Hi Experts,
I have a question. I have an object and want to insert in a text file. Before inserting, I want to check if it is duplicate. If no duplicate is found, I will insert the object. If yes, will not insert an object? Do I need a collection for this? This is for Java. Thank you!
Jump to PostYes, one of the easiest ways to detect duplicates is to use a Collection that does not allow duplicates, eg HashSet. Its
addmethod returns false if the set already contains that element.
Yes, one of the easiest ways to detect duplicates is to use a Collection that does not allow duplicates, eg HashSet. Its add method returns false if the set already contains that element.
HashSet<Object> or. HashSet<>. or just HashSet will allow any kind of object. Primitives will be automatically wrapped with the appropriate class.
Another way is to
Convert List to Set
Set s= new HashSet(list);Convert Set to List
List l=new ArrayList(s);
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