Java Reference
In-Depth Information
Figure 1—Array of Blocks
Try This Yourself
Now it's your turn. Make a small change to reverse the order of the tower's
elements, so that the anvil is on the bottom and the stone is on the top.
Change the
for
loop around to do this. Instead of going from 0 to < 5, change
the loop to go from 4 down to >= 0. Hint: Subtraction might work better than
addition in this case.
Rebuild, stop, start, and try the
/arrayofblocks
command again.
Now you know how to work with
for
loops and indexes, but to be honest, this
is an old corner of Java, and it's a tad musty.
Array
objects are handy, but
there's perhaps a better choice.
Use a Java ArrayList
An
ArrayList
in Java also keeps track of a list of values, just like a simple
Array
does.
ArrayList
s are a little messy to declare but simple enough to use, and
much more flexible and a bit safer than plain old
Array
objects. You can add
and delete from the
ArrayList
as many times as you want; it's not a fixed length
and will grow or shrink as needed.
Here's an example of an
ArrayList
that will hold
Player
objects:
List
<Player> myPlayerList =
new ArrayList
<Player>();
