Answer:
- Is this code correct?
- Yes.
- What did it do?
- It exchanged the objects in the first two slots of the array.
Object classThis sort of activity is very 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,
there is a pre-defined class that is the ultimate ancestor of all other classes.
This class is called Object.
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?JApplet an Object?