unity change material from list code example

Example: how to declare a material array unity

using UnityEngine; using System.Collections;   public class arrayDemo : MonoBehaviour {     System.Random random = new System.Random();          // Set the materials in the inspector     public Material[] myMaterials = new Material[5];      // Use this for initialization     void Start ()     {         // Assigns a random material at start         gameObject.renderer.material = myMaterials[random.Next(0,myMaterials.Length)];     } }