INHERITANCE AND POLYMORPHISM - Introduction to Java Programming: Comprehensive Version - page 434

3 public class TestArrayList {
4

public static void main(String[] args) {

5 // Create a list to store cities

create ArrayList

6 ArrayList<String> cityList = new ArrayList<>();

7
8 // Add some cities in the list
9 cityList.add( "London" );
10 // cityList now contains [London]
11 cityList.add( "Denver" );
12 // cityList now contains [London, Denver]
13 cityList.add( "Paris" );
14 // cityList now contains [London, Denver, Paris]
15 cityList.add( "Miami" );
16 // cityList now contains [London, Denver, Paris, Miami]
17 cityList.add( "Seoul" );
18 // Contains [London, Denver, Paris, Miami, Seoul]
19 cityList.add( "Tokyo" );
20

add element

// Contains [London, Denver, Paris, Miami, Seoul, Tokyo]

21
22 System.out.println( "List size? " + cityList.size());
23 System.out.println( "Is Miami in the list? " +
24 cityList.contains( "Miami" ));
25 System.out.println( "The location of Denver in the list? "
26 + cityList.indexOf( "Denver" ));
27 System.out.println( "Is the list empty? " +
28

list size

contains element?

element index

cityList.isEmpty()); // Print false

is empty?

29
30 // Insert a new city at index 2
31 cityList.add( 2 , "Xian" );
32 // Contains [London, Denver, Xian, Paris, Miami, Seoul, Tokyo]

33
34 // Remove a city from the list

35 cityList.remove( "Miami" );

remove element

36 // Contains [London, Denver, Xian, Paris, Seoul, Tokyo]

37
38 // Remove a city at index 1
39 cityList.remove( 1 );
40

remove element

// Contains [London, Xian, Paris, Seoul, Tokyo]

41
42 // Display the contents in the list
43 System.out.println(cityList.toString());
44
45 // Display the contents in the list in reverse order
46 for ( int i = cityList.size() - 1 ; i >= 0 ; i--)
47 System.out.print(cityList.get(i) + " " );
48 System.out.println();
49
50 // Create a list to store two circles
51 ArrayList<CircleFromSimpleGeometricObject> list
52 = new ArrayList<>();
53
54 // Add two circles
55 list.add( new CircleFromSimpleGeometricObject( 2 ));
56 list.add( new CircleFromSimpleGeometricObject( 3 ));
57
58 // Display the area of the first circle in the list
59 System.out.println( "The area of the circle? " +
60 list.get( 0 ).getArea());
61 }
62 }

toString()

get element

create ArrayList