ProgrammingChallenge.java

public class ProgrammingChallenge {

	public static void main(String... args) {
		System.out.println(stringTimes("Hi", 5));
	}

	public static String stringTimes(String str, int n) {
		StringBuilder sb = new StringBuilder();
		if (n <= 0) {
			System.err.println("n must be > 0");
		} else {
			for (int i = 0; i < n; i++) {
				sb.append(str);
			}
		}
		return sb.toString();
	}

}