CODEWITHSUNDEEP
javaclasscastexception
AKIWEB
AKIWEB

Reputation: 19632

java.lang.ClassCastException: [Ljava.lang.Object; incompatible with [Ljava.lang.String;

I am trying to retrieve random elements from a linkedhashset. Below is my code but it is giving me exception everytime.

private static void generateRandomUserId(Set<String> userIdsSet) {

    Random rand = new Random(System.currentTimeMillis());
    String[] setArray = (String[]) userIdsSet.toArray();
    for (int i = 0; i < 10; ++i) {
        System.out.println(setArray[rand.nextInt(userIdsSet.size())]);
    }
}

Below is the exception I am getting-

java.lang.ClassCastException: [Ljava.lang.Object; incompatible with [Ljava.lang.String;

Can anyone help me on this? And is there any better way of doing this?

Upvotes: 1

Views: 17828

Answers (1)

assylias
assylias

Reputation: 328913

Try this:

String[] setArray = userIdsSet.toArray(new String[userIdsSet.size()]);

the toArray method that takes no arguments returns an Object[] which can't be cast to a String[]. The other version returns a typed array.

Upvotes: 11

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