Constructor and setters

The benefit of using constructors is you can initialize the object when creating the object for ex

ClassA obj = new ClassA("hello"); // creating and initializing the object using the constructor which takes one string agrument

So why use setters you may ask ?

ClassA obj = new ClassA(); // created an object using default constructor

i want to set text "hello" to the object , how do i do that ?

obj.set("Hello") // if the class ClassA has a setter method which accepts string args i can do that

the other reason why we need setter is to prevent other objects accessing fields directly instead we expose them via getter and setter methods for ex

ClassA {

private int score;

public int getScore(){ return score; }

public void setScore(int arg){ score = arg; }

because we marked score field to be a private other objects outside this class can't access this variable the only way to access this variable is through set/get methods.