Posted in: Java Collections
The Iterator is an interface, used to traverse through the elements of a Collection. It is not advisable to modify the collection itself while traversing an Iterator.
The Iterator interface has three fundamental methods:
The Iterator interface has three fundamental methods:
- Object next()
- boolean hasNext()
- void remove()
By repeatedly calling the next method, you can visit the elements from the collection one by one. However, if you reach the end of the collection, the next method throws aNoSuchElementException. Therefore, you need to call the hasNext method before calling next. That method returns true if the iterator object still has more elements to visit. If you want to inspect all elements in a container, you request an iterator and then keep calling the next method while hasNext returns true.