implemented helper calculators

src/helper/DistanceCalculator.java

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+package helper;
+
+public interface DistanceCalculator {
+ void add(double a, double b);
+ double calculate();
+}

src/helper/MeanCalculator.java

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+package helper;
+
+public interface MeanCalculator {
+ void add(double a);
+ double calculate();
+}

src/helper/impl/EuklidesDistanceCalculator.java

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+package helper.impl;
+
+import helper.DistanceCalculator;
+
+public class EuklidesDistanceCalculator implements DistanceCalculator {
+
+ double sumBeforeSquare = 0;
+
+ @Override
+ public void add(double a, double b) {
+ sumBeforeSquare += Math.pow(a-b, 2);
+ }
+
+ @Override
+ public double calculate() {
+ double euklidesDistance = Math.sqrt(sumBeforeSquare);
+
+ sumBeforeSquare = 0;
+
+ return euklidesDistance;
+ }
+
+}

src/helper/impl/MeanCalaculatorImpl.java

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+package helper.impl;
+
+import helper.MeanCalculator;
+
+public class MeanCalaculatorImpl implements MeanCalculator {
+
+ double currentSum = 0;
+ int numberOfItems = 0;
+
+ @Override
+ public void add(double a) {
+ currentSum += a;
+ numberOfItems++;
+ }
+
+ @Override
+ public double calculate() {
+ double calculatedMean = currentSum/numberOfItems;
+
+ currentSum = 0;
+ numberOfItems = 0;
+
+ return calculatedMean;
+ }
+
+}