Peeking Iterator 2021-10-04 12:41
class PeekingIterator implements Iterator<Integer> {
private Iterator<Integer> iterator;
private Integer next;
public PeekingIterator(Iterator<Integer> iterator) {
// initialize any member here.
this.iterator = iterator;
this.next = iterator.next();
}
// Returns the next element in the iteration without advancing the iterator.
public Integer peek() {
return next;
}
// hasNext() and next() should behave the same as in the Iterator interface.
// Override them if needed.
@Override
public Integer next() {
Integer ret = next;
next = iterator.hasNext() ? iterator.next() : null;
return ret;
}
@Override
public boolean hasNext() {
return next != null;
}
}
| Runtime | Memory |
|---|---|
| 4 ms | 38.4 MB |
EOF