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public class Timer {
    private long startTime;

    public Timer() {
        this.startTime = getMilliseconds();
    }

    public long getMilliseconds() {
        return System.nanoTime() / 1000000
    }

    public void restartTimer() {
        // Simply resets the startTime variable
        startTime = getMilliseconds();
    }

    // Retrieves the time (in milliseconds) since the timer was started
    public long getTime() 
        return getTime(false);
    }

    // Overloaded version of the above; set the flag to true to
    // reset the timer directly after retrieving the current time
    public long getTime(boolean flag)
        long t = getMilliseconds() - startTime;
        if(flag) restartTimer();
        return t;
    }
}