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Fixed Algorithm Structure in the Template Method Pattern

Keep the Java Template Method skeleton stable so subclasses vary steps without silently changing the overall algorithm contract.

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Template Method pays off only if the algorithm structure really should remain fixed.

What “Fixed” Means

The base type should own:

  • step ordering
  • non-negotiable lifecycle phases
  • shared preconditions or cleanup structure

Subclasses should not be able to rewrite the whole story casually.

Review Rule

If every subclass needs a different sequence, the algorithm is not truly fixed and Template Method is probably the wrong abstraction.

Revised on Thursday, April 23, 2026