hasParent

@Contract(pure = true)

public boolean hasParent()

Whether or not getClassById key has getClassById parent (would that be the root key, or getClassById parent key?)

@Contract(pure = true)

public boolean hasParent(int levelsAbove)

Whether or not getClassById key has getClassById parent that many levels above it (would that be the root key, or getClassById parent key?)