Is there a stopwatch in Java

Question

Is there a stopwatch in Java  On google I only find code of stopwatches which don t work - they always return 0 milliseconds   This code that I found doesn t work but I don t see why   public class StopWatch      private long startTime   0    private long stopTime   0    private boolean running   false      public void start         this startTime   System currentTimeMillis        this running   true          public void stop         this stopTime   System currentTimeMillis        this running   false            elaspsed time in milliseconds   public long getElapsedTime         long elapsed      if  running          elapsed    System currentTimeMillis   - startTime         else         elapsed    stopTime - startTime             return elapsed            elaspsed time in seconds   public long getElapsedTimeSecs         long elapsed      if  running          elapsed     System currentTimeMillis   - startTime    1000         else         elapsed     stopTime - startTime    1000             return elapsed

User · Answer

Now you can try something like   Instant starts   Instant now    Thread sleep 10   Instant ends   Instant now    System out println Duration between starts  ends      Output is in ISO 8601

User · Answer

Try this   public class StopWatch           private long startTime   0        private long stopTime   0         public StopWatch                       startTime   System currentTimeMillis                   public void start             startTime   System currentTimeMillis                   public void stop             stopTime   System currentTimeMillis            System out println  StopWatch      getElapsedTime       milliseconds             System out println  StopWatch      getElapsedTimeSecs       seconds                                  param process name                 public void stop String process name                stopTime   System currentTimeMillis                System out println process name     StopWatch      getElapsedTime       milliseconds                 System out println process name     StopWatch      getElapsedTimeSecs       seconds                            elaspsed time in milliseconds       public long getElapsedTime               return stopTime - startTime                   elaspsed time in seconds       public double getElapsedTimeSecs             double elapsed            elapsed     double  stopTime - startTime     1000          return elapsed               Usage   StopWatch watch   new StopWatch       do something watch stop      Console   StopWatch  143 milliseconds  StopWatch  0 143 seconds

User · Answer

Try this         calculates elapsed time in the form hrs mins secs     public class StopWatch        private Date startTime       public void startTiming                 startTime   new Date               public String stopTiming                 Date stopTime   new Date            long timediff    stopTime getTime   - startTime getTime    1000L          return DateUtils formatElapsedTime timediff               Use   StopWatch sw   new StopWatch        sw startTiming        String interval   sw stopTiming

User · Answer

Spring provides an elegant org springframework util StopWatch class  spring-core module   StopWatch stopWatch   new StopWatch     stopWatch start       Do something stopWatch stop     System out println stopWatch getTotalTimeMillis

User · Answer

Try this    import java util concurrent TimeUnit  import com google common base Stopwatch   public class StopwatchTest             public static void main String   args  throws Exception           Stopwatch stopwatch   Stopwatch createStarted            Thread sleep 1000   60           stopwatch stop       optional         long millis   stopwatch elapsed TimeUnit MILLISECONDS           System out println  quot Time in milliseconds  quot  millis           System out println  quot that took   quot    stopwatch

User · Answer

Simple out of the box Stopwatch  class   import java time Duration  import java time Instant   public class StopWatch        Instant startTime  endTime      Duration duration      boolean isRunning   false       public void start             if  isRunning                throw new RuntimeException  Stopwatch is already running                       this isRunning   true          startTime   Instant now               public Duration stop             this endTime   Instant now            if   isRunning                throw new RuntimeException  Stopwatch has not been started yet                      isRunning   false          Duration result   Duration between startTime  endTime           if  this duration    null                this duration   result            else               this duration   duration plus result                      return this getElapsedTime               public Duration getElapsedTime             return this duration             public void reset             if  this isRunning                this stop                      this duration   null            Usage   StopWatch sw   new StopWatch    sw start           doWork   sw stop    System out println  sw getElapsedTime   toMillis      ms

User · Answer

Use Guava s Stopwatch class      An object that measures elapsed time in nanoseconds  It is useful to   measure elapsed time using this class instead of direct calls to   System nanoTime   for a few reasons          An alternate time source can be substituted  for testing or performance reasons    As documented by nanoTime  the value returned has no absolute meaning  and can only be interpreted as relative to another timestamp   returned by nanoTime at a different time  Stopwatch is a more   effective abstraction because it exposes only these relative values    not the absolute ones       Stopwatch stopwatch   Stopwatch createStarted    doSomething    stopwatch stop       optional  long millis   stopwatch elapsed TimeUnit MILLISECONDS    log info  that took      stopwatch      formatted string like  12 3 ms

User · Answer

Use System currentTimeMillis   to get the start time and the end time and calculate the difference   class TimeTest1     public static void main String   args         long startTime   System currentTimeMillis         long total   0      for  int i   0  i  lt  10000000  i            total    i             long stopTime   System currentTimeMillis        long elapsedTime   stopTime - startTime      System out println elapsedTime            More info at this tutorial

