-
Notifications
You must be signed in to change notification settings - Fork 17
Expand file tree
/
Copy pathObservableExample.java
More file actions
38 lines (32 loc) · 945 Bytes
/
Copy pathObservableExample.java
File metadata and controls
38 lines (32 loc) · 945 Bytes
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
package patterns.behavioral;
import java.util.ArrayList;
import java.util.List;
public class ObservableExample {
public static void main(String[] args) {
MyObserver concreteMyObserver = new MyObserver( "one");
MyObserver concreteMyObserver2 = new MyObserver("two");
concreteMyObserver.setState("state 1");
concreteMyObserver2.setState("state 2");
}
}
class MyObserver {
String name;
String state;
static List<MyObserver> myObservers = new ArrayList<>();
public MyObserver(String name) {
this.name = name;
myObservers.add(this);
}
void setState(String state) {
this.state = state;
notifyAllObservers();
}
public void notifyAllObservers() {
for(MyObserver myObserver : myObservers) {
myObserver.update();
}
}
public void update() {
System.out.println(name + " has new state " + state);
}
}