Java Iterator - 不能从静态上下文中引用非静态方法 getID()

Question

Keep on getting this same error.

public int getNumberOfAmbulances(int area) {
    Iterator<Ambulance> it = ambulances.iterator();
    while(it.hasNext()) {
        Ambulance tk = it.next();
        return (Ambulance.getID());
    }
}

"Non-static method getID() cannot be referenced from a static context"

Answer 1

getID() in Ambulance class is not static that means it can only be accessed using an object. Either make that method static or call getID() like this : tk.getID()