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  1. Implement a version of the program to calculate prime numbers that we saw in Chapter 4 to use a Vector object instead of an array to store the primes. (Hint – remember the Integer class.)

  2. Write a program to store a deck of 52 cards in a linked list in random sequence using a Random class object. You can represent a card as a two character string – "1C" for the ace of clubs, "JD" for the jack of diamonds, and so on. Output the cards from the stack as four hands of 13 cards.

  3. Extend the program from the chapter that used a map to store names and telephone numbers such that you can enter a number to retrieve the name.

  4. Implement a phone book so that just a surname can be used to search and have all the entries corresponding to the name display.

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