public class Main {

	public static void main(String[] args) {
		int n = 10000;
		
		startTimer();
		String s1 = repeatString1("hoge", n);
		printTime();
		
		startTimer();
		String s2 = repeatString2("hoge", n);
		printTime();
		
		System.out.println(s1.equals(s2));
	}

	public static String repeatString1(String s,int n) {
		String ret = "";
		for(int i=0;i<n;i++) {
			ret += s;
		}
		return ret;
	}
	
	public static String repeatString2(String s,int n) {
		StringBuilder sb = new StringBuilder();
		for(int i=0;i<n;i++) {
			sb.append(s);
		}
		return sb.toString();
	}

	private static long stime;
	private static void startTimer() {
		stime = System.nanoTime();
	}
	private static void printTime() {
		System.out.println((System.nanoTime() - stime) / 1000 + " us");
	}
}