Computer-Science-A-level-Ocr
-
3-3-networks8 主题
-
3-2-databases7 主题
-
3-1-compression-encryption-and-hashing4 主题
-
2-5-object-oriented-languages7 主题
-
2-4-types-of-programming-language4 主题
-
2-3-software-development5 主题
-
2-2-applications-generation6 主题
-
2-1-systems-software8 主题
-
1-3-input-output-and-storage2 主题
-
1-2-types-of-processor3 主题
-
1-1-structure-and-function-of-the-processor1 主题
-
structuring-your-responses3 主题
-
the-exam-papers2 主题
-
8-2-algorithms-for-the-main-data-structures4 主题
-
8-1-algorithms10 主题
-
7-2-computational-methods11 主题
-
7-1-programming-techniques14 主题
-
capturing-selecting-managing-and-exchanging-data
-
entity-relationship-diagrams
-
data-normalisation
-
relational-databases
-
hashing
-
symmetric-vs-asymmetric-encryption
-
run-length-encoding-and-dictionary-coding
-
lossy-and-lossless-compression
-
polymorphism-oop
-
encapsulation-oop
-
inheritance-oop
-
attributes-oop
-
methods-oop
-
objects-oop
-
capturing-selecting-managing-and-exchanging-data
-
6-5-thinking-concurrently2 主题
-
6-4-thinking-logically2 主题
-
6-3-thinking-procedurally3 主题
-
6-2-thinking-ahead1 主题
-
6-1-thinking-abstractly3 主题
-
5-2-moral-and-ethical-issues9 主题
-
5-1-computing-related-legislation4 主题
-
4-3-boolean-algebra5 主题
-
4-2-data-structures10 主题
-
4-1-data-types9 主题
-
3-4-web-technologies16 主题
-
environmental-effects
-
automated-decision-making
-
computers-in-the-workforce
-
layout-colour-paradigms-and-character-sets
-
piracy-and-offensive-communications
-
analysing-personal-information
-
monitoring-behaviour
-
censorship-and-the-internet
-
artificial-intelligence
-
the-regulation-of-investigatory-powers-act-2000
-
the-copyright-design-and-patents-act-1988
-
the-computer-misuse-act-1990
-
the-data-protection-act-1998
-
adder-circuits
-
flip-flop-circuits
-
simplifying-boolean-algebra
-
environmental-effects
objects-oop
Objects (OOP)
What is an object?
-
An object is a representation of a real-world entity eg teacher, aeroplane, mobile phone, cat etc
-
A class is like a blueprint that describes the properties and behaviours of objects, while an object is a specific instance created based on that blueprint with its own unique values for the properties
-
A constructor is a special method within a class that is automatically called when an object of that class is created (instantiated)
-
Constructors typically define the initial values of instance variables and perform any necessary setup to prepare the object for use
Example of 2 objects belonging to a class
Worked Example
A supermarket uses an object-oriented approach to organise items that it offers for sale. Part of the class definition for the ItemForSale class is shown below:
class ItemForSale public itemName public price public discount
Write a line of code to create an object of type ItemForSale called mushypeas that has a name of “mushy peas” and a price of £0.89
[3]
How to answer this question:
-
Creating object with identifier
-
mushypeas =
-
-
creating object as type
-
ItemForSale
-
-
mark for parameters passed in as needed (“mushy peas”,0.89) [1 mark]
Answer:
Example answer 1 to get full marks:
mushypeas=new ItemForSale("mushy peas", 0.89)
Example answer 2 to get full marks:
ItemForSale mushypeas = ItemForSale(“mushy peas”,0.89);
Responses