Java find square root of a number:

import java.util.*;
class  RootMaker
{
    public static void main(String[] args) 
    {
        Scanner input=new Scanner(System.in);
        System.out.println("Enter Number: ");
        int num=input.nextInt();
        if(num>0){
        double root=Math.sqrt(num);
        System.out.println("Square root of "+num+" is: "+root);
        }
        else{
        System.out.println("Negative Input!");
        }
    }
}