`/**

• The instance doesn't get created until the method is called for the first time.
  */
  public static synchronized ThreadSafeLazyLoadedIvoryTower getInstance() {
  if (instance == null) {
  synchronized (ThreadSafeLazyLoadedIvoryTower.class) {
  if (instance == null) {
  instance = new ThreadSafeLazyLoadedIvoryTower();
  }
  }
  }
  return instance;
  }`

Shouldn't we remove synchronized from method signature? I didn't find any explaination for this. Usually for lazy initialization we have synchronized only inside the method right?
What pros/cons are there for using synchronized in method signature?
Code reference