Java- Data Hiding/ Chapter -1 / OOP's Concept

Data Hiding:-

Outside person cannot access our internal data directly.
                                    or
Our internal data shouldn't go out directly this OOP's feature is called as "Data Hiding".

After validation or identification outside person can access our internal data.  

example 1: -After entering valid username and password we can able to access our Gmail account information.

example 2: -Even though we are the valid customer of the bank, we can able to access our account information and we can't access other's account information.

                  HOW ACHIEVE DATA HIDING


By declaring data member (variable) as private we can achieve data hiding. 

example:-

public class SBIAccount
{
            private double balance;
          /*some more code here*/
            public double getBalance( )
          {
                   // Validation
                    return balance;
          }
 }

The main advantage of data hiding is "Security".
It is highly recommended to declare data member (variable) as private.