Java Programming: There is an error in the code so make sure to fix it: OrderedMergeIterator.java import java.util.Iterator; import java.util.Map; import java.util.PriorityQueue; import java.util.Queue; public class OrderedMergeIterator> implements Iterator { private Queue>> queue; public OrderedMergeIterator(Iterator... iterators) { queue = new PriorityQueue<>((entry1, entry2) -> entry1.getKey().compareTo(entry2.getKey())); for (Iterator iterator : iterators) { if (iterator.hasNext()) { DataElement element = iterator.next(); queue.add(Map.entry(element, iterator)); } } } @Override public boolean hasNext() { return !queue.isEmpty(); } @Override public DataElement next() { if (hasNext()) { Map.Entry> entry = queue.poll(); DataElement element = entry.getKey(); Iterator iterator = entry.getValue(); if (iterator.hasNext()) { DataElement nextElement = iterator.next(); queue.add(Map.entry(nextElement, iterator)); } return element; } throw new RuntimeException("No more elements in the merge iterator"); } } Attached is an image of the errors:
Java
OrderedMergeIterator.java
import java.util.Iterator;
import java.util.Map;
import java.util.PriorityQueue;
import java.util.Queue;
public class OrderedMergeIterator<DataElement extends Comparable<? super DataElement>> implements Iterator<DataElement> {
private Queue<Map.Entry<DataElement, Iterator<DataElement>>> queue;
public OrderedMergeIterator(Iterator<DataElement>... iterators) {
queue = new PriorityQueue<>((entry1, entry2) -> entry1.getKey().compareTo(entry2.getKey()));
for (Iterator<DataElement> iterator : iterators) {
if (iterator.hasNext()) {
DataElement element = iterator.next();
queue.add(Map.entry(element, iterator));
}
}
}
@Override
public boolean hasNext() {
return !queue.isEmpty();
}
@Override
public DataElement next() {
if (hasNext()) {
Map.Entry<DataElement, Iterator<DataElement>> entry = queue.poll();
DataElement element = entry.getKey();
Iterator<DataElement> iterator = entry.getValue();
if (iterator.hasNext()) {
DataElement nextElement = iterator.next();
queue.add(Map.entry(nextElement, iterator));
}
return element;
}
throw new RuntimeException("No more elements in the merge iterator");
}
}
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