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Lecture Comments (6)

0 answers

Post by Scott Yang on July 11, 2019

Number is spelled wrong in the basic if-else statement

1 answer

Last reply by: Maury Hillstrom
Wed Jan 1, 2014 5:38 PM

Post by Dionisis Mastavralis on December 31, 2013

Hi,

I haven't understand when you are using "public static void main(String[] args)" and when "public static void main(String args[])" ?

0 answers

Post by Phil Wyder on March 19, 2013

Hi
I have trouble running example 4 in netbeans. It always tells me that the main class is not found. If I try to run it in Terminal, I get the following error.

Main method not found in class triangle, please define the main method as:
public static void main(String[] args)

I blindly copied your text and tried to make it work. When I just add "public static void main(String[] args)" it also doesn't work. How can I make it work?
thanks,
Flipx

0 answers

Post by Phil Wyder on March 19, 2013

You may change the lecture slide "Boolean Logical Operators" and switch the y value back to 2. The very similar tables could be confusing who do not realize that the y value changed from 2 to 3. (Which isn't necessary anyway.) I think changing the example (x==2||y==2) to (x==3||y==3).

0 answers

Post by Gregory Gauthier on January 20, 2013

Aloha, I am trying like the devil to do a practice exercise from my book:
But I would really appreciate seeing the code so I can grasp my errors and stop spending hours going in circles:
Here it is:

Write a program that allows the user to convert a temperature given in degrees from either Celsius to Fahrenheit or Fahrenheit to Celsius. Use the following formulas:

Degrees_C = 5(Degrees_F- 32)/9
Degrees_F = (9(Degrees_C)/5) + 32)

Prompt the user to enter a temperature and either a C or c for Celsius or an F or f for Fahrenheit. Convert the temperature to Fahrenheit if Celsius is entered, or to Celsius if Fahrenheit is entered. Display the result in a readable format. If anything other that C,c,F, or f is entered, print an error message and stop.

If Logic

  • “If” statements allow a program to make a decision
  • “If” statements require “yes or no” type questions
  • “If” statements take a desired action based on the answer to that question
  • Java “if” statements follow “If...Else...” logic

If Logic

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.

  • Intro 0:00
  • The Mighty 'If' 0:08
    • If Logic and If Statements
  • Conditional Statements in Java 1:44
    • If
    • If…Else
    • If…Else If….Else
    • Switch
  • Pseudocode 3:41
    • Pseudocode
    • Examples
  • Compound Assignment Operators 6:17
    • Compound Assignment Operators and Examples
  • Boolean Logical Operators 9:02
    • && Operator
    • | | Operator
    • ! Operator
  • 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

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Maury Hillstrom

Maury Hillstrom

If Logic

Slide Duration:

Table of Contents

Section 1: Java
Introduction to Java

31m 13s

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

31m 57s

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

29m 34s

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

34m 20s

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

37m

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

33m 56s

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

34m 3s

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

28m 15s

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

36m 53s

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

22m 45s

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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