Magic 8 ball program loop?

I have created a simple magic 8 ball program. But the issue is every single time I compile my program and run the loop the loop keeps on repeating the same random answer. The issue is not about the loop going on forever its when I compile it and run it, the program gives a random answer but keeps on repeating the same answer till i recompile the file.

import java.util.Random;
import java.util.Scanner;

public class Moreloopex4 {

    public Moreloopex4() {
        // TODO Auto-generated constructor stub
    }

    public static void main(String[] args) {
        // Declaring Random
        Random rand = new Random();

        // Declaring scanner
        Scanner scan = new Scanner(System. in );

        // Declaring variables
        String input;
        int randnum;

        // Declaring randomizer
        randnum = rand.nextInt(6) + 0;

        // Conditional Statements
        while (true) {
            System.out.println("Enter your statement");
            input = scan.nextLine();
            if (randnum == 0) {
                System.out.println("Without a doubt ");
            }
            else if (randnum == 1) {
                System.out.println("I cannot predict now");
            }
            else if (randnum == 2) {
                System.out.println("My sources say no");
            }
            else if (randnum == 3) {
                System.out.println("Signs point to yes");
            }
            else if (randnum == 4) {
                System.out.println("Don't count on it");
            }
            else if (randnum == 5) {
                System.out.println("Better not tell you now");
            }
            else if (randnum == 6) {
                System.out.println("Yes, definetly");
            }
        }
    }
}