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  1. package com.company;
  2.  
  3. public class Semaforo {
  4.  
  5.  
  6.     public enum State{On,Off,Change,Flashing, ToString}
  7.     private State stato;
  8.  
  9.     public Semaforo(){
  10.         stato=State.Off;
  11.         System.out.println("Rosso");
  12.  
  13.  
  14.     }
  15.  
  16.     public String ToString(){
  17.         String s=" ";
  18.        
  19.     }
  20.  
  21.     public void On() {
  22.         if (stato ==State.On) {
  23.             System.out.println("Verde");
  24.         }
  25.         else if (stato == State.Change) {
  26.             System.out.println("Giallo");
  27.         }
  28.     }
  29.  
  30.     public void Off(){
  31.         if(stato==State.On)
  32.         stato=State.Off;
  33.     }
  34.  
  35.  
  36.  
  37.     public void Change(){
  38.         if(stato==State.On){
  39.             System.out.println("rosso");
  40.         }
  41.         else{
  42.             if(stato==State.Off){
  43.                 System.out.println("spento");
  44.             }
  45.         }
  46.  
  47.  
  48.  
  49.     }
  50.  
  51.  
  52.     public void Flashing(){
  53.  
  54.  
  55.     }
  56.  
  57.  
  58.  
  59. }
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