Java Reference
In-Depth Information
them in the same order that you created them.
Figure 7-2
is a diagram showing the normal
arrangement.
Figure 7-2. Linked list structure
Of course, the Collections API provides a
LinkedList
class; here is a simple program that
uses it:
public
public class
class
LinkedListDemo
LinkedListDemo
{
public
public static
void
main
(
String
[]
argv
) {
System
.
out
.
println
(
"Here is a demo of Java's LinkedList class"
);
LinkedList
<
String
>
l
=
new
static
void
new
LinkedList
<>();
l
.
add
(
new
new
Object
().
toString
());
l
.
add
(
"Hello"
);
l
.
add
(
"end of the list"
);
System
.
out
.
println
(
"Here is a list of all the elements"
);
ListIterator li
=
l
.
listIterator
(
0
);
while
while
(
li
.
hasNext
())
System
.
out
.
println
(
"Next to: "
+
li
.
next
());
iif
(
l
.
indexOf
(
"Hello"
) <
0
)
System
.
err
.
println
(
"Lookup does not work"
);
else
else
System
.
err
.
println
(
"Lookup works"
);
// Now, for added fun, let's walk the linked list backwards.
while
while
(
li
.
hasPrevious
()) {
System
.
out
.
println
(
"Back to: "
+
li
.
previous
());
}
