Android™ How to Program, Second Edition

Execises

J.3 Define each of the following terms:

a) Collection

b) Collections

c) Comparator

d) List

e) HashMap

f) ObjectOutputStream

g) File

h) ObjectOutputStream

i) byte-based stream

j) character-based stream

J.4 Briefly answer the following questions:

a) What is the primary difference between a Set and a Map?

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

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

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.

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