Answer:
public class Main
{
public static void main(String[] args) {
System.out.println(starString(4));
}
public static String starString(int n){
double p = Math.pow(2,n);
String s = "";
for(int i=0; i<p; i++)
s += "*";
return s;
}
}
Explanation:
Create a method named starString that takes an integer parameter, n
Get the 2 to the nth power using pow method and set it to the p
Create an empty string that will hold the asterisks
Create a for loop that will iterate p times. Inside the loop, concatenate an asterisk to the s
Return the s
Inside the main method, call the method with an integer parameter
