I have write the code as:
public class Solution { public int[] intersection(int[] nums1, int[] nums2) { HashSet<Integer> has1 = new HashSet(Arrays.asList(nums1)); for (int i: has1) System.out.println(i); return nums1; } } num1: [1,2,4,2,3] num2: [4,5,6,3] On the for loop it says java.lang.ClassCastException: [I cannot be cast to java.lang.Integer
you cannot do this directly but you need to prefer a indirect approach
int[] a = { 1, 2, 3, 4 }; Set<Integer> set = new HashSet<>(); for (int value : a) { set.add(value); } for (Integer i : set) { System.out.println(i); } using Java 8
1) Set<Integer> newSet = IntStream.of(a).boxed().collect(Collectors.toSet());//recomended 2) IntStream.of(a).boxed().forEach(i-> System.out.println(i)); //applicable here first foreach is sufficient for you and If you want to go by set, go with second for loop
Your collection is containing Integer objects, so while iterating through foreach loop, you should write for (Integer i : collection) - that is because primitive type int do not have its own Iterator implementation.
intandIntegerare not the same type. Fix the type in theforand it should work.new HashSet<>(IntStream.of(nums1).boxed().collect(Collectors.toList())), you're currently getting aHashSet<int[]>and using a raw-type so you're also ignoring a warning.