This method returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.
public int indexOf(Object o)
Parameters: This function has a single parameter, i.e, the element to be searched in the list.
Returns: This method returns the index of first occurrence of the given element in the list and returns “-1” if element is not in the list.
Below programs show the implementation of this method.
[1, 3, 5, 7] 2
Program 2: Below is the code to show implementation of list.hashCode() using Linkedlist.
[10, 15, 20] 2
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