Question

in Java Write a method called randomNumber that returns a random floating-point number in the range of [-20.0, 50.0). (hints: use Random class in the method)

Answer 1

I have coded the method randomNumber() as per specification and it is given below

public static double randomNumber() {
       Random rand = new Random();
       double min = -20.0, max = 50;
       return min + rand.nextDouble() * (max - min + 1);
   }

To test that function, I have written the main() method as well. So you run this code.

RandomNum.java
-----------------
public class RandomNum
{
   public static double randomNumber() {
       Random rand = new Random();
       double min = -20.0, max = 50;
       return min + rand.nextDouble() * (max - min + 1);
   }
  
   public static void main(String[] args) {
       System.out.println("Generating 10 random numbers between -20.0 and 50.0");
       for(int i = 1; i <= 10; i++)
           System.out.println(randomNumber());
   }
}

output
-----
Generating 10 random numbers between -20.0 and 50.0
-15.0698547159618
-1.0377579310862828
39.55919323170632
20.833752383962484
39.657093777193964
33.93026732784858
11.417199650024767
-8.539447874452527
30.298596656006687
48.4347660758347