Java Spliterator getComparator() Method

The getComparator() method of Java Interface Spliterator is used to get a Comparator if the given Spliterator?s source is SORTED by a Comparator. It returns null if the source is SORTED in a natural order. Otherwise, if the source is not SORTED, throws IllegalStateException.

Syntax

Following is the declaration of getComparator() method-

Parameter

This method does not accept any parameter.

Return

The getComparator() method would return a comparator or a null value if the elements were sorted in the natural order.

Exceptions

IllegalStateException- This method has thrown an exception if the spliterator does not report a characteristic of SORTED.

Compatibility Version

Java 1.8 and above

Example 1

import java.util.*;
public class InterfaceSpliteratorGetComparatorExample1 {  
	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 getComparator 
            System.out.println("" + splitr.getComparator());
            }
}

Test it Now

Output:

Exception in thread "main" java.lang.IllegalStateException
	at java.base/java.util.Spliterator.getComparator(Spliterator.java:465)
	at myPackage.InterfaceSpliteratorGetComparatorExample1.main(InterfaceSpliteratorGetComparatorExample1.java:16)

Example 2

import java.util.*;
public class InterfaceSpliteratorGetComparatorExample2 {  
	public static void main (String[] args) {
        SortedSet<Test> set = new TreeSet<>((o1, o2) -> o1.str.compareTo(o2.str));
        set.add(new Test("two"));
        set.add(new Test("one"));
        Spliterator<Test> s = set.spliterator();
        System.out.println(s.getComparator());
        System.out.println(set);
      }
      private static class Test {
        private final String str;

        private Test (String str) {
            this.str = str;
        }
        @Override
        public String toString () {
            return "Test{str='" + str + "'}";
        }
      }
}

Test it Now

Output:

myPackage.InterfaceSpliteratorGetComparatorExample2$$Lambda$1/1639622804@18e8568
[Test{str='one'}, Test{str='two'}]

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Java Spliterator Class