PPT-Access to Instance Variables and Overriding Methods

Java Unit 11 Inheritance I Both instance variables and methods are inherited In a program that uses an instance of a subclass it is possible to work with the objects instance variables by using the corresponding get and set methods which are also inherited from the superclass . Introduction to Classes and Objects. Review. When a argument is . passed by value. , what does the corresponding parameter hold?. The . value. of the argument.. When a argument is . passed by . reference. Methods. There are three major components of a class definition.. 1. Instance . variables . (also called . fields in the API documentation).. 2. Constructors. .. 3. Methods. .. The following notes will show how to write code for a user designed class, dealing with each of those three parts in order. . Bryce . Boe. 2012/08/28. CS32, Summer 2012 B . Overview. Assignment Operator. Inheritance. Descendants and Ancestors. Instance variables and methods. Protected. Constructors. Calling ancestor functions. and other languages… . Reflection. Also called . introspection. Program can examine/modify its own state. set variables. call methods. add new methods. define new . objects. Who Am I? (said the object). 7. . Smalltalk 80. Smalltalk. From the Wikipedia:. Smalltalk is an object-oriented, dynamically typed, reflective programming language. Smalltalk was created as the language to underpin the "new world" of computing exemplified by "human–computer symbiosis.”. You overhear a boy & his mother talking:. Mom: What is 25 + 8?. Boy: That's easy, 33.. Mom: Good. What's 33 + 7?. Boy: Simple. It's 40.. Mom: Excellent! Now what's 40 + 23?. Boy: Boring. The answer is 37.. 1. John Korah. Contains content provided by . George . Koutsogiannakis. . & Matt Bauer. Today’s Learning Objectives. What is a class?. How to create a class?. How to use a class?. Specific Objectives. Introduction to Classes, Objects Methods and Strings. Android How to Program, 3/e. © Copyright 1992-2016 by Pearson Education, Inc. All Rights Reserved.. © Copyright 1992-2016 by Pearson Education, Inc. All Rights Reserved.. 1. Overriding Methods. A child class can . override. the definition of an inherited method in favor of its own. The new method must have the same signature as the parent's method, but can have a different body. (Review). What . is . an Object?. Objects have states and behaviors. Example: A dog has states - color, name, breed as well as behaviors -wagging, barking, eating. An object is an instance of a class. Information Hiding and Encapsulation. Yi Hong. June 03, 2015. Review of Pass-By-Value. What is the output?. public void swap(Student s1, Student s2) {. . Student s3 = s1;. s1 = s2;. . s2 = s3;. }. and other languages… . Reflection. Also called . introspection. Program can examine/modify its own state. set variables. call methods. add new methods. define new objects. Who Am I? (said the object). Lecture Slides #3: Introduction to OOD S1 . 2015. Version 1.1 of 2015-03-12: added . return. to code on slides 10, 13. Agenda. COMPSCI 230: IOOD. 2. Topics:. Software Design (vs. hacking). Object-Oriented Design. Unit-2 Objects and Classes. Introduction. Languages like Pascal, C, FORTRAN, and COBOL are called procedure oriented programming languages. Since in these languages, a programmer uses procedures or functions to perform a task. .