Context - Future Perfect is usually used when you are stressing that something will have taken place before the time in the future that is being mentioned:

Example -

James - Hey Kyle! Do you have that money you owe me? I really need it to pay my rent tomorrow!

Kyle - No, but don't worry. Someone is coming over to buy my car today, so by tomorrow I will have received it, and will be able to pay you.

1) Cuando vuelvas del trabajo mañana, yo habré cocinado una buena cena para ti.

    When you come back from work tomorrow, I will have cooked you a nice dinner.

2) Cuando tenga cincuenta años, yo habré comprado una casa.

    When I am fifty, I will have bought a house.

3) El proximo año cuando te vayas allá, tú habrás hecho mucho dinero.

    Next year when you go there, you will have made a lot of money.

4) Mañana a las doce, alguien habrá ganado la medalla del oro.

    Tomorrow at twelve, someone will have won the gold medal.

5) A las tres este tarde, el perro habra comido su comida porque es alimentada al medio dia.

    At three this afternoon, the dog will have eaten his food, because he gets fed at noon.

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