What is the difference between iterator and iterable Java?
Iterator is an interface, which has implementation for iterate over elements. Iterable is an interface which provides Iterator.
Is a Map an iterable Java?
First of all, we cannot iterate a Map directly using iterators, because Map are not Collection. Since all maps in Java implement Map interface, following techniques will work for any map implementation (HashMap, TreeMap, LinkedHashMap, Hashtable, etc.)
Does Map implement Iterable interface?
The downside of this approach is Map is not an Iterable object, since it doesn’t implement the Iterable Interface. We have to use keys() method to get access to an Iterable object, which will be used to iterate over the keys.
Does Map inherit from iterable?
To be blunt, Map in general (and HashMap in particular) do not implement Iterator because it is not clear what it should be iterating. There are three choices: Keys. Values.
Does iterator extends Iterable?
Implementing the Iterable interface allows an object to make use of the for-each loop. It does that by internally calling the iterator() method on the object. For example, the following code only works as a List interface extends the Collection interface, and the Collection interface extends the Iterable interface.
What does iterable do in Java?
The Java Iterable interface represents a collection of objects which is iterable – meaning which can be iterated. This means, that a class that implements the Java Iterable interface can have its elements iterated.
Does map extends Iterable?
Map does not extend Iterable.
Why is Map not a Collection?
Because they are of an incompatible type. List, Set and Queue provide iterate functionality over the value whereas Maps has keys to iterate over which is ultimately a Set and Values as Collection. …
Does Map extends Iterable?
Why is a Map not collection?
Maps work with key/value pairs , while the other collections work with just values . Map maps keys to values. It allows its content to be viewed as a set of keys, a collection of values and a set of key-value mappings. It’s part of the collection framework but it doesn’t implement the java.
Why should we use iterator?
The primary purpose of an iterator is to allow a user to process every element of a container while isolating the user from the internal structure of the container. This allows the container to store elements in any manner it wishes while allowing the user to treat it as if it were a simple sequence or list.