Use Template Method hooks in Java when subclasses need optional extension points without overriding the whole algorithm.
Hook methods are optional extension points in a Template Method design. They usually have a default implementation and can be overridden by subclasses when needed.
Hooks let the base class offer variation points without forcing every subclass to implement every step.
Too many hooks make the template harder to reason about. If subclass variation becomes too open-ended, the pattern may be losing the stability that justified it.
Hooks should be few, purposeful, and clearly named around the algorithm stage they affect.