Classes, Objects, and Methods, Java

Classes, Objects, and Methods

I. Java: Lecture 3 | 29:34 min

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Text Comments (21)

	2 answers Last reply by: Mick Coyne Wed Oct 10, 2012 10:09 PM Post by Jethro Jones on February 27, 2011 I'd really like to have the sample code for these lessons so that I can follow along and tweak on my computer while I watch.
	0 answers Post by Matthew Lipman on October 19, 2011 Dear Hillstrom, seems u are smart by nature, easy to understand anything from you : ) i have a question, can you provide leasson for Java SWING!? Thanks :)
	0 answers Post by Tanaroek Thanaaphiwong on July 7, 2012 what happens if the number of each account becomes 0, even though they are written 500 or 100 on the page. does anyone know how to fix this problem
	0 answers Post by Jacob Mack on August 6, 2012 Maury, I notice you do not capitalize like so: public class AccountCredit. To have public class accountcredit from what I understand could cause a compile error, but I could be mistaken. Thank you for taking time out to clarify this. I really enjoy working watching and working on programming with your videos.
	0 answers Post by Jacob Mack on August 6, 2012 I apologize as I was able to get public class accounntcredit to compile. I guess most textbooks just use the capital letter naming convention.
	3 answers Last reply by: Annette Hoult Sat Oct 27, 2012 6:33 PM Post by Sergio Gutierrez on August 22, 2012 what is this Printf?? this drives me crazy!!
	1 answer Last reply by: Maury Hillstrom Wed Nov 7, 2012 6:38 PM Post by Keron John on November 7, 2012 I need to know where is the other class being called exactly in the code, I mean the precise lines in the code that are calling the other class, as I'm trying to do this and failing miserably.
	0 answers Post by mustafa aloqayli on December 23, 2012 Java is not hard but some people try to show you that you have to be very smart to get what is java ... i'm really sorry for the people who comes here and pay money to start with, privet, or high level code which is a big puzzle for people who came to start from zero ?? you just moved from " Hello World " to use private and calling method you starting with puzzle code I wish if I can speak English to teach you guys introduction to Java
	0 answers Post by Ovanes Mikaelian on January 4 at 08:57:58 PM After setting up the "public class accountcredit", which extension do we use to save the file - .class or .java? Thank you.
	0 answers Post by Jonathan Rugel on February 4 at 05:28:33 AM He's a bore
	0 answers Post by Jonathan Rugel on February 4 at 05:29:29 AM He's very vague with his lessons. :(
	0 answers Post by Naeif Rafeh on March 6 at 08:57:12 PM I have problem from the Calendar class I have no idea why Ecleps did now recognized the Clendar Class or did not import the Calendar class
	0 answers Post by Michael McDermott on March 12 at 02:34:53 PM This is not teaching. The instructor narrates code which includes concepts that have not been taught.
	0 answers Post by JOSEPH PELLAM on March 18 at 02:27:01 PM I copied your code for the Squaresandcubes code but the following code for 1 thru 0: System.out.printf("%d\t%d\t%d "), x, (x * x), (x * x * x )); x = 1; Generates the following error for each line as follows: C:\Users\jpellam.DEVELOPMENT\Documents\NetBeansProjects\squaresandcubes\src\squaresandcubes\Squaresandcubes.java:24: not a statement System.out.printf("%d\t%d\t%d "), x, (x * x), (x * x * x )); C:\Users\jpellam.DEVELOPMENT\Documents\NetBeansProjects\squaresandcubes\src\squaresandcubes\Squaresandcubes.java:24: ';' expected Not sure what I am missing. Thanks
	0 answers Post by Phil Wyder on March 18 at 05:01:59 PM can a float or a double be negative? For example: -21.23234

Classes, Objects, and Methods

Java uses Classes, Objects, and Methods in order to perform tasks
Classes contain the general information about the program, whereas Objects are specific instances of Classes.
Methods are sets of instructions that tell the classes and objects what to do
Java has a small set of Primitive Data Types which define basic data such as text and numbers
All data types can be used as declared variables
When an object is initialized for the first time, a Constructor is used to specify attributes

Classes, Objects, and Methods

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

I. Java
	Introduction to Java	31:13
	Working with Java	31:57
	Classes, Objects, and Methods	29:34
	If Logic	34:20
	Loops	37:00
	Modules	33:56
	Arrays	34:03
	Inheritance	28:15
	Polymorphism	36:53
	Exception Handling	22:45

