Java Collections Framework
Iterator interface: provides the facility of iterating the elements in forward direction only.
| 1 | public boolean hasNext() | It returns true if iterator has more elements. |
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| 2 | public Object next() | It returns the element and moves the cursor pointer to the next element. |
| 3 | public void remove() | It removes the last elements returned by the iterator. It is rarely used. |
Collection Interface: Root interface with basic methods like add(), remove(), contains(), isEmpty(),etc
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If you see above only add, remove methods are there. get() is not there.
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get() methods are implemented based on underlying data Structure .
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And add(Object) method is Object based, not index. Because these are generalized methods which will apply for all collection classes
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