Java Reference
In-Depth Information
51 System.out.print(
Ð{ Ñ
);
52
for
(String element : s)
53 {
54 System.out.print(element);
55 System.out.print(
Ð Ñ
);
56 }
57 System.out.println(
Ð}Ñ
);
58 }
59 }
703
704
Output
Add name, Q when done:
Dick
{ Dick }
Add name, Q when done:
Tom
{ Tom Dick }
Add name, Q when done:
Harry
{ Harry Tom Dick }
Add name, Q when done:
Tom
{ Harry Tom Dick }
Add name, Q when done:
Q
Remove name, Q when done:
Tom
{ Harry Dick }
Remove name, Q when done:
Jerry
{ Harry Dick }
Remove name, Q when done:
Q
S
ELF
C
HECK
1.
Arrays and lists remember the order in which you added elements; sets
do not. Why would you want to use a set instead of an array or list?
2.
Why are set iterators different from list iterators?
Q
UALITY
T
IP
16.1 Use Interface References to
Manipulate Data Structures
It is considered good style to store a reference to a
HashSet
or
TreeSet
in a
variable of type
Set
.
Set
<String> names = new
HashSet
<String>();
