Type Parameters:

T - The type of value that is being counted.

All Superinterfaces:

BucketingSystem<T>

All Known Subinterfaces:

MutableHistogram<T>

All Known Implementing Classes:

ConcurrentHistogram, ImmutableHistogram
```
public interface Histogram<T>
extends BucketingSystem<T>
```
This is a data structure that holds frequency counts of values for use in a histogram. Since a histogram shows the number values within specified ranges, the structure only stores counts all values in each range.
"Buckets" (the ranges of counted values) are identified by an inclusive upper bound value. Values from negative infinity (or the equivalent in the given type) through the lowest upper bound value go into the first bucket; values greater than the highest upper bound value and up to positive infinity (or the equivalent) go in the last bucket.
Example: A Histogram of String values has 5 buckets, with upper bound values of "Apple", "Hewlett Packard", "Sun", and "Wang" (the last bucket never has an upper bound value, so there is no fifth upper bound value).
In this example histogram, here is how elements would be counted:
- A value "Acorn" would have gone in the first bucket since it's less-than-or-equal-to "Apple".
- If the second bucket has counted 5 values, that means that there must have been five values counted that were greater than "Apple" and less-than-or-equal-to "Hewlett Packard".
- A value "Tandem" would have gone in the fourth bucket since it's greater than "Sun" but less than or equal to "Wang".
- "Zenith" would go in the last (5th) bucket, since it's greater than the last upper-bound-value, "Wang".
See Also:

BucketingSystem

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  long countInBucket(int index)
  Get the number of elements that were counted in the specified bucket.
  - Methods inherited from interface com.pervasivecode.utils.stats.histogram.BucketingSystem
    bucketUpperBound, numBuckets

- Method Detail
  - countInBucket
```
long countInBucket(int index)
```
    Get the number of elements that were counted in the specified bucket. The first bucket has an index of 0.
    
    Parameters:
    
    index - The bucket number to examine.
    
    Returns:
    
    The count of values in the specified bucket.

Interface Histogram<T>

Method Summary

Methods inherited from interface com.pervasivecode.utils.stats.histogram.BucketingSystem

Method Detail

countInBucket