arraylist length

1aList.size()

1import java.util.ArrayList;
2
3/*
4 * Java Program to find the length of ArrayList. *
5 */
6
7public class ArrayListDemo{
8
9  public static void main(String[] args) {
10    System.out.println("Welcome to Java Program to find the length of array list");
11
12    ArrayList<String> listOfBanks = new ArrayList<>();
13    int size = listOfBanks.size();
14    System.out.println("size of array list after creating: " + size);
15
16    listOfBanks.add("Citibank");
17    listOfBanks.add("Chase");
18    listOfBanks.add("Bank of America");
19    size = listOfBanks.size();
20
21    System.out.println("length of ArrayList after adding elements: " + size);
22
23    listOfBanks.clear();
24    size = listOfBanks.size();
25    System.out.println("size of ArrayList after clearing elements: " + size);
26  }
27
28}
29Output
30Welcome to Java Program to find length of array list
31the size of array list after creating: 0
32the length of ArrayList after adding elements: 3
33the length of ArrayList after clearing elements: 0

1ArrayList<String> listOfBanks = new ArrayList<>(); 
2int size = listOfBanks.size(); 
3System.out.println("size of array list after creating: " + size);

1import java.util.ArrayList;
2public class ArrayListSizeMethodExample
3{
4   public static void main(String[] args)
5   {
6      ArrayList<Integer> al = new ArrayList<Integer>();
7      int s = al.size();
8      System.out.println("size of ArrayList: " + s);
9      al.add(25);
10      al.add(64);
11      al.add(73);
12      s = al.size();
13      System.out.println("size of ArrayList after adding elements: " + s);
14      al.clear();
15      s = al.size();
16      System.out.println("size of ArrayList after clearing elements: " + s);
17   }
18}

1list.size()

1import java.util.ArrayList;
2public class ArrayListSizeMethodExample
3{
4   public static void main(String[] args)
5   {
6      ArrayList<String> al = new ArrayList<String>();
7      int s = al.size();
8      System.out.println("size of ArrayList: " + s);
9      al.add("red");
10      al.add("blue");
11      al.add("green");
12      s = al.size();
13      System.out.println("size of ArrayList after adding elements: " + s);
14      al.clear();
15      s = al.size();
16      System.out.println("size of ArrayList after clearing elements: " + s);
17   }
18}