View difference between Paste ID: VYLz97HM and CFWKWjAz

 public abstract class Item {
     private String name;
     private double weight;
     private double value;
 
     public String getName()   { return name;   }
     public double getWeight() { return weight; }
     public double getValue()  { return value;  }
 
     public void setName(String name)     { this.name = name;     }
     public void setWeight(double weight) { this.weight = weight; }
     public void setValue(double value)   { this.value = value;   }
 }
 
 public abstract class Container extends Item {
     private Item[] content = new Item[0];
 
     public Item getItem(int index) { return content[index]; }
     public void addItem(Item item) {
         //Dorzuć nowy przedmiot do tablicy
         int numberOfItems = content.length;
         Item[] tempContent = new Item[numberOfItems+1];
         for (int i = 0; i < numberOfItems; ++i)
             tempContent[i] = content[i];
         tempContent[numberOfItems] = item;
 		content = tempContent;
 
         //Zwiększ wagę kontenera
         double currentWeight = getWeight();
         double newWeight = currentWeight + item.getWeight();
         setWeight(newWeight);
     }
 }
 
 //Dwie klasy do testowania
 public class Rock extends Item {
     public Rock(double weight, double value) {
         setName("Rock");
         setWeight(weight);
         setValue(value);
     }
 }
 public class Chest extends Container {
     public Chest(double weight, double value) {
         setName("Chest");
         setWeight(weight);
         setValue(value);
     }
 }
 
 public class Main {
     public static void main(String[] args) {
         Container chest1 = new Chest(10, 20);
         Container chest2 = new Chest(15, 20);
         Item rock1 = new Rock(5, 0);
         Item rock2 = new Rock(5, 0);
 
         chest1.addItem(rock1);
         chest2.addItem(rock2);
         chest1.addItem(chest2);
 
         System.out.println("Waga chest1: " + chest1.getWeight());
     }
 }