这是我的秒表课。我的问题是，我怎样才能将它转换为秒，以便它在几秒钟内给我输出？提前致谢
public class StopWatch
{
/**
Constructs a stopwatch that is in the stopped state
and has no time accumulated.
*/
public StopWatch()
{
reset();
}
/**
Starts the stopwatch. Time starts accumulating now.
*/
public void start()
{
if (isRunning) return;
isRunning = true;
startTime = System.currentTimeMillis();
}
/**
Stops the stopwatch. Time stops accumulating and is
is added to the elapsed time.
*/
public void stop()
{
if (!isRunning) return;
isRunning = false;
long endTime = System.currentTimeMillis();
elapsedTime = elapsedTime + endTime - startTime;
}
/**
Returns the total elapsed time.
@return the total elapsed time
*/
public long getElapsedTime()
{
if (isRunning)
{
long endTime = System.currentTimeMillis();
return elapsedTime + endTime - startTime;
}
else
return elapsedTime;
}
/**
Stops the watch and resets the elapsed time to 0.
*/
public void reset()
{
elapsedTime = 0;
isRunning = false;
}
private long elapsedTime;
private long startTime;
private boolean isRunning;
}