public void ManagedUpdate()
{
switch (state)
{
case STATE.KEY:
key.ManagedUpdate();
break;
case STATE.NOISY:
noisy.ManagedUpdate();
break;
case STATE.GARBAGE:
garbage.ManagedUpdate();
break;
default:
Debug.Log("何かがおかしいよ！ at Item ManagedUpdate()");
break;
}
}