Size of ArrayList

Its very important to know the size of ArrayList as it is required in most of the times while coding

We have size() method in ArrayList class which helps us to determine the size of ArrayList

Size is the number of elements in that ArrayList

  1. public int size()
public int size()

Example :

  1. import java.util.*;
  2.  
  3. public class ArrayListSize {
  4.     public static void main(String[] args) {
  5.     ArrayList<Integer> list = new ArrayList<Integer>();
  6.       list.add(14);
  7.       list.add(7);
  8.       list.add(21);
  9.       list.add(28);
  10. list.add(35);
  11. list.add(42);    
  12. System.out.println("Initial Size of ArrayList: "+list.size());
  13.         list.remove(1);
  14.         list.remove(2);
  15.         System.out.println("Size after removing 2 elements: "+list.size());
  16.         System.out.println("Final ArrayList after removal of 2 elements: ");
  17.         for(int ele: list){
  18.             System.out.println(ele);
  19.         }
  20.     }
  21. }
import java.util.*;

public class ArrayListSize {
	public static void main(String[] args) {
	ArrayList<Integer> list = new ArrayList<Integer>();
      list.add(14);
      list.add(7);
      list.add(21);
      list.add(28);
list.add(35);
list.add(42);	 
System.out.println("Initial Size of ArrayList: "+list.size());
        list.remove(1);
        list.remove(2);
        System.out.println("Size after removing 2 elements: "+list.size());
        System.out.println("Final ArrayList after removal of 2 elements: ");
        for(int ele: list){
            System.out.println(ele);
        }
	}
}

Here Size just tells how many elements are present in the arraylist

Don’t get confuse size with capacity in the Arraylist, we will talk about capacity separately

Just remember Size() returns number of elements present in ArrayList

Remember size() is a method , not a variable in the ArrayList class.

About the Author

Karibasappa G C (KB)
Founder of javainsimpleway.com
I love Java and open source technologies and very much passionate about software development.
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