Question

Create a Mattress class should have fields for size (king, queen, twin), manufacturer, and price, and a constructor should set default values for each. Write set methods only for size and manufacturer. The set method for size adds $200 for king or $100 for queen. Add a toString() method that returns the data from all of the fields.

A child class named AdjustableMattress extends Mattress and adds a field for adjustment type (air or mechanical), with air being the default. Include a get and set method for this field, adding $400 for air and $500 for mechanical. Implement a constructor that accepts all fields and calls the Mattress constructor. A toString() method should call the parent class toString() and add to it the adjustment type.

An application named MattressDemo should thoroughly demonstrate the functionality of both classes.

Answer 1

Note : Plz check the following code and let me know if u need any changes...

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// Mattress.java

public class Mattress {
   private String size;
   private String manufacturer;
   private double price;

   public Mattress() {
       this.size = "";
       this.manufacturer = "";
       this.price = 0.0;
   }
  
   public Mattress(String size, String manufacturer) {
       this.size = size;
       this.manufacturer = manufacturer;
   }

   public void setSize(String size)
   {
       if(size.equalsIgnoreCase("king"))
       {
           price=200;
       }
       else if(size.equalsIgnoreCase("queen"))
       {
           price=300;
       }
   }
  
   public void setPrice(double price) {
       this.price = price;
   }
   public void setManufacturer(String manufacturer)
   {
       this.manufacturer=manufacturer;
   }
   @Override
   public String toString() {
       return "Size=" + size + ", manufacturer=" + manufacturer
               + ", price=" + price ;
   }
  
}

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// AdjustableMattress.java

public class AdjustableMattress extends Mattress {
   private String adjustmentType;

   public AdjustableMattress() {
       this.adjustmentType = "air";
   }

   public AdjustableMattress(String size, String manufacturer,
           String adjustmentType) {
       super(size, manufacturer);
       if (adjustmentType.equalsIgnoreCase("air"))
           setPrice(400);
       else if (adjustmentType.equalsIgnoreCase("mechanical"))
           setPrice(500);
   }

   public String getAdjustmentType() {
       return adjustmentType;
   }

   public void setAdjustmentType(String adjustmentType) {
       this.adjustmentType = adjustmentType;
   }

   @Override
   public String toString() {
       return super.toString() + " AdjustmentType=" + adjustmentType;
   }

}
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