01
02
03
04
05
06
07
08
09
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
|
package observer.two;
public class Main {
public static void main(String[] argv) {
Int c = new Int();
Runnable r1 = new M(c);
Runnable r2 = new N(c);
for (int i=0; i<10000; i++) {
r1.run();
r2.run();
}
}
}
class Int {
private int v;
public int get() { return v; }
public void inc() { v++; }
public void dec() { v--; }
}
class M implements Runnable {
private int numOps;
private Int c;
public M(Int c) { this.c = c; }
public void run() {
c.inc(); System.out.println (++numOps);
c.inc(); System.out.println (++numOps);
c.dec(); System.out.println (++numOps);
}
}
class N implements Runnable {
private Int c;
public N(Int c) { this.c = c; }
public void run() {
for (int i=0; i<50; i++) {
if (i%3==0) {
c.dec(); /*??*/
} else {
c.inc(); /*??*/
}
}
}
}
|
