import java.util.ArrayList; import java.util.AbstractCollection; public class Demo { public static void main(String[] args) { AbstractCollection<Object> absCollection = new ArrayList<Object>(); absCollection.add("Laptop"); absCollection.add("Tablet"); absCollection.add("Mobile"); absCollection.add("E-Book Reader"); absCollection.add("SSD"); absCollection.add("HDD"); System.out.println("AbstractCollection = " + absCollection); System.out.println("Count of Elements in the AbstractCollection = " + absCollection.size()); absCollection.remove("Tablet"); absCollection.remove("SSD"); System.out.println("Collection after removing some 2 elements = " + absCollection); System.out.println("Count of Elements in the updated AbstractCollection = " + absCollection.size()); } }