In the Person class, methods like sleep, wakeUp, walk, and run define what a Person object can do.
class Person{ void sleep(){ ... } void wakeUp(){ } void walk(){ ... } void run(){ }}To utilise the benefits of OOP, we must clearly define the scope of class variables and methods, that is, specify from where they are directly accessible.
Hence, we need access modifiers.
Access modifiers
Keywords that define the visibility and accessibility of class members (variables and methods).
Access modifiers are essential for implementing encapsulation, a core principle of OOP that promotes data hiding and modular design.
We have three primary access modifiers:
Here, in the ReadingMaterial class, instance variables like id, title, pages, and price are private.
class ReadingMaterial{ private int id; private String title; private int pages; private double price;
public static void main(String[] args){ // to test ReadingMaterial book = new ReadingMaterial(); // get book object book.title = "Fahrenheit 451"; // error as you cannot access it from here }}The access modifier keyword is written before the data type in the declaration of the variable or method signature.
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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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