Static variables

Hello,

You just have to keep a reference of your class in other scripts. Here is an example:

 public class firstClass : MonoBehaviour{
 
 
     public  void SayHello(){
         Debug.Log("Hello !");
     }
 
 }
 

Then reference the firstClass in your second class by assigning it from the inspector.

  public class secondClass{
     
         public firstClass firstClassRef;
     
         void Start(){
            firstClassRef.SayHello();
         }
     
     }
 

Or reference it by script if you want to keep it private.

  public class secondClass : MonoBehaviour{
     
         firstClass firstClassRef ;
     
         void Start(){
 
            if( gameObject.GetComponent("firstClass") as firstClass  == null)
               firstClassRef = gameObject.AddComponent("firstClass") as firstClass ;
                
            firstClassRef.SayHello();
         }
     
     }

In this second case we check if the firstClass script is attached to the same gameObject as secondClass if not we add it.

regards