SE450: Horstmann Chapter 3: The Importance of Encapsulation

SE450: The Importance of Encapsulation [17/57]

Even a simple class can benefit from different implementations
Users are unaware of implementation
Public instance variables would have blocked improvement
- Can't just use text editor to replace all
```
d.year
```
  with
```
d.getYear()
```
- How about
```
d.year++?
```
- ```
d = new Day(d.getDay(), d.getMonth(), d.getYear() + 1)
```
- Ugh--that gets really inefficient in Julian representation
Don't use public fields, even for "simple" classes