import java.util.ArrayList;
45
public class ArrayListCollection
6 {
7 public static void main(String[] args)
8 {
9 // create a new ArrayList of Strings with an initial capacity of 10
10 ArrayList<String> items = new ArrayList<String>();
11
12 items.add("red"); // append an item to the list
13 items.add(0, "yellow"); // insert "yellow" at index 0
14
15 // header
16 System.out.print(
17 "Display list contents with counter-controlled loop:");
18
19 // display the colors in the list
20 for (int i = 0; i < items.size(); i++)
21 System.out.printf(" %s", items.get(i));
22
23 // display colors using enhanced for in the display method
24 display(items,
25 "%nDisplay list contents with enhanced for statement:");
26
27 items.add("green"); // add "green" to the end of the list
28 items.add("yellow"); // add "yellow" to the end of the list
29 display(items, "List with two new elements:");
30
31 items.remove("yellow"); // remove the first "yellow"
32 display(items, "Remove first instance of yellow:");
33
34 items.remove(1); // remove item at index 1
35 display(items, "Remove second list element (green):");
36
37 // check if a value is in the List
38 System.out.printf("\"red\" is %sin the list%n",
39 items.contains("red") ? "": "not ");
40
41 // display number of elements in the List
42 System.out.printf("Size: %s%n", items.size());
43 }
44
45 // display the ArrayList's elements on the console
46 public static void display(ArrayList<String> items, String header)
47 {
48 System.out.printf(header); // display header
49
50 // display each element in items
51 for (String item : items)
52 System.out.printf(" %s", item);
53System.out.println();
55 }
56 }