Question

Java Programming

The following is about creating a class Fish and testing it. In every part, correct any syntax errors
indicated by NetBeans until no such error messages.
(i) Create a class Fish with the attributes name and price. The attributes are used to store the name
and the price of the fish respectively. Choose suitable types for them. You can copy the class
Counter on p.17 of the unit and modify the content. Copy the content of the file as the answers
to this part. No screen dump is recommended to minimize the file size.
(ii) Create another class TestFish with a method main() to test the class Fish. You can copy the
class TestCounter on p.42 and modify the content. In main(), create a fish object fishA and
print the message "An object fishA of class Fish has been created". Run the
program. Copy the content of the file and the output showing the message as the answers to this
part.
(iii) Add a method setPrice() to the Fish class with appropriate parameter(s) and return type to set
the price of the fish. Copy the content of the method as the answers to this part.
(iv) Add another method getName() to the Fish class with appropriate parameter(s) and return type
to get the name of the fish. Copy the content of the method as the answers to this part. You should
create other setter/getter methods in your class file but no marks are allocated for them since they
are similar to the ones here and in part (iii).
(v) Write another method increasePrice(double amount) of the Fish class which increases the
price by amount. Copy the content of the method as the answers to this part.
(vi) In the class TestFish, add the following before the end of main():
• set the name of the fish object to "Salmon" using the method setName();
• set the price to 98 using the method setPrice();
• increase the price by 3 using the method increasePrice();
• print the current price after getting it using the method getPrice();
Run the program. Copy the content of the class and the output as the answers to this part.

(c)
(i) Write a method isCheap() which does not have any parameters and returns true if the price is
less than 30 and false otherwise. Copy the content of the method as the answers to this part.
(ii) Write a method category() which returns the category of the fish as a string using a switchcase
statement. The category of the fish is determined by the following table.
Category price
"Expensive" not less than 90
"Medium" 30 to less than 90
"Cheap" less than 30
Copy the content of the method as the answers to this part.
(iii) Write a method generateBar(char ch) which prints price and a simple graph formed by ch.
One character ch is printed for every value of 10 and rounding is done on the remaining part. For
example, the call aFish.generateBar('*') generate the following output:
33.8 ***
where aFish is an object of Fish with price being 33.8. You are required to use a for loop to
generate the bar. Copy the content of the method as the answers to this part.

(iv) Create another class TestFish2 with a method main() to test the new methods in class Fish.
You need to perform the tasks:
• create a fish object fishB;
• set the price to 33.8 using the method setPrice() and set the name to "Sardine" using an
appropriate method;
• make use of the methods getName() and isCheap(), print the name and the result of calling
isCheap();
• make use of the method category(), print the category of fishB;
• use the method generateBar() to print a simple graph of for fishB using "*";
• create another fish object fishC.
Run the program. Copy the content of the class and the output as the answers to this part.

Answer 1

Explanation::

• Code in JAVA is given below
• Screenshots of the OUTPUT are given at the end of the code

Code in JAVA::

Fish.java Code::

public class Fish {
   private String name;
   private double price;
  
   public Fish() {
   }

   /**
   * @return the name
   */
   public String getName() {
       return name;
   }

   /**
   * @param name the name to set
   */
   public void setName(String name) {
       this.name = name;
   }

   /**
   * @return the price
   */
   public double getPrice() {
       return price;
   }

   /**
   * @param price the price to set
   */
   public void setPrice(double price) {
       this.price = price;
   }
  
   public void increasePrice(double amount) {
       this.price=this.price+amount;
   }
  
   public boolean isCheap() {
       if(this.price<30) {
           return true;
       }
       return false;
   }
   public String category() {
       /**
       * We can't use switch statement for range values
       **/
       if(this.price>=90) {
           return "Expensive";
       }else if(this.price>=30 && this.price<90) {
           return "Medium";
       }else {
           return "Cheap";
       }
   }
   public void generateBar(char ch) {
       int barLength=(int)(this.price/10);
       System.out.print(this.price+" ");
       for(int i=1;i<=barLength;i++) {
           System.out.print(ch);
       }
       System.out.println();
   }
}

TestFish.java::

public class TestFish {

   public static void main(String[] args) {
       Fish fishA = new Fish();
       System.out.println("An object fishA of class Fish has been created");
      
       /**
       * Setting the name
       * */
       fishA.setName("Salmon");
      
       /**
       * Setting the price
       * */
       fishA.setPrice(98);
      
       /**
       * Increasing the price by 3
       * */
       fishA.increasePrice(3);
      
       /**
       * Printing the current price
       * */
       System.out.println("Current price is "+fishA.getPrice());

   }

}

Output 1:

TestFish2.java Code::

public class TestFish2 {

   public static void main(String[] args) {
       Fish fishB = new Fish();
       /**
       * Setting the price
       * */
       fishB.setPrice(33.8);
      
       /**
       * Setting the name
       **/
       fishB.setName("Sardine");
      
       /**
       * Calling getName() and isCheap()
       * */
       System.out.print(fishB.getName()+" is ");
       if(fishB.isCheap()) {
           System.out.println("Cheap");
       }else {
           System.out.println("Not Cheap");
       }
      
       /**
       * Printing category
       * */
       System.out.println("Category is "+fishB.category());
      
       /**
       * Generating the bar
       * */
       fishB.generateBar('*');

   }

}

OUTPUT::

Please provide the feedback!!

Thank You!!