How to enable object by clicking on the button through the Massive(array)?

That is, you press a button and enabled the subsequent object in the Massive(array), and the previous turns off. Here is a script I wrote, just the fact that the loop is executed before I click on the button.

  using System.Collections;
     using System.Collections.Generic;
     using UnityEngine;
     
     public class MassiveRuss : MonoBehaviour 
     {
     public GameObject[] page;
     private static int Choose;
     public GameObject[] GetPage()
     {
     return page;
     
     }
     
     public void SetPage(GameObject[] A)
     {
     page = A;
     }
     
     void Start () 
     {
     
     }
     
     // Update is called once per frame
     void Update () 
     {
     switch (gameObject.name) 
     {
     case "Next":
     Choose = 0;
     Choose++;
     for (Choose = 0; Choose < 5; Choose++) 
     {
     page [Choose].SetActive (true);
     }
     Debug.Log (Choose);
     break;
     }
     /*for (int i = 0; i < 22; i++) 
     {
     page [i].SetActive (true);
     }*/
     
     }
     }