Class
A blueprint for creating objects, defining their data (attributes) and actions (methods).
In class:
In the Person class name, height, and weight are instance variables, while sleep(int hours) and walk(double distance) are methods.
class Person{ String name; double height; double weight;
void sleep(int hours){ ... } void walk(double distance){ ... } }Instance variable
A variable defined in a class for which each instantiated object of the class has its own copy.
If you create two Person objects Mike and Sara, each will have its own name, height, and weight.
class Vehicle { // define a class // here are the attributes String brand; int wheels;
public static void main(String[] args) { Vehicle car = new Vehicle(); // create first object car.brand = "Toyota"; // edit instance variables car.wheels = 4;
Vehicle truck = new Vehicle(); // create second object truck.brand = "Ford"; // edit instance variables truck.wheels = 8;
System.out.println(car.brand + " " + car.wheels); // output instance variables System.out.println(truck.brand + " " + truck.wheels); }}
Note
Identifier
A name used to identify a programming entity, such as a class, variable, or method.
Rules for identifiers:
Avoid using reserved keywords (e.g. class, int) as identifiers.
class Car{ ...}Primitive
A basic data type provided by a programming language.
These are not objects and are stored directly in memory.
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(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.
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