IDEA中找不到ArrayUtils工具类的问题

    //控制台输入数组并且倒序输出
    public static void putIn() {
        int[] arr = new int[5];
        Scanner input = new Scanner(System.in);
        for (int i = 0;i < arr.length; i++) {
            System.out.println("请输入第" + (i+1) + "个数");
            arr[i] = input.nextInt();
        }
//        for (int i = arr.length-1;i >= 0; i--) {
//            System.out.println("倒序输出为：" + arr[i]);
//        }
        ArrayUtils.reverse(arr);
        System.out.println("倒序输出为：" + Arrays.toString(arr));
    }

		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-lang3</artifactId>
			<version>3.5</version>
		</dependency>