Object classSwaping references is common in programming. You will see it a lot in the future. Notice that no new objects were created. Different reference variables were used for already-existing objects.
In Java,
the class Object is the ultimate ancestor of all other classes.
It is the root of the class hierarchy.
When you define a class like this:
class MyNewClass
{
}
you are actually defining a child of the Object class.
The following is the exact equivalent of the above:
class MyNewClass extends Object
{
}
Every class in Java — your own and every class in every library — descends
from Object.
This will be important to remember when you get to graphical user interfaces.
String an Object?Card an Object?Double an Object?