SE450: Horstmann Chapter 1: Object References

Object variable holds a reference

Greeter worldGreeter = new Greeter("World");

Can have multiple references to the same object
```
Greeter anotherGreeter = worldGreeter;
```
After applying mutator method, all references access modified object
```
anotherGreeter.setName("Dave");
// now worldGreeter.sayHello() returns "Hello, Dave!"
```