Java取两个int数组的交集和并集

Java取两个int数组的交集和并集的代码如下：

public class ArrayIntersectionUnion {
    public static void main(String[] args) {
        int[] arr1 = { 1, 2, 3, 4, 5 };
        int[] arr2 = { 4, 5, 6, 7, 8 };

        // 求交集
        Set<Integer> intersection = new HashSet<Integer>();
        for (int i = 0; i < arr1.length; i++) {
            for (int j = 0; j < arr2.length; j++) {
                if (arr1[i] == arr2[j]) {
                    intersection.add(arr1[i]);
                    break;
                }
            }
        }
        System.out.println("Intersection: " + intersection);

        // 求并集
        Set<Integer> union = new HashSet<Integer>();
        for (int i = 0; i < arr1.length; i++) {
            union.add(arr1[i]);
        }
        for (int j = 0; j < arr2.length; j++) {
            union.add(arr2[j]);
        }
        System.out.println("Union: " + union);
    }
}

运行结果如下：

Intersection: [4, 5]
Union: [1, 2, 3, 4, 5, 6, 7, 8]