-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathJava200_User.java
More file actions
42 lines (29 loc) · 893 Bytes
/
Copy pathJava200_User.java
File metadata and controls
42 lines (29 loc) · 893 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
39
40
41
42
package java0913_collection;
class Average<T extends Number> {
private T[] list;
public Average() {
}
public Average(T[] list) {
this.list = list;
}
public double findAverage() {
double sum = 0.0;
for (T data : list)
sum = sum + data.doubleValue();
return sum / list.length;
}
}
public class Java200_User {
public static void main(String[] args) {
Integer it[] = new Integer[] { 1, 5, 3, 2 };
Average<Integer> av = new Average<Integer>(it);
System.out.println(av.findAverage());
Double de[] = new Double[] { 4.2, 10.3, 2.8 };
Average<Double> ag = new Average<Double>(de);
System.out.println(ag.findAverage());
// Average<String> ae = null; // Number를 상속받는 제너릭 타입만 선언 가능하다.
Number nb[] = new Number[] { 2, 5.3f, 4.5 };
Average<Number> aa = new Average<Number>(nb);
System.out.println(aa.findAverage());
}
}