weka.core
Interfaces 
AdditionalMeasureProducer
Copyable
Drawable
Matchable
OptionHandler
Summarizable
WeightedInstancesHandler
Classes 
Attribute
Attributes
AttributeStats
BinarySparseInstance
CheckOptionHandler
Combinations
ContingencyTables
FastVector
Instance
Instances
Matrix
Option
Permutations
Queue
Range
SelectedTag
SerializedObject
SparseInstance
SpecialFunctions
Statistics
Tag
Utils
Exceptions 
UnassignedClassException
UnassignedDatasetException
UnsupportedAttributeTypeException
UnsupportedClassTypeException
WekaException