Java Collections - emptyIterator() Method

The java.util.Collections.emptyIterator() method returns an iterator that has no elements. More precisely:

• hasNext always returns false.
• next always throws NoSuchElementException.
• remove always throws IllegalStateException.

Syntax

public static <T> Iterator<T> emptyIterator()

Here, T is the type of element, if there were any, in the iterator.

Parameters

No parameter is required.

Return Value

Returns an empty iterator.

Exception

NA.

Example:

In the example below, the java.util.Collections.emptyIterator() method is used to create an empty iterator.

import java.util.*;

public class MyClass {
  public static void main(String[] args) {
    //creating an empty Iterator
    Iterator<Integer> Itr = Collections.emptyIterator();

    //print the content of the Iterator
    while(Itr.hasNext()) {
      System.out.println(Itr.next());
    }
    System.out.println("Iterator is empty.");
  }
}

The output of the above code will be:

Iterator is empty.