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DataAnalyzer.java
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DataAnalyzer.java
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/*
* Free for educational purposes
*/
package dataanalyzer;
import java.util.ArrayList;
import java.util.List;
import dataanalyzer.DataAnalyzer;
import java.util.Iterator;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Maintains a collection of floating-point numbers to compute
* their average, minimum, and maximum.
* @author janetlndavis
*/
public class DataAnalyzer {
private List<Double> collection;
/**
* Create a new DataAnalyzer
*/
public DataAnalyzer() {
collection = new ArrayList<Double>();
}
/**
* Adds a number to the collection
* @param number the number to add
*/
public void add(double number) {
collection.add(number);
}
/**
* Averages the numbers in the collection
* @return the average
* @throws NoDataException if there is no data to average
*/
public double average() throws NoDataException {
if (collection.isEmpty()) {
throw new NoDataException();
}
double sum = 0;
/* Do not use this loop style with collections -
depending on the collection implementation,
it might take O(n^2) running time due to get() method
for (int i=0; i < collection.size(); i++) {
sum += collection.get(i);
}
for (Iterator<Double> iter = collection.iterator();
iter.hasNext(); ) {
// Note iter.next() gets item and advances iterator
sum += iter.next();
}
The final loop is shorthand for the above.
*/
for (double val : collection) {
sum += val;
}
return sum / collection.size();
}
/**
* Test program for the DataAnalyzer
* @param args ignored
*/
public static void main(String[] args) {
DataAnalyzer analyzer = new DataAnalyzer();
analyzer.add(12.0);
analyzer.add(0.0);
analyzer.add(16.0);
analyzer.add(20.2);
try {
System.out.println("Average: " + analyzer.average());
// System.out.println("Minimum: " + analyzer.min());
// System.out.println("Maximum: " + analyzer.max());
} catch (NoDataException ex) {
Logger.getLogger(DataAnalyzer.class.getName()).log(Level.SEVERE, null, ex);
}
}
}