If a variable inside a class is marked private then it
cannot be accessed directly.

Access to this variable can only be provided by a public
accessor and mutator methods. Example:

class MyClass {
    private int dataValue;
    
    public int getDataValue {
        return dataValue;
    }

    public void setDataValue( int newValue ) {
        dataValue = newValue;
    }
}

the variable declared as private can be accessed with in the
same class only