Question

1. define a class that has three different constructors.

2.

write code that overrides the following method

public double sqr(double num1) {

return num1*num1;

}

Answer 1

public class Num {
   private double number;

   // default constructor
   Num() {
       number = 0;
   }

   // parameterized constructor
   Num(double i) {
       number = i;
   }

   // copy constructor
   Num(Num n) {
       this.number = n.getNumber();
   }

   public double getNumber() {
       return number;
   }

   public void setNumber(double aNumber) {
       number = aNumber;
   }

   public double sqr(double num1) {

       return num1 * num1;

   }

   public static void main(String[] args) {
       Num n = new Num(5);
       System.out.println(n.sqr(10));
   }
}