AP Computer Science: Java


Introduction to Java			31:13
	Intro		0:00
	What is Java?		0:12
		Definition of Java	0:13
	Writing a Java Program		3:48
		Example: Converter IO Program	3:49
		Example: Grade Program	8:00
		Example: Writing a Java Program	12:13
	Starting Point of All Java Code		14:00
		'Public Static Void Main'	14:01
	'Public Static Void Main' Syntax		16:07
		Syntax	16:08
		String	16:27
		args	16:41
	How to Add Comments		17:13
		How to Add and Use Comments	17:14
	Java Statements		17:59
		Java Statements and Example	18:00
	Example1: Text-printing Program		18:44
	Example 2: Text-printing on Multiple Lines		20:12
	Example 3: Addition Program that Displays the Sum of Two Numbers		21:11
	Example 4: Program that Determines Calculations of Two Numbers		24:43
	Example 5: Running Programs Through NetBeans IDE		25:50
Working with Java			31:57
	Intro		0:00
	History of Java		0:09
		History of Java	0:10
	Requirements of Java		2:35
		Free to Download & Install	2:36
		System's Path Environment Variable	4:40
	Java's Two-Step Process		5:48
		Create Source File	5:49
		Compile Source File Into Bytecode	6:49
	Java Application Creation		7:35
		Two Main Ways to Create Java Application	7:36
		Other Popular Java-compatible IDE	8:08
	Importing Classes		8:45
		Importing Classes, Example, and Syntax	8:46
	Arithmetic Rules of Precedence		10:02
		PEMDAS vs. P(MDR)(AD)(Java)	10:03
	Four More Program Examples		13:22
		Example: Circle Geometry	14:06
		Example: Searching Through a Text String	19:50
		Example: Doing a Find & Replace	23:35
		Example: Calendar Functions	25:45
Classes, Objects, and Methods			29:34
	Intro		0:00
	Classes, Objects, and Methods		0:09
		Class	0:10
		Object	0:57
		Attributes	1:14
		Method	1:33
		Arguments	1:48
	Instance Variables		2:17
		Instance Variables	2:18
	Set and Get Methods		3:15
		Set and Get Methods	3:16
	Primitive Types vs. Reference Types		4:11
		Primitive Types	4:12
		Reference Type	6:56
	Constructors		7:22
		Attributes of Constructors	7:23
	Example 1: Prints a Table of Squares and Cubes From 0 to 10		8:26
	Example 2: Bank Account Class with Constructor		11:54
	Example 3: Create and Change Account Object		14:14
	Example 4: Bank Account Debit Function		18:44
	Example 5: Debit Account Balance Program		20:08
	Example 6: Hardware Store Inventory & Invoice		22:50
	Example 7: Hardware Store Inventory & Invoice Main Class		26:05
If Logic			34:20
	Intro		0:00
	The Mighty 'If'		0:08
		If Logic and If Statements	0:09
	Conditional Statements in Java		1:44
		If	1:45
		If…Else	2:07
		If…Else If….Else	2:33
		Switch	3:15
	Pseudocode		3:41
		Pseudocode	3:42
		Examples	4:05
	Compound Assignment Operators		6:17
		Compound Assignment Operators and Examples	6:18
	Boolean Logical Operators		9:02
		&& Operator	9:03
		\| \| Operator	9:58
		! Operator	11:38
	Example 1: Program that Determines the Larger of Two Numbers		13:00
	Example 2: Determine the Largest and Smallest Entry		15:55
	Example 3: Determine if a Number is Odd or Even		19:24
	Example 4: Determine if Three Values Could Form a Triangle		21:44
	Example 5: Run Application for Triangle		24:23
	Example 6: Basic If…Else Statement		25:11
	Example 7: Basic If…Else If…Else Statement		26:52
	Example 8: Catch Possibilities if User Enters Invalid Numbers		28:38
	Example 9: Basic Switch Statement		31:10
Loops			37:00
	Intro		0:00
	Types of Loops		0:07
		For Loop	0:54
		While Loop	1:15
		Do…While Loop	1:39
	Increment and Decrement Operators		2:26
		Operators Overview	3:11
		Pre-Increment	4:34
		Pre-Decrement	5:35
		Post-Increment	6:01
		Post-Decrement	6:25
	Counters vs. Sentinels		7:06
		Counters	7:07
		Sentinels	7:40
	Break & Continue Statements		8:46
		Break	8:47
		Continue	9:29
	While Loop Syntax		10:03
		While Loop Syntax and Example	10:04
	For Loop Syntax		11:54
		For Loop Syntax and Example	11:55
	Example 1: Calculate Commissions for Sales Staff		13:55
	Example 2: Program Calculates Average Miles Per Gallon		18:56
	Example 3: Find the Smallest of Entered Numbers		23:30
	Example 4: Return the Lyrics to 'The 12 Days of Christmas'		27:37
	Example 5: Do While Setup		31:50
	Example 6: Break Loop Statement Example		34:21
	Example 7: Continue Loop Statement Example		35:05
Modules			33:56
	Intro		0:00
	Types of Modules		0:09
		Methods & Classes	0:10
		Packages	0:28
	Static Class Members		1:20
		Static Class Members	1:21
