How to find index position of an element in a list when contains returns true

Question

I ve got a List of HashMap so I m using List contains to find out if the list contains a specified HashMap  In case it does  I want to fetch that element from the list  so How do I find out index position of where the element is       List benefit   new ArrayList        HashMap map   new HashMap        map put  one    1        benefit add map       HashMap map4   new HashMap        map4 put  one    1         System out println  size      benefit size         System out println  does it contain orig      benefit contains map        System out println  does it contain new      benefit contains map4         if  benefit contains map4             how to get index position where map4 was found in benefit list

User · Answer

indexOf object   get index

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benefit indexOf map4    It either returns an index or -1 if the items is not found   I strongly recommend wrapping the map in some object and use generics if possible

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List indexOf

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Here is an example   List lt String gt  names  names add  toto    names add  Lala    names add  papa    int index   names indexOf  papa       index   2

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Use List indexOf     This will give you the first match when there are multiple duplicates

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int indexOf    can be used  It returns -1 if no matching finds

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int   indexOf Object o  This method returns the index in this list of the first occurrence of the specified element  or -1 if this list does not contain this element

[java] How to find index position of an element in a list when contains returns true

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