Android How to Program, 3/e

Exercises

1. J.3 Define each of the following terms:

   1. Collection

   2. Collections

   3. Comparator

   4. List

   5. HashMap

   6. ObjectOutputStream

   7. File

   8. ObjectOutputStream

   9. byte-based stream

   10. character-based stream

2. J.4 Briefly answer the following questions:

   1. What is the primary difference between a Set and a Map?

   2. What happens when you add a primitive type (e.g., double) value to a collection?

   3. Can you print all the elements in a collection without using an Iterator? If yes, how?

3. J.5 (Duplicate Elimination) Write a program that reads in a series of first names and eliminates duplicates by storing them in a Set. Allow the user to search for a first name.

4. J.6 (Counting Letters) Modify the program of Fig. J.9 to count the number of occurrences of each letter rather ...