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BJP3 Exercise 12.1: starString

Language/Type: Java recursion recursive programming
Author: Whitaker Brand (on 2013/04/01)

Write a method starString that accepts an integer parameter n and returns a string of stars (asterisks) 2n long (i.e., 2 to the nth power). For example:

Call Output Reason
starString(0); "*" 20 = 1
starString(1); "**" 21 = 2
starString(2); "****" 22 = 4
starString(3); "********" 23 = 8
starString(4); "****************" 24 = 16

You should throw an IllegalArgumentException if passed a value less than 0.

Type your solution here:


This is a method problem. Write a Java method as described. Do not write a complete program or class; just the method(s) above.

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