Question

Assume you have created the following data definition class:

public class Book {
   private String title;
   private double cost;
  
   public String getTitle() { return this.title; }
   public double getCost() { return this.cost; }
  
   public void setTitle(String title) {
      this.title = title;
   }

// Mutator to return true/false instead of using exception handling
public boolean setCost(double cost) {
      if (cost >= 0 && cost < 100) {
         this.cost = cost;
         return true;
      }
      else {
         return false;
      }
   }
  
   public double calculateSalePrice(double tax) {
      return this.getCost() * (1+tax);
   }
}

Change the mutator, setTitle(String title), to be a mutator that returns a Boolean if a title could be set, if it contains at least 10 characters

Answer 1

public class Book {
    private String title;
    private double cost;

    public String getTitle() {
        return this.title;
    }

    public double getCost() {
        return this.cost;
    }

    public boolean setTitle(String title) {
        if (title.length() >= 10) {
            this.title = title;
            return true;
        }
        return false;
    }

    // Mutator to return true/false instead of using exception handling
    public boolean setCost(double cost) {
        if (cost >= 0 && cost < 100) {
            this.cost = cost;
            return true;
        } else {
            return false;
        }
    }

    public double calculateSalePrice(double tax) {
        return this.getCost() * (1 + tax);
    }
}