import java.util.ArrayList; import java.util.List; /* Hello, I'm a minimal model of an Zoo */ public class Zoo1 { private String name; private List<Object> objects; public Zoo1(String aName) { this.name = aName; this.objects = new ArrayList<>(); } public void add(Object aObject) { this.objects.add(aObject); } public int getTotalWeight() { int totalWeight = 0; for (Object eachObject: this.objects) totalWeight += eachObject.getWeight(); return totalWeight; } }