Fix javadoc for module "statistics" (#396)

Author: dr0i

metafacture-statistics/src/main/java/org/metafacture/statistics/CooccurrenceMetricCalculator.java

@@ -98,13 +98,23 @@ enum Metric {
 
     private final List<Metric> metrics = new ArrayList<Metric>();
 
+    /**
+     * Constructs a CooccurrenceMetricCalculator with given metrics.
+     *
+     * @param allMetrics the Metrics as a comma separated String
+     */
     public CooccurrenceMetricCalculator(final String allMetrics) {
         setMinCount(MIN_COUNT);
         for (final String metric : allMetrics.split("\\s*,\\s*")) {
             metrics.add(Metric.valueOf(metric));
         }
     }
 
+    /**
+     * Constructs a CooccurrenceMetricCalculator with given metrics.
+     *
+     * @param metrics the Metrics as an array
+     */
     public CooccurrenceMetricCalculator(final Metric... metrics) {
         setMinCount(MIN_COUNT);
         for (final Metric metric : metrics) {

metafacture-statistics/src/main/java/org/metafacture/statistics/UniformSampler.java

@@ -49,6 +49,11 @@ public final class UniformSampler<T> extends
 
     private long count;
 
+    /**
+     * Constructs a UniformSampler with a given sample size.
+     *
+     * @param sampleSize the size of the sample
+     */
     public UniformSampler(final int sampleSize) {
         this.sampleSize = sampleSize;
         sample = new ArrayList<T>(sampleSize);