Android™ How to Program, Second Edition

Answers to Self-Review Exercises

J.1

a) Iterator.

b) index.

c) autoboxing.

d) ArrayList, Vector.

e) auto-unboxing.

f) shutdown.

g) synchronized.

J.2

a) False. Autoboxing occurs when adding a primitive type to a collection, which means the primitive type is converted to its corresponding type-wrapper class.

b) False. A Set cannot contain duplicate values.

c) False. A Map cannot contain duplicate keys.

d) True.

e) False. Collections is a class; Collection is an interface.

f) True.

g) True.

h) False. Text files are human readable in a text editor. Binary files might be human readable, but only if the bytes in the file represent ASCII characters.

i) True.