Java获取两个数中较小的值 java获取两个数组的交集

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//取两个数组的交集
private String[] intersect(String[] arr1, String[] arr2){
        if (CheckUtils.isEmpty(arr1) && CheckUtils.isEmpty(arr2)) {
            return null;
        }
        if (CheckUtils.isEmpty(arr1)) {
            return arr2;
        }
        if (CheckUtils.isEmpty(arr2)) {
            return arr1;
        }
        List<String> l2 = Arrays.asList(arr2);
        String[] result = new String[arr1.length >= arr2.length ? arr1.length : arr2.length];
        for (int i = 0; i < arr1.length; i++) {
            if (l2.contains(arr1[i])) {
                result[i] = arr1[i];
            }
        }
        return result;
    }

//判空方法
public static boolean isEmpty(Object obj) {
        if (obj == null) {
            return true;
        }
        if (obj instanceof String && obj.toString().trim().length() == 0) {
            return true;
        }
        if (obj.getClass().isArray() && Array.getLength(obj) == 0) {
            return true;
        }
        if (obj instanceof Collection && ((Collection) obj).isEmpty()) {
            return true;
        }
        if (obj instanceof Map && ((Map) obj).isEmpty()) {
            return true;
        }
        return false;
    }