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AbstractCollection size() Method in Java with Examples

  • Last Updated : 19 May, 2021
Geek Week

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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