Array of `Goods` Objects

public class StoreArray
{

  public static void main ( String[] args )
  {
    Goods[] inventory =  new Goods[10];
    inventory[0] = new Goods( "bubble bath", 1.40 );
    inventory[1] = new Food ( "ox tails", 4.45, 1500 );
    inventory[2] = new Book ( "Emma", 24.95, "Austen" );
    inventory[3] = new Toy  ( "Leggos", 54.45, 8 );

    inventory[0].display();
    inventory[1].display();
    inventory[2].display();
    inventory[3].display();
  }
}

The modified testing program uses an array.

Since each child class is-a Goods, an array of type Goods[] can be used for any of them. The array inventory has 10 cells, but the program uses only 4 of them.

Each cell of the array is a reference variable which can refer to an object of type Goods or to any derived class of Goods.

Here is the output of the program:


C:\Temp>javac StoreArray.java

C:\Temp>java StoreArray
item: bubble bath price: 1.4
item: ox tails price: 4.45
calories: 1500.0
item: Emma price: 24.95
author: Austen
item: Leggos price: 54.45
minimum age: 8

QUESTION 18:

(Review:) Does this line:

inventory[1].display();

execute the same display() method as this line:

inventory[2].display();

Answer:

Array of Goods Objects

QUESTION 18:

Array of `Goods` Objects