig Latin ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Object Relationships ,[object Object],[object Object],[object Object],Author Book writes

Object Relationships ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Aggregation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Applet Methods ,[object Object],[object Object],[object Object],[object Object],[object Object]

Graphical Objects ,[object Object],[object Object],[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Ap Power Point Chpt4

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