How to make java delay for a few seconds

Question

Hey all I have this code  I want to delay my program for a few seconds and display  scanning       Here s what I have  This compiles but doesn t delay anything   if  i  1            try               Thread sleep 1             catch  InterruptedException ie                        System out println  Scanning                          thanks in advance I have int i   1 before obviously

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new Timer   schedule new TimerTask                      Override                 public void run                         if  getActivity      null                          getActivity   runOnUiThread    - gt  tvCovidAlert startAnimation animBounce                                     DELAY TIME MILI SECONDS

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You need to use the Thread sleep   method   This is used to pause the execution of current thread for specified time in milliseconds  The argument value for milliseconds can   t be negative  else it throws IllegalArgumentException   FYI  Summary taken from here   Java Thread Sleep important points   It always pause the current thread execution  Thread sleep doesn   t lose any monitors or locks current thread has acquired  Any other thread can interrupt the current thread in sleep  in that case InterruptedException is thrown

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Use Thread sleep 2000     2000 for 2 seconds

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waiting for some like 10  seconds your compiler to use this static class method TimeUnit SECONDS sleep 10    it s including in  java util concurrent TimeUnit libery

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This is in a mouseEvent btw    If this is in a Swing GUI  then get rid of all calls to Thread sleep      as doing so can put the entire GUI to sleep rendering it useless  Instead use a Swing Timer to produce any delays in the GUI while letting it still update its graphics   You ll also want to avoid System out println      calls  except when debugging  and instead display user notifications in the GUI itself  perhaps in a status JLabel or as a message dialog

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move the System out statement to finally block

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Thread sleep   takes in the number of milliseconds to sleep  not seconds   Sleeping for one millisecond is not noticeable  Try Thread sleep 1000  to sleep for one second

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Java   For calculating times we use this method   import java text SimpleDateFormat  import java util Calendar        public static String getCurrentTime         Calendar cal   Calendar getInstance        SimpleDateFormat sdf   new SimpleDateFormat  HH mm ss        return sdf format cal getTime         Second    import java util concurrent TimeUnit   System out println  Start delay of 10 seconds  Time is      getCurrentTime     TimeUnit SECONDS sleep 10   System out println  And delay of 10 seconds  Time is      getCurrentTime       Output      Start delay of 10 seconds  Time is  14 19 08       And delay of 10 seconds  Time is  14 19 18   Minutes   import java util concurrent TimeUnit   System out println  Start delay of 1 Minute  Time is      getCurrentTime     TimeUnit MINUTES sleep 1   System out println  And delay of 1 Minute  Time is      getCurrentTime       Output      Start delay of 1 Minute  Time is  14 21 20      And delay of 1 Minute  Time is  14 22 20   Milliseconds   import java util concurrent TimeUnit   System out println  Start delay of 2000 milliseconds  Time is     getCurrentTime     TimeUnit MILLISECONDS sleep 2000   System out println  And delay of 2000 milliseconds  Time is      getCurrentTime       Output      Start delay of 2000 milliseconds  Time is  14 23 44      And delay of 2000 milliseconds  Time is  14 23 46   Or   Thread sleep 1000     milliseconds

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As per java documentation definition of Thread sleep is     Thread sleep t   where t   gt  time in millisecons to sleep   If you want to sleep for 1 second you should have    Thread sleep 1000

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A couple problems  you aren t delaying by much   sleep is milliseconds  not seconds   and you re attempting to print in your catch statement  Your code should look more like   if  i  1        try           System out println  Scanning               Thread sleep 1000      1 second       catch  InterruptedException ex               handle error

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If you want to pause then use java util concurrent TimeUnit   TimeUnit SECONDS sleep 1     To sleep for one second or for 10 minutes  TimeUnit MINUTES sleep 10     Or Thread Sleep  try               Thread sleep 1000      catch InterruptedException ex         Thread currentThread   interrupt        see also the official documentation  TimeUnit SECONDS sleep   will call Thread sleep  The only difference is readability and using TimeUnit is probably easier to understand for non obvious durations   but if you want to solve your issue          int timeToWait   10    second         System out print  Scanning           try               for  int i 0  i lt timeToWait   i                      Thread sleep 1000                   System out print                              catch  InterruptedException ie                        Thread currentThread   interrupt

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You have System out println  Scanning      in a catch block   Do you want to put that in try

[java] How to make java delay for a few seconds?

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