Question

Equals and Copy method activity Implement a Dog class with the following features: + Attributes: age, gender, weight + Method: constructor, copy constructor, equals (if same weight and gender), toString + A main method/driver that create an array of 5 Dog objects (obtain input from user), and then display the objects that are "equal"

Java

Answer 1

public class Dog {
  
   int age;
   char gender;
   double weight;
   public Dog(int age, char gender, double weight) {
       this.age = age;
       this.gender = gender;
       this.weight = weight;
   }
   public int getAge() {
       return age;
   }
   public void setAge(int age) {
       this.age = age;
   }
   public char getGender() {
       return gender;
   }
   public void setGender(char gender) {
       this.gender = gender;
   }
   public double getWeight() {
       return weight;
   }
   public void setWeight(double weight) {
       this.weight = weight;
   }
   public Dog(Dog other)
   {
       this.setAge(other.getAge());
       this.setGender(other.getGender());
       this.setWeight(other.getWeight());
   }
   public Dog()
   {}
  
  
   @Override
   public boolean equals(Object obj) {
       if (this == obj)
           return true;
       if (obj == null)
           return false;
       if (getClass() != obj.getClass())
           return false;
       Dog other = (Dog) obj;
       if (age != other.age)
           return false;
       if (gender != other.gender)
           return false;
       if (Double.doubleToLongBits(weight) != Double.doubleToLongBits(other.weight))
           return false;
       return true;
   }
   @Override
   public String toString() {
       return "Dog [age=" + age + ", gender=" + gender + ", weight=" + weight + "]";
   }
   public static void main(String[] args)
   {
       Dog[] array = new Dog[5];
       array[0] = new Dog(3,'m',23.3);
       array[1] = new Dog(4,'f',29.7);
       array[2] = new Dog(3,'m',23.3);
       array[3] = new Dog(5,'f',25.7);
       array[4] = new Dog(6,'m',43.3);
      
       for(int i= 0 ;i<array.length;i++)
       {
           for(int j = i+1;j<array.length;j++)
           {
               if(array[i].equals(array[j]))
                   System.out.println(array[i]+ " and "+ array[j]+ " are equal");
           }
       }  
   }
  
  

}

Dog [Java Application] C:\Program Files Java\dk1.8.0_112\ bin javaw.exe (Mar 24, 2019, 11:00:32 PM) Dog [age-3, gender-m, weight-23.3] and Dog [age-3, gender-m, weight-23.3] are equal