weka.core
Interfaces 
AdditionalMeasureProducer
Copyable
Drawable
Matchable
OptionHandler
Randomizable
SoftClassifiedInstance
Summarizable
WeightedInstancesHandler
Classes 
AlgVector
Attribute
AttributeStats
BinarySparseInstance
CheckOptionHandler
ContingencyTables
DistanceFunction
DynamicArrayOfPosInt
EuclideanDistance
FastVector
Instance
Instances
KDTree
Matrix
Optimization
Option
Pair
ProtectedProperties
Queue
RandomVariates
Range
SelectedTag
SerializedObject
SoftClassifiedFullInstance
SoftClassifiedInstances
SoftClassifiedSparseInstance
SparseInstance
SpecialFunctions
Statistics
Tag
Utils
Exceptions 
NoSupportForMissingValuesException
UnassignedClassException
UnassignedDatasetException
UnsupportedAttributeTypeException
UnsupportedClassTypeException
WekaException