		Example of Static Class Members	1:51
	Queues vs. Stacks		3:21
		Queues	3:51
		Stacks	5:06
		Push and Pop	5:42
	Method Overloading		6:05
		Method Overloading	6:06
	The 'this' Keyword		7:13
		'this' Keyword	7:14
		Example	7:28
	Composition vs. Inheritance		8:05
		Composition and Example	8:23
		Inheritance and Example	9:33
	Example 1: Roll a Six-diced Die 10,000 Times		10:53
	Example 2: Program Calculates Charges for Parking Lot		14:47
	Example 3: Test Application for Class Parking		20:30
	Example 4: Program that Converts Fahrenheit to Celsius and Vice Versa		23:43
	Example 5: Program Simulates Tossing a Coin		29:25
Arrays			34:03
	Intro		0:00
	What is an Array?		0:08
		Attributes of Array	0:09
	Types of Arrays		1:10
		Single-Dimensional	1:18
		Two-Dimensional	2:01
	How to Declare an Array		3:15
		Declaring an Array: Single Dimension	3:16
		Declaring an Array: Two Dimension	4:12
	The Enhanced 'for' Statement		5:02
		'for' Statement	5:03
	Passing Arrays to Methods		7:14
		Pass by Value	7:34
		Pass by Reference	7:54
	Example 1: Simple Array		8:24
	Example 2: Program Simulates Rolling Two Six-sided Dice 36,000 Times		9:54
	Example 3: Application Roll Two Dice		14:49
	Example 4: Program Totals Sales for Sales Staff and Products		17:24
	Example 5: Application for Class Sales		21:08
	Example 6: Card Class Represents a Playing Card		24:43
	Example 7: Deck Class Represents a Deck of Playing Cards		26:36
	Example 8: Card Shuffling and Dealing Application		30:35
Inheritance			28:15
	Intro		0:00
	Composition vs. Inheritance		0:07
		Composition & Example	0:17
		Inheritance & Example	1:16
	Composition vs. Inheritance		2:04
		Visual Diagram	2:05
	Inheritance Class Structure		4:36
		Parent Class	4:37
		Child Class	4:51
		Purpose of Inheritance	5:01
	Method Overriding vs. Overloading		6:32
		Method Overriding	6:39
		Method Overloading	7:28
	Inheritance Class Hierarchy		8:01
		Inheritance Class Hierarchy	8:02
	Protected Members		10:27
		Public, Protected, and Private	10:28
	Example 1: Basic Inheritance with Constructors		12:11
	Example 2: Program Exhibits Both Composition and Inheritance		16:03
	Example 3: Class Point Definition		21:07
	Example 4: Class Quadrilateral Definition		22:15
	Example 5: Class Trapezoid Definition		23:09
	Example 6: Class Parallelogram Definition		24:05
	Example 7: Class Rectangle Definition		24:37
	Example 8: Class Square Definition		24:50
	Example 9: Main Application for Shapes Exercise		25:42
Polymorphism			36:53
	Intro		0:00
	What is Polymorphism?		0:08
		Definition of Polymorphism	0:09
	Polymorphism in Programming		1:10
		Superclass	1:11
		Subclass	2:11
		Variable	2:21
		Method	2:31
	Polymorphism in Programming		3:46
		Superclass	3:47
		Subclass	4:16
		Variable	4:22
		Method	4:31
	Abstract Classes vs. Concrete Classes		6:31
		Abstract Classes	6:32
	Abstract Class Polymorphism Example		9:19
		Abstract Superclass	9:20
		Concrete Subclasses	9:58
	'Final' Keyword for Superclass Methods		13:49
		'Final' Keyword	13:50
		Example	14:21
	Example 1: Program to Demonstrate Basic Polymorphism		16:25
	Example 2: Program to Demonstrate Polymorphism with Multiple Subclasses		18:35
	Example 3: Program Tests Shape Hierarchy		25:12
	Example 4: Definition of Class Shape		27:17
	Example 5: Definition of Class Two Dimensional Shape		28:31
	Example 6: Definition of Class Three Dimensional Shape		29:29
	Example 7: Definition of Class Sphere		33:45
Exception Handling			22:45
	Intro		0:00
	What is Exception Handling?		0:09
		Definition of Exception Handling	0:10
	Why Account for Errors?		1:31
		Why Account for Errors?	1:32
	Common Types of Errors		3:51
		User Caused	3:52
		Programmer or System Caused	5:31
	Using the 'Try… Catch' Process		7:30
		Try	7:35
		Catch	8:27
	Try… Catch Syntax		8:51
		Try… Catch Syntax	8:52
	Uncaught Exceptions		9:44
		Handling Uncaught Exceptions	9:45
	Throw' Statement		11:03
		Throw Statement	11:04
		Throw Syntax	11:22
	Example 1: Program to Catch Divide by Zero Error		11:41
	Example 2: Program to Demonstrate Finally Keyword		16:18
	Example 3: Superclass and Subclass Exceptions		19:20

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Classes, Objects, and Methods

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Classes, Objects, and Methods

Classes, Objects, and Methods

AP Computer Science: Java

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