Java Spliterator estimateSize() Method

Last Updated : 17 Mar 2025

The estimateSize() method of Java Interface Spliterator is used to get an estimate of the number of elements remaining to iterate or returns Long.MAX_VALUE if infinite, unknown, or too expensive to compute.

Syntax

Following is the declaration of estimateSize() method-

Parameter

This method does not accept any parameter.

Return

The estimateSize() method returns the estimated size of elements or Long.MAX_VALUE if infinite, unknown, or too expensive to compute.

Exceptions

Compatibility Version

Java 1.8 and above

Example 1

import java.util.*;
public class InterfaceSpliteratorEstimateSizeExample1 {  
     public static void main(String args[]){
    	   //Create an array list
         ArrayList<Integer> al1 = new ArrayList<>();             
         //Add values in the list.
         al1.add(1);
         al1.add(-2);
         al1.add(3);
         al1.add(-4);                                                     
         //Getting Spliterator object
         Spliterator<Integer> splitr = al1.spliterator();  
         //Print EstimateSize 
         System.out.println("Estimate size of ArrayList: " + splitr.estimateSize());
         //Printelements of arraylist.              
         System.out.println("Elements of arraylist: ");     
         while(splitr.tryAdvance((n) -> System.out.println(n)));
         }
}

Output:

Estimate size of ArrayList: 4
Elements of arraylist: 
1
-2
3
-4

Example 2

import java.util.*;
public class InterfaceSpliteratorEstimateSizeExample2 {  
     public static void main(String args[]){
    	    List<String> nameList = Arrays.asList("Rahul", "Abhi", "Suresh", "Rani", "Nikki", "Rosy", "Prem");
    	   Spliterator<String> splitr = nameList.spliterator();
    	   //Print EstimateSize 
         System.out.println("Estimate size of List: " + splitr.estimateSize());   	
         }
}

Output:

Estimate size of List: 7

Example 3

import java.util.*;
public class InterfaceSpliteratorEstimateSizeExample3 {  
     public static void main(String args[]){
    	      List<String> names = new ArrayList<>();
    		names.add("Rahul");
    		names.add("Rohit");
    		names.add("Surya");    			
    		//Getting Spliterator object
    		Spliterator<String> namesSpliterator = names.spliterator();
    		System.out.println("Estimate size: " + namesSpliterator.estimateSize());
    		System.out.println("Name present in List:");
    		namesSpliterator.forEachRemaining(System.out::println);	
    		System.out.println("Again Estimate size is: " + namesSpliterator.estimateSize());
            }
}

Output:

Estimate size: 3
Name present in List:
Rahul
Rohit
Surya
Again Estimate size is: 0

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Java Spliterator estimateSize() Method

Syntax

Parameter

Return

Exceptions

Compatibility Version

Example 1

Example 2

Example 3

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