Public Method headMap

abstract SortedMap headMap(Object toKey)

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Returns a view of the portion of this sorted map whose keys are strictly less than toKey. The returned sorted map is backed by this sorted map, so changes in the returned sorted map are reflected in this sorted map, and vice-versa. The returned map supports all optional map operations that this sorted map supports. The map returned by this method will throw an IllegalArgumentException if the user attempts to insert a key outside the specified range.