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AbstractCollection size() Method in Java with Examples
  • Last Updated : 26 Nov, 2018
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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 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 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 Collectoin
        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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