Conversion of collection to int array

for (Integer value : c) {
    int i = value.intValue();
    //do something with either value or i
}

Assuming the values are of type Integer, you can try this:

Collection c = Sort.values();
Integer[] a = (Integer[])(c.toArray(new Integer[c.size()]));

Simply:

Integer[] yourArrayVar = yourCollectionVar.toArray(new Integer[0]);

java just needs to know what kind of array to produce.

The question was: conversion to int array
Integer[] can not be assigned to int[] or vice versa

int[] array = c.stream().mapToInt( i -> i ).toArray();

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