What is the use of encapsulation when I'm able to change the property values with setter methods?

Question

I try to understand a lot of times but I failed to understand this.

Encapsulation is the technique of making the fields in a class private and provi

Answer 1

Lets suppose you make a custom Date class with the following setters / getters:

getDay() 
getMonth() 
getYear() 
setDay() 
setMonth() 
setYear()

Internally you could store the date using:

private int day;
private int month;
private int year;

Or you could store the date using a java.lang.Date-object:

private Date date;

Encapsulation doesn't expose how your class is working internally. It gives you more freedom to change how your class works. It gives you the option to control the access to your class. You can check if what the user enters is valid (you don't want the user to enter a day with a value of 32).