Implementations

Java

<highlightsyntax language="java122"> public class ExecutionTimer {

 private long start;
 private long end;

 public ExecutionTimer() {
   reset();
 }

 public void start() {
   start = System.currentTimeMillis();
 }

 public void end() {
   end = System.currentTimeMillis();
 }

 public long duration(){
   return (end-start);
 }

 public void reset() {
   start = 0;  
   end   = 0;
 }

 public static void main(String s[]) {
   // simple example
   ExecutionTimer t = new ExecutionTimer();
   t.start();
   for (int i=0; i < 80; i++){ System.out.print(".");}
   t.end();
   System.out.println("\n" + t.duration() + " ms");
 }

}

</highlightsyntax> See this HowTo to format a duration in ms into a string as "Days , Hours , minutes and seconds".

Ruby

class ExecutionTimer
  def initialize
    reset
  end
  def start
    @start = Time.now
  end
  def end
    @end = Time.now
  end
  def duration
    @end - @start
  end
  def reset
    @start = @end = nil
  end
end

t = ExecutionTimer.new
t.start
80.times {print "."; sleep 0.001}
t.end
puts "\n#{t.duration} sec"