Hash set

[lakshmibvaraprasad]

I have an array 'arr' with integers. I need to display only the unique values. I did this using hash array set and While executing I found an error like this ,

Exception in thread "main" java.lang.ArrayStoreException: [I
at java.util.AbstractCollection.toArray(AbstractColle ction.java:171)
at test.main(test.java:57)

Here is my logic I used to get unique values,

Set hashSet = new HashSet(Arrays.asList(arr));
String[] unique = (String[]) hashSet.toArray(new String[hashSet.size()]);

Can someone help me on this??

[Iron Lion]

The toArray() method of the collection classes works somewhat unintuitively. The correct syntax is:

String[] unique = new String[hashSet.size()];
hashSet.toArray(unique);

[JosAH]

The toArray() method of the collection classes works somewhat unintuitively. The correct syntax is:

String[] unique = new String[hashSet.size()];
hashSet.toArray(unique);

That's not it: the OP wants to store Integers in a String array (see the [I part in the Exception message).

kind regards,

Jos