public static void main(String[] args) {
long start = System.currentTimeMillis();
for(int i = 0; i < 1000000; i++) {
System.out.println("x");
}
long end = System.currentTimeMillis();
System.out.println(end - start);
System.out.println(d.getTime());
}原文：http://blog.51cto.com/357712148/2158318