Java Reference
In-Depth Information
ch09/measure2/DataSet.java
1 /**
2
Computes the average of a set of data values.
3 */
4
public class
DataSet
5 {
6 /**
7
Constructs an empty data set with a given measurer.
8 @param aMeasurer
the measurer that is used to measure
data values
9 */
10
public
DataSet(Measurer aMeasurer)
11 {
12 sum =
0
;
13 count =
0
;
14 maximum =
null
;
15 measurer = aMeasurer;
16 }
17
18 /**
19
Adds a data value to the data set.
20 @param x
a data value
21 */
22
public void
add(Object x)
23 {
24 sum = sum + measurer.measure(x);
25
if
(count ==
0
26 | | measurer.measure(maximum) <
measurer.measure(x))
27 maximum = x;
28 count++;
29 }
30
31 /**
32
Gets the average of the added data.
33 @return
the average or 0 if no data has been added
34 */
35
public double
getAverage()
36 {
37
if
(count ==
0
)
return
0
;
38
else return
sum / count;
400
401
