forked from xbtlin/thinking-In-Java
-
Notifications
You must be signed in to change notification settings - Fork 2
Expand file tree
/
Copy pathRoShamBo1.java
More file actions
executable file
·78 lines (73 loc) · 2.17 KB
/
RoShamBo1.java
File metadata and controls
executable file
·78 lines (73 loc) · 2.17 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
//: enumerated/RoShamBo1.java
// Demonstration of multiple dispatching.
package enumerated;
import java.util.*;
import static enumerated.Outcome.*;
interface Item {
Outcome compete(Item it);
Outcome eval(Paper p);
Outcome eval(Scissors s);
Outcome eval(Rock r);
}
class Paper implements Item {
public Outcome compete(Item it) { return it.eval(this); }
public Outcome eval(Paper p) { return DRAW; }
public Outcome eval(Scissors s) { return WIN; }
public Outcome eval(Rock r) { return LOSE; }
public String toString() { return "Paper"; }
}
class Scissors implements Item {
public Outcome compete(Item it) { return it.eval(this); }
public Outcome eval(Paper p) { return LOSE; }
public Outcome eval(Scissors s) { return DRAW; }
public Outcome eval(Rock r) { return WIN; }
public String toString() { return "Scissors"; }
}
class Rock implements Item {
public Outcome compete(Item it) { return it.eval(this); }
public Outcome eval(Paper p) { return WIN; }
public Outcome eval(Scissors s) { return LOSE; }
public Outcome eval(Rock r) { return DRAW; }
public String toString() { return "Rock"; }
}
public class RoShamBo1 {
static final int SIZE = 20;
private static Random rand = new Random(47);
public static Item newItem() {
switch(rand.nextInt(3)) {
default:
case 0: return new Scissors();
case 1: return new Paper();
case 2: return new Rock();
}
}
public static void match(Item a, Item b) {
System.out.println(
a + " vs. " + b + ": " + a.compete(b));
}
public static void main(String[] args) {
for(int i = 0; i < SIZE; i++)
match(newItem(), newItem());
}
} /* Output:
Rock vs. Rock: DRAW
Paper vs. Rock: WIN
Paper vs. Rock: WIN
Paper vs. Rock: WIN
Scissors vs. Paper: WIN
Scissors vs. Scissors: DRAW
Scissors vs. Paper: WIN
Rock vs. Paper: LOSE
Paper vs. Paper: DRAW
Rock vs. Paper: LOSE
Paper vs. Scissors: LOSE
Paper vs. Scissors: LOSE
Rock vs. Scissors: WIN
Rock vs. Paper: LOSE
Paper vs. Rock: WIN
Scissors vs. Paper: WIN
Paper vs. Scissors: LOSE
Paper vs. Scissors: LOSE
Paper vs. Scissors: LOSE
Paper vs. Scissors: LOSE
*///:~