weka.core
Interfaces 
AdditionalMeasureProducer
Copyable
Drawable
Matchable
OptionHandler
Randomizable
Summarizable
Undoable
WeightedInstancesHandler
Classes 
Attribute
AttributeStats
BinarySparseInstance
CheckOptionHandler
ContingencyTables
FastVector
Instance
InstanceComparator
Instances
Matrix
Memory
Optimization
Option
ProtectedProperties
Queue
RandomVariates
Range
RTSI
SelectedTag
SerializedObject
SingleIndex
SparseInstance
SpecialFunctions
Statistics
Stopwords
SystemInfo
Tag
Utils
Version
Exceptions 
NoSupportForMissingValuesException
UnassignedClassException
UnassignedDatasetException
UnsupportedAttributeTypeException
UnsupportedClassTypeException
WekaException