How to find length of ArrayList in Java

By using  size() method of ArrayList class we can easily determine the size of the ArrayList. This method returns the number of elements of ArrayList.

public int size()

Example:

package beginnersbook.com;
import java.util.ArrayList;
public class Details
{
    public static void main(String [] args)
    {
        ArrayList<Integer> al=new ArrayList<Integer>();
        System.out.println("Initial size: "+al.size());
        al.add(1);
        al.add(13);
        al.add(45);
        al.add(44);
        al.add(99);
        System.out.println("Size after few additions: "+al.size());
        al.remove(1);
        al.remove(2);
        System.out.println("Size after remove operations: "+al.size());
        System.out.println("Final ArrayList: ");
        for(int num: al){
            System.out.println(num);
        }
   }
}

Output:

Initial size: 0
Size after few additions: 5
Size after remove operations: 3
Final ArrayList: 
1
45
99