Conversion Object[] to int[] error [duplicate]

Question

This question already has answers here:

Closed 8 years ago.

Possible Duplicate:
How to convert List<Integer> to int[] in Java?

I have an ArrayList and when I try to convert it into an Array of Integer because I need to do operations which concerns integer, I get this error :

incompatible types
required: int[]
found: java.lang.Object[]

Here's my code :

List<Integer> ids_rdv = new ArrayList<Integer>();

// I execute an SQL statement, then :
while (resultat.next()) {
    ids_rdv.add(resultat.getInt("id_rdv"));
}
int[] element_rdv_id = ids_rdv.toArray(); //Problem

Do you have any idea about that?

Answer 1

Assuming your original objects were instances of the Integer class:

Integer[] element_rdv_id = ids_rdv.toArray(new Integer[0]);

Answer 2

incompatible types required: int[] found: java.lang.Object[]

when you do ids_rdv.toArray(), it returns an array of Objects, that can't be assigned to array of primitive integer types.

You need to get an array of Integer objects in hand, so write it this way

Integer[] element_rdv_id = ids_rdv.toArray(new Integer[]);