Print hello world every X seconds

Question

Lately I ve been using loops with large numbers to print out Hello World   int counter   0   while true          loop for  5 seconds     for int i   0  i  lt  2147483647   i                another loop because it s 2012 and PCs have gotten considerably faster            for int j   0  j  lt  2147483647   j                     System out println counter      Hello World         counter        I understand that this is a very silly way to do it  but I ve never used any timer libraries in Java yet  How would one modify the above to print every say 3 seconds

User · Answer

This is the simple way to use thread in java   for int i   0  i lt  10  i          try             sending the actual Thread of execution to sleep X milliseconds         Thread sleep 3000         catch Exception e            System out println  Exception     e getMessage               System out println  Hello world

User · Answer

I figure it out with a timer  hope it helps  I have used a timer from java util Timer and TimerTask from the same package  See below   TimerTask task   new TimerTask           Override     public void run             System out println  Hello World              Timer timer   new Timer    timer schedule task  new Date    3000

User · Answer

Try doing this   Timer t   new Timer    t schedule new TimerTask          Override     public void run            System out println  Hello World             0  5000     This code will run print to console Hello World every 5000 milliseconds  5 seconds   For more info  read https   docs oracle com javase 1 5 0 docs api java util Timer html

User · Answer

You can also take a look at Timer and TimerTask classes which you can use to schedule your task to run every n seconds   You need a class that extends TimerTask and override the public void run   method  which will be executed everytime you pass an instance of that class to timer schedule   method    Here s an example  which prints Hello World every 5 seconds  -  class SayHello extends TimerTask       public void run            System out println  Hello World                  And From your main   method or any other method Timer timer   new Timer    timer schedule new SayHello    0  5000

User · Answer

What he said  You can handle the exceptions however you like  but      Thread sleep miliseconds    is the best route to take   public static void main String   args  throws InterruptedException

User · Answer

public class HelloWorld extends TimerTask       public void run              System out println  Hello World              public class PrintHelloWorld       public static void main String   args            Timer timer   new Timer            timer schedule new HelloWorld    0  5000            while  true                try                   Thread sleep 2000                 catch  InterruptedException e                    System out println  InterruptedException Exception    e getMessage                                       infinite loop is created ad scheduler task is configured

User · Answer

Add Thread sleep  try           Thread sleep 3000         catch InterruptedException ie

User · Answer

You can use Thread sleep 3000  inside for loop   Note  This will require a try catch block

User · Answer

Use java util Timer and Timer schedule TimerTask delay period  method will help you   public class RemindTask extends TimerTask       public void run           System out println   Hello World               public static void main String   args          Timer timer   new Timer           timer schedule new RemindTask    3000 3000

User · Answer

For small applications it is fine to use Timer and TimerTask as Rohit mentioned but in web applications I would use Quartz Scheduler to schedule jobs and to perform such periodic jobs   See tutorials for Quartz scheduling

User · Answer

Here s another simple way using Runnable interface in Thread Constructor  public class Demo       public static void main String   args            Thread t1   new Thread new Runnable                   Override             public void run                     for int i   0  i  lt  5  i                         try                           Thread sleep 3000                         catch  InterruptedException e                               TODO Auto-generated catch block                         e printStackTrace                                              System out println  Thread T1     i                                                        Thread t2   new Thread new Runnable                   Override             public void run                     for int i   0  i  lt  5  i                          try                           Thread sleep 3000                         catch  InterruptedException e                               TODO Auto-generated catch block                         e printStackTrace                                              System out println  Thread T2     i                                                        Thread t3   new Thread new Runnable                   Override             public void run                     for int i   0  i  lt  5  i                         try                           Thread sleