Q1
What is a class?
AA blueprint for creating objects
BAn instance of an object
CA type of variable
DA type of loop
ICSEClass 10 (ICSE)Computer ApplicationsCh 6 · Topic 1
Classes, Objects and Constructors
Classes are blueprints for creating objects, and constructors initialise objects with specific values when they are created.
Core concept
A class defines properties (variables) and behaviours (methods) that its objects will have, acting as a blueprint or template.
How it works
An object is an instance of a class, created using the 'new' keyword, with its own specific values for the class's properties.
Why it matters
A constructor is a special method that runs automatically when an object is created, typically used to initialise the object's properties.
Key detail
Understanding classes, objects, and constructors is fundamental to object-oriented programming (OOP), a key programming paradigm in Java.
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Quick notes
• A class is a blueprint for objects.
• It defines properties and behaviours.
• An object is an instance of a class.
• Objects are created using the 'new' keyword.
• A constructor initialises an object's properties.
• It runs automatically when an object is created.
• Classes, objects, constructors are fundamental to OOP.
• OOP is a key Java programming paradigm.