统计程序运行时间

public class Client {
	public static void main(String[] args) {
		long start = System.currentTimeMillis();
		long sum = 0L;
		for (long i = 0; i < Integer.MAX_VALUE; i++) {
			sum += i;
		}
		long end = System.currentTimeMillis();
		System.out.println(">>>>>>>>>>Total spent time: " + (end - start) / 1000 + "s");
	}
}