Selections EECS2030: Advanced Object Oriented Programming Fall 2018 CHEN-WEI WANG Learning Outcomes ● The Boolean Data Type ● if Statement ● Compound vs. Primitive Statement ● Common Errors and Pitfalls ● Logical Operations 2 of 56 Motivating Examples (1.1) 1 2 3 4 5 6 7 8 9 10 11 12 import java.util.Scanner; public class […]
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Program Correctness OOSC2 Chapter 11 EECS3311 M: Software Design Winter 2019 CHEN-WEI WANG Motivating Examples (1) Is this feature correct? class FOO i: INTEGER increment_by_9 require do i := i + 9 ensure i > 13 end end i>3 Q: Is i > 3 is too weak or too strong? A: Too weak ∵ assertion
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Selections EECS1022: Programming for Mobile Computing Winter 2018 CHEN-WEI WANG Motivating Examples (1.1) 1 2 3 4 5 6 7 8 9 10 11 12 import java.util.Scanner; public class ComputeArea { public static void main(String[] args) { Scanner input = new Scanner(System.in); final double PI = 3.14; System.out.println(“Enter the radius of a circle:”); double radiusFromUser
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Classes and Objects EECS2030 B: Advanced Object Oriented Programming Fall 2018 CHEN-WEI WANG Object Orientation: Observe, Model, and Execute ○ Study this tutorial video that walks you through the idea of . Real World: Entities Entities: jim, jonathan, … Entities: p1(2, 3), p2(-1, -2), … Compile-Time: Classes (definitions of templates) Run-Time: Objects (instantiations of templates)
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Generics EECS3311 A & E: Software Design Fall 2020 CHEN-WEI WANG Learning Objectives Upon completing this lecture, you are expected to understand: 1. A general collection ARRAY[ANY]: storage vs. retrieval 2. A generic collection ARRAY[G]: storage vs. retrieval 3. Generics vs. Inheritance 2 of 18 Motivating Example: A Book of Any Objects class BOOK names:
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Loops EECS1022: Programming for Mobile Computing Winter 2018 CHEN-WEI WANG Motivation of Loops ● We may want to repeat the similar action(s) for a (bounded) number of times. e.g., Print the “Hello World” message for 100 times e.g., To find out the maximum value in a list of numbers ● We may want to repeat
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Test-Driven Development (TDD) with JUnit EECS2030 B: Advanced Object Oriented Programming Fall 2018 CHEN-WEI WANG Motivating Example: Two Types of Errors (2) Approach 1 – Specify: Indicate in the method signature that a specific exception might be thrown. Example 1: Method that throws the exception Example 2: Method that calls another which throws the exception
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Void Safety EECS3311 A: Software Design Fall 2018 CHEN-WEI WANG 1 2 3 4 5 6 7 1 2 3 4 5 6 7 Java Program: Example 2 1 2 3 4 5 6 7 8 class Point { double x; double y; Point(double x, double y) { this.x = x; this.y = y; }
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Recursion EECS2030 B: Advanced Object Oriented Programming Fall 2018 CHEN-WEI WANG Beyond this lecture . . . ● Fantastic resources for sharpening your recursive skills for the exam: http://codingbat.com/java/Recursion-1 http://codingbat.com/java/Recursion-2 ● The best approach to learning about recursion is via a functional programming language: Haskell Tutorial: https://www.haskell.org/tutorial/ 2 of 50 Recursion: Principle ● is useful
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Void Safety EECS3311: Software Design Fall 2017 CHEN-WEI WANG 1 2 3 4 5 6 7 1 2 3 4 5 6 7 Java Program: Example 2 1 2 3 4 5 6 7 8 class Point { double x; double y; Point(double x, double y) { this.x = x; this.y = y; } @Test
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