Object Oriented Programmingjackie/teaching/tutorials... · 2021. 1. 29. · Working over Remote...

EECS1022 Programming for Mobile Computing (Winter 2021)
Java Tutorials - Week 1
Work Environment + Software Management
* Create an EECS account: https://webapp.eecs.yorku.ca/activ8 * Remote labs: https://remotelab.eecs.yorku.ca/ * Eclipse available * Github commands available via a terminal * Clone a copy of repository here
+ Your Own Machine * Download the latest Eclipse: https://www.eclipse.org/downloads/ * Github desktop: https://desktop.github.com/ * Clone a copy of repository here

Gish add Commiteclipse
Local push RemoteLabCeithudebskwp .
Working over Remote Labs - Do not invoke the eclipse via the GUI icon! (which invokes Version 4.12) - On a terminal, type eclipse4.16 & - Do not type eclipse (which also invokes Version 4.12) - Before you log out and all data get lost, always commit and push your work back to Github!!
If You Want Extra Practice:
https://www.eecs.yorku.ca/~jackie/teaching/tutorials/index.html#java_from_scratch
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compute and ( manual ) (automated) .
Print values -6 console . compare return values against the expected values
console_apps
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junit_tests
use
use
- Classes & Methods - Methods * containing no print statements * return statements
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Arithmetic Sequence
- First Term (FT) - Common Difference (d) - Number of Terms - Sum
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5th : FT t→d 15+20=350 .
→ t# of terms - I
use
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Single If-Stmt with Overlapping Conditions
50 55 60 65 70 75 80 90
Correct Test Value: marks = 63

50 55 60 65 70 75 80 90
incorrect Test Value: marks = 63
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Test Inputs: weight = 10 marks = 44 Y weight = 15 marks = 54 Y weight = 20 marks = 64 No
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Tracing: Calculation of Indefinite Number of Assignments
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Indexing of an Array: Initializer
int[] ns = {10, 20, 30}; ns[0] = 23; ns[1] = 46; ns[2] = 69;
Address Calculation - base address - offset unit
Computer Memory
arrant integers
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Indexing of an Array: New Object
Address Calculation - base address - offset unit
Computer Memoryint[] ns = new int[3]; ns[0] = 23; ns[1] = 46; ns[2] = 69;
ns == risto] ×
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Computer MemoryVisualization: Creating Objects Template Definition
Instance Creation
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Mobile App Development in Android Studio Model, View, Controller
GUI Components - Text -> TextView - Text -> Plain Text - Containers -> Spinner - Buttons -> Button
App: Greeting App: Counter
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View vs. Controller: Event-Driven Programming
ControllerView
- Define Control Methods - Retrieve Inputs from GUI - Display Outputs on GUI
- Layouts GUI Components - Declare id’s of GUI Components - Attach/Register Control Methods
Each user interaction with a GUI component generates an event whose occurrence executes the attached/registered control method
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Controller
View
- Define Control Methods - Retrieve Inputs from GUI - Call Methods on model Objects - Display Outputs on GUI
- Layout GUI Components - Declare id’s of GUI Components - Attach Control Methods
Model-View-Controller: Separation of Concerns
retrieve inputs from GOI
Calculating Distances between Cities
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2yd dimension list CITED ( intersection of 2ndrows
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Creating a new 2D Array Object
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0
1
2
3
4
5
6
BOSTON
NEW_YORK
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MIAMI
DALLAS
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distance CITED
Two-Dimensional Arrays Part I: Utility Methods
Problem: Given an input 2D array of integers, return a string displaying its values: row by row vs. col by col (assuming a rectangle).
a
a
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Problem: Given an input 2D array of integers, return its overall average vs. row averages.
a
a
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Problem: Given an input 2D array of integers, return an array of size 2 storing its maximum and minimum values.
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Problem: Given an input 2D array of integers, return the row with the maximum sum.
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return a[nowIndex]
Problem: Given an input 2D array of integers, determine if elements are all positive.
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Problem: Given an input 2D array of integers, determine if it is a rectangle (i.e., each row has the same number of columns).
a
a
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Problem: Given an input 2D array of integers, determine if it is a square (i.e., each row has the same number of columns, and that number is equal to the number of rows of the 2-D array).
a
a
RECTANGLE
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F a
Problem: Given an input 2D array of integers, return a string array of size 2 displaying the lower-left and upper-left triangular areas of elements. Assumption: The input 2D array is of a square shape.
a
a
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Java API - Developing a Birthday Book using ArrayList vs. Hashtable
domain range
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BirthdayBookV2 - Tracing Hashtable Methods

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Object Oriented Programmingjackie/teaching/tutorials... · 2021. 1. 29. · Working over Remote...

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