Java Reference
In-Depth Information
19
// output List elements
20
System.out.printf(
"Unsorted array elements:%n%s%n"
, list);
21
22
// sort in order using a comparator
23
Collections.sort(list,
new
TimeComparator());
24
25
// output List elements
26
System.out.printf(
"Sorted list elements:%n%s%n"
, list);
27
}
28
}
// end class Sort3
Unsorted array elements:
[6:24:34 AM, 6:14:58 PM, 6:05:34 AM, 12:14:58 PM, 6:24:22 AM]
Sorted list elements:
[6:05:34 AM, 6:24:22 AM, 6:24:34 AM, 12:14:58 PM, 6:14:58 PM]
Fig. 16.9
|
Collections
method
sort
with a custom
Comparator
object. (Part 2 of 2.)
Method
shuffle
randomly orders a
List
's elements. Chapter 7 presented a card shuffling
and dealing simulation that shuffled a deck of cards with a loop. Figure 16.10 uses method
shuffle
to shuffle a deck of
Card
objects that might be used in a card-game simulator.
1
// Fig. 16.10: DeckOfCards.java
2
// Card shuffling and dealing with Collections method shuffle.
3
import
java.util.List;
4
import
java.util.Arrays;
5
import
java.util.Collections;
6
7
// class to represent a Card in a deck of cards
8
class
Card
9
{
10
public
static enum
Face {
Ace
,
Deuce
,
Three
,
Four
,
Five
,
Six
,
11
Seven
,
Eight
,
Nine
,
Ten
,
Jack
,
Queen
,
King
};
12
public static enum
Suit {
Clubs
,
Diamonds
,
Hearts
,
Spades
};
13
14
private final
Face face;
15
private final
Suit suit;
16
17
// constructor
18
public
Card(Face face, Suit suit)
19
{
20
this.
face = face;
21
this.
suit = suit;
22
}
23
24
// return face of the card
25
public
Face getFace()
26
{
Fig. 16.10
|
Card shuffling and dealing with
Collections
method
shuffle
. (Part 1 of 3.)
