Java Spliterator getExactSizeIfKnown() Method

The getExactSizeIfKnown() method of Java Interface Spliterator is used to get an estimateSize() of the SIZED spliterator, otherwise returns -1.

Syntax

Following is the declaration of getExactSizeIfKnown() method-

Parameter

This method does not accept any parameter.

Return

The getExactSizeIfKnown() method returns the estimateSize() of the spliterator, if known, otherwise returns -1.

Exceptions

Compatibility Version

Java 1.8 and above

Example 1

import java.util.*;
public class InterfaceSpliteratorGetExactSizeIfKnownExample1 {  
     public static void main(String args[]){
    	   //Create an array list
         ArrayList<Integer> list = new ArrayList<>();             
         //Add values in the list.
         list.add(1001);
         list.add(-2001);
         list.add(3001);
         list.add(-4001);                                                     
         //Getting Spliterator object
         Spliterator<Integer> splitr = list.spliterator(); 
         //Print Estimate Size 
         System.out.println("Estimate size: " + splitr.estimateSize());
         //Print getExactSizeIfKnown 
         System.out.println("Exact size: " + splitr.getExactSizeIfKnown());
         //Printelements of arraylist.              
         System.out.println("Elements of arraylist-- ");     
         while(splitr.tryAdvance((n) -> System.out.println(n)));
         }
}

Test it Now

Output:

Estimate size: 4
Exact size: 4
Elements of arraylist-- 
1001
-2001
3001
-4001

Example 2

import java.util.*;
public class InterfaceSpliteratorGetExactSizeIfKnownExample2 {  
    public static void main(String args[]){
   	    List<String> nameList = Arrays.asList("Rahul", "Nikki", "Prem");
   	    Spliterator<String> splitr = nameList.spliterator();
   	    //splitr.tryAdvance(System.out::println);
   	    System.out.println("Exact size before getting List elements: " +splitr.getExactSizeIfKnown());
   	    splitr.forEachRemaining(System.out::println);
   	    //Print getExactSizeIfKnown 
          System.out.println("Exact size after getting List elements: " + splitr.getExactSizeIfKnown());   	
          }
}

Test it Now

Output:

Exact size before getting List elements: 3
Rahul
Nikki
Prem
Exact size after getting List elements: 0

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Java Spliterator Class