-
Notifications
You must be signed in to change notification settings - Fork 1
/
DecoratorCodingExercise.java
60 lines (51 loc) · 1.15 KB
/
DecoratorCodingExercise.java
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
/*
Exercise for decorator section
Complete the Dragon class, which is BOTH a Lizard and a Bird
*/
package structural.decorator;
class Bird
{
public int age;
public String fly()
{
return age < 10 ? "flying" : "too old";
}
}
class Lizard
{
public int age;
public String crawl()
{
return (age > 1) ? "crawling" : "too young";
}
}
class Dragon {
private int age;
// Solution: instead of inheriting or creating a common interface, you instantiate two classes in the Dragon class
private Bird bird = new Bird();
private Lizard lizard = new Lizard();
// Need empty constructor
public Dragon() {}
public void setAge(int age)
{
// Set age of all animals to be the same
this.age = bird.age = lizard.age = age;
}
public String fly()
{
return bird.fly();
}
public String crawl()
{
return lizard.crawl();
}
}
class DecoratorExerciseDemo
{
public static void main(String[] args) {
Dragon dragon = new Dragon();
dragon.setAge(0);
System.out.println(dragon.crawl());
System.out.println(dragon.fly());
}
}