The size() method of Java AbstractCollection is used to get the size of the Collection or the number of elements present in the Collection.
Syntax:
AbstractCollection.size()
Parameters: The method does not take any parameter.
Return Value: The method returns the size or the number of elements present in the collection.
Below programs illustrates the use of AbstractCollection.size() method:
Program 1:
Java
// Java code to illustrate size()import java.util.*;import java.util.AbstractCollection;public class AbstractCollectionDemo { public static void main(String args[]) { // Creating an empty Collection AbstractCollection<String> abs = new TreeSet<String>(); // Use add() method to add // elements into the Collection abs.add("Welcome"); abs.add("To"); abs.add("Geeks"); abs.add("4"); abs.add("Geeks"); abs.add("TreeSet"); // Displaying the Collection System.out.println("Collection: " + abs); // Displaying the size of the collection System.out.println("The size of the Collection is: " + abs.size()); }} |
Output:
Collection: [4, Geeks, To, TreeSet, Welcome] The size of the Collection is: 5
Program 2:
Java
// Java code to illustrate size()import java.util.*;import java.util.AbstractCollection;public class AbstractCollectionDemo { public static void main(String args[]) { // Creating an empty Collection AbstractCollection<String> abs = new LinkedList<String>(); // Using add() method to add // elements in the Collection abs.add("Geeks"); abs.add("for"); abs.add("Geeks"); abs.add("10"); abs.add("20"); // Displaying the Collection System.out.println("Collection:" + abs); // Displaying the size of the Collection System.out.println("The size of the Collection is: " + abs.size()); }} |
Output:
Collection:[Geeks, for, Geeks, 10, 20] The size of the Collection is: 5
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