Java时间戳计算代码执行时间

import java.util.Calendar;

public class TestTimestamp {
	public static void main(String[] args) {
		long t1 = System.currentTimeMillis(); // 代码执行前时间

		try {
			Thread.currentThread().sleep(3160);
		} catch (Exception err) {
			err.printStackTrace();
		}
		
		long t2 = System.currentTimeMillis(); // 代码执行后时间

		Calendar c = Calendar.getInstance();
		c.setTimeInMillis(t2 - t1);

		System.out.println("耗时: " + c.get(Calendar.MINUTE) + "分 "
				+ c.get(Calendar.SECOND) + "秒 " + c.get(Calendar.MILLISECOND)
				+ " 微秒");
	}
}