User · Answer

The code doesn t work because elapsed variable in getElapsedTimeSecs   is not a float or double

User · Answer

You ll find one in  http   commons apache org lang   It s called  org apache commons lang time StopWatch   But it roughly does the same as yours  If you re in for more precision  use  System nanoTime     See also this question here   Time measuring overhead in Java

User · Answer

try this http   introcs cs princeton edu java stdlib Stopwatch java html  that s very easy  Stopwatch st   new Stopwatch       Do smth  here double time   st elapsedTime       the result in millis   This class is a part of stdlib jar

User · Answer

Performetrics provides a convenient Stopwatch class  just the way you need  It can measure wall-clock time and more  it also measures CPU time  user time and system time  if you need  It s small  free and you can download from Maven Central  More information and examples can be found here  https   obvj net performetrics  Stopwatch sw   new Stopwatch    sw start        Your code  sw stop    sw printStatistics System out       Sample output      ----------------- ---------------------- --------------       Counter                   Elapsed time   Time unit          ----------------- ---------------------- --------------       Wall clock time               85605718   nanoseconds         CPU time                      78000500   nanoseconds         User time                     62400400   nanoseconds         System time                   15600100   nanoseconds        ----------------- ---------------------- --------------    You can convert the metrics to any time unit  nanoseconds  milliseconds  seconds  etc      PS  I am the author of the tool

User · Answer

use   com google common base Stopwatch  its simple and easy     lt dependency gt   lt groupId gt com google guava lt  groupId gt   lt artifactId gt guava lt  artifactId gt   lt version gt 23 0 lt  version gt   lt  dependency gt    example    Stopwatch stopwatch   new Stopwatch    stopwatch start      Do something   logger debug  this task took     stopwatch stop   elapsedTime TimeUnit MILLISECONDS      mills      this task took 112 mills

User · Answer

Try this   Java Stopwatch Fully Working Solution  Here you will get a fully working solution   Just a snippet from the above-linked solution   You can create a class like below code and use this class  start and stop method before and after the code section  you want to measure the time taken   public class Stopwatch    private long startTime    private long stopTime            starting the stop watch         public void start            startTime   System nanoTime                  stopping the stop watch         public void stop           stopTime   System nanoTime               elapsed time in nanoseconds         public long time            return  stopTime - startTime          public String toString          return  elapsed time      time       nanoseconds             Thank you

User · Answer

try this  import java awt event     import java awt     import javax swing     public class millis extends JFrame implements ActionListener  Runnable             private long startTime       private final static java text SimpleDateFormat timerFormat   new java text SimpleDateFormat  mm   ss SSS         private final JButton startStopButton  new JButton  Start stop         private Thread updater       private boolean isRunning  false       private final Runnable displayUpdater  new Runnable                       public void run                               displayElapsedTime System currentTimeMillis   - millis this startTime                           public void actionPerformed ActionEvent ae                      if isRunning                              long elapsed  System currentTimeMillis   - startTime               isRunning  false               try                                     updater join                        Wait for updater to finish                             catch InterruptedException ie                  displayElapsedTime elapsed                   Display the end-result                     else                             startTime  System currentTimeMillis                 isRunning  true               updater  new Thread this                updater start                           private void displayElapsedTime long elapsedTime                      startStopButton setText timerFormat format new java util Date elapsedTime                 public void run                       try                             while isRunning                                      SwingUtilities invokeAndWait displayUpdater                    Thread sleep 50                                      catch java lang reflect InvocationTargetException ite                              ite printStackTrace System err                   Should never happen                      catch InterruptedException ie                 Ignore and return              public millis                       startStopButton addActionListener this            getContentPane   add startStopButton            setSize 100 50            setVisible true               public static void main String   arg                      new Stopwatch   addWindowListener new WindowAdapter                               public void windowClosing WindowEvent e                                      System exit 0                                        millis s new millis             s run

User · Answer

There s no built in Stopwatch utility but as of JSR-310  Java 8 Time  you can do this simply   ZonedDateTime now   ZonedDateTime now       Do stuff long seconds   now until ZonedDateTime now    ChronoUnit SECONDS     I haven t benchmarked this properly but I would guess using Guava s Stopwatch is more effective

User · Answer

You can find a convenient one here    https   github com varra4u utils4j blob master src main java com varra util StopWatch java  Usage    final StopWatch timer   new StopWatch    System out println  Timer      timer   System out println  ElapsedTime      timer getElapsedTime

[java] Is there a stopwatch in Java?

Examples related to java

Examples related to stopwatch