/**
* Stop tracking the specified id
*
* @param name The timer's id
* @return the elapsed time
*/
public long stop(String name) {
if (times.containsKey(name)) {
long startTime = times.remove(name);
return System.currentTimeMillis() - startTime;
} else throw new RuntimeException("Timer id doesn't exist.");
}
/**
* Start tracking a time with name as id.
*
* @param name The timer's id
*/
public void start(String name) {
times.put(name, System.currentTimeMillis());
}