HashMap is a class in Java that implements Map interface.It is an unsorted and unordered map whereas ArrayList implements List interface and maintains insertion order.Here we will try to convert a HashMap into an ArrayList.
Let us define a HashMap first.
At first,let us see how to get list of keys from a HashMap.There is an implicit method defined in java library to get the list of keys of a HashMap.And after getting the list of keys, construct an ArrayList with it.
Similarly, extract the values of a HashMap and construct an ArrayList out of it as below:
Now let us constuct a single ArrayList having both the keys and values of a HashMap in a single shot.
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