Java Reference
In-Depth Information
EXAMPLE
for
(
Integer
element : numberList)
element = 42;
numberList
is an
ArrayList
with base type
Integer
. This for-each loop changes the value
of each element of
numberList
to 42. (This example uses automatic boxing. So,
42
really
means
new
Integer(42)
.)
A good way to read the first line of the example is “For each
element
in
numberList
, do the
following.”
Display 14.2
A for-each Loop Used with an
ArrayList
(part 1 of 2)
1
import
java.util.ArrayList;
2
import
java.util.Scanner;
3
public class
ArrayListDemo
4{
5
public static void
main(String[] args)
6
{
7
ArrayList<String> toDoList =
new
ArrayList<String>(20);
8
System.out.println(
9
"Enter list entries, when prompted.");
10
boolean
done =
false
;
11
String next =
null
;
12
String answer;
13
Scanner keyboard =
new
Scanner(System.in);
14
while
(! done)
15
{
16
System.out.println("Input an entry:");
17
next = keyboard.nextLine();
18
toDoList.add(next);
System.out.print("More
items
for
the
list? ");
19
20
answer = keyboard.nextLine();
21
if
(!(answer.equalsIgnoreCase("yes")))
22
done =
true
;
23
}
24
System.out.println("The list contains:");
25
for
(String entry : toDoList)
26
System.out.println(entry);
27
}
28
}
29
