Question

Create a class to represent a Mammal object that inherits from (extends) the Animal class.

View javadoc for the Mammal class and updated Animal class in homework 4

http://comet.lehman.cuny.edu/sfakhouri/teaching/cmp/cmp326/s19/hw/hw4/

Use the description provided below in UML.

Mammal
- tailLength : double
- numLegs : int

+ Mammal()
+ Mammal(double, int)
+ Mammal(String, int, double, double, char, double, int) //pass values to parent’s overloaded constructor
                                                          //and assign valid values to tailLength, numLegs or -1 if invalid

+ setTailLength(double) : void    //if the value is invalid set tailLength to -1
+ getTailLength() : double
+ setNumLegs(int) : void           //if the value is invalid set numLegs to -1
+ getNumLegs() : int
+ printDetails() : void         @Override  //see Note1:
+ toString() : String         @Override  //see Note1:
+ equals(Object) : boolean     @Override  //see Note2:

NOTE1: 
For both the printDetails() and toString() methods include the data from the Animal class, as well as Mammal attributes.  Format the Mammal data as “Mammal: Tail Length: %10.2f | Number of Legs: %4d\n”
Hint: Use super.printDetails() and super.toString()

NOTE2:
For the equals(Object) method, two Mammal objects are considered equal if the 
parent class’s equals method returns true, 
if their numLegs are equal, 
and their tailLength values are within .1 of each other

View javadoc for the Mammal class and updated Animal class in homework 4

http://comet.lehman.cuny.edu/sfakhouri/teaching/cmp/cmp326/s19/hw/hw4/

Answer 1

public class Mammal extends Animal{
  
   //class instance variables
   private double tailLength;
   private int numLegs;
  
   //default constructor
   public Mammal() {
       super();
       //consider default values of the class parameters
       this.tailLength = 5;
       this.numLegs = 4;
   }
   //parameterized constructor
   public Mammal(double tailLength, int numLegs)
   {
       super();
       this.numLegs = numLegs;
       this.tailLength = tailLength;
   }
   //parameterized constructor
   public Mammal(String name, int birthYear, double weight, double height, char gender, double tailLength, int numLegs)
   {
       super(name, birthYear, weight, height);
       this.numLegs = numLegs;
       this.tailLength = tailLength;
   }
   //getter and setter methods
   public double getTailLength() {
       return tailLength;
   }
   public void setTailLength(double tailLength) {
       if(tailLength < 0) this.tailLength = -1;
       this.tailLength = tailLength;
   }
   public int getNumLegs() {
       return numLegs;
   }
   public void setNumLegs(int numLegs) {
       if(numLegs < 0) this.numLegs = -1;
       this.numLegs = numLegs;
   }  
  
   //method printDetails
   void printDetails() {
       //calling method of parent
       super.printDetails();
       System.out.println("Tail Lengths: " + getTailLength());
       System.out.println("Number of Legs: " + getNumLegs());
   }
  
   //method toString
   public String toString(){
       //calling method of parent
       String res = super.toString();
       res += "Tail Lengths: " + getTailLength() + "\n";
       res += "Number of Legs: " + getNumLegs();
       return res;
   }
  
   //equals method
   public boolean equals(Mammal data) {
       if(super.equals(data) && this.getNumLegs() == data.getNumLegs() && this.getTailLength() == data.getTailLength())
           return true;
       return false;
   }
  
}