While loop with random number generator?

I am new to java coding and while loops are a little confusing to me.

For this program I am asked to generate a random number between 1 and 100, I think I've got that part down.

First the code would print out the random value, and then, if the number is even, it prints out that number of "*" characters, and if its odd, it prints out that number of "&" characters.

I know you could use like modulus to determine odd/even but I don't know how to print out a certain number of characters using the while loop, thanks!

Example output would be:

Random number generated: 8 The output pattern: ********

Random number generated:3 The output pattern: &&&