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I want to do something like
Set <String[]> strSet = new HashSet <String[]> ();
Is there an easy way to make a Set of arrays in Java, or do I have to code my own implementation? Adding an object to a Set checks the Object using equals(), which does not work for arrays.
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Java Array to Set We can convert an array into List using Arrays. asList() method, then use it to create a Set.
Create the Set by passing the Array as parameter in the constructor of the Set with the help of Arrays. asList() method.
Create a Set object. Add elements to it. Create an empty array with size of the created Set. Convert the Set to an array using the toArray() method, bypassing the above-created array as an argument to it.
int[] arr = { 2, 6, 4 , 2, 3, 3, 1, 7 }; Set<Integer> set = new HashSet<Integer>( ); Collections.
Arrays don't override equals and hashCode, and so the HashSet will compare them based on reference equality only. Consider using Lists instead:
Set<List<String>> strSet = new HashSet<List<String>>();
From the List.equals documentation:
Returns
trueif and only if the specified object is also a list, both lists have the same size, and all corresponding pairs of elements in the two lists are equal.
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