I was given this UML class diagram and asked to code them in java. I have a hard time understanding class diagrams so if you could also explain the logic of this, it will be amazing!

pkg When a new order is created its ID field should be the value of lastOrderld plus one, and then that value should be stored as lastOrderld. Use java.util.Date Order Menultem id:int lastOrderld: int - order Placed : Date Customer name : String phoneNumber : String price : double + Order() + getid): int + getOrderPlaced() : Date + totalPrice(): double + getPrice(): double Table Booking The added delivery fee is based on distance to the restaurant: 0-5 km: 5 5-10 km: 12 10+ km: 25 Home Delivery - address : String distanceToRestaurant : double delivery Wanted : Date +*+ totalPrice(): double SERVICE_FEE: double = 10.0 tableWanted : Date + totalPrice(): double