It is one of advanced level java interview questions- Device an algorithm to merge list of Iterators into a single Iterator. Google guava provides collections framework which does it in couple of lines.
Below lines shows how to merge multiple iterators and provide single iterator out of it.
Sample Output:-
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Below lines shows how to merge multiple iterators and provide single iterator out of it.
Iterable<Integer> iterable = Iterables.concat(list1, list2,list3, list4); Iterator<Integer> iterator = iterable.iterator();
Sample program demonstrating above concept
package javacore; import java.util.ArrayList; import java.util.Arrays; import java.util.Iterator; import java.util.List; import com.google.common.collect.Iterables; public class IteratorOverAlIteratorsGuava { /** * @param args */ public static void main(String[] args) { Iterator<Integer> iterator = iterators(); while (iterator.hasNext()) { System.out.println(iterator.next()); } } public static Iterator<Integer> iterators() { List<Integer> list1 = new ArrayList<>(); list1.add(0); list1.add(1); list1.add(2); List<Integer> list2 = Arrays.asList(3, 4); List<Integer> list3 = new ArrayList<>(); List<Integer> list4 = Arrays.asList(5, 6, 7, 8, 9); final Iterable<Integer> iterable = Iterables.concat(list1, list2, list3, list4); final Iterator<Integer> iterator = iterable.iterator(); return iterator; } }
Sample Output:-
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