"Will Have Done" tense- meaning and examples

Looking for sufficient definitions and explanations of this tense, I noticed that one meaning will usually refer to something someone "will have done" as something that "will have been done\completed". While I do realize this is one independent reason to use this tense, I don't quite get a lot by a definition of a tense which uses the tense it attempts to define. It would really help me if someone could clarify the subject, including regarding similar forms, such as: Will Have: gone, finished, completed, ended...All(Or most V3 verbs).

Answer

This tense is called Future II simple

Usage

• action that will have been finished by a future time

Example: Don’t worry, he will have repaired the bike by then.

• supposition about what happened

Example: He will probably have noticed that his bike is broken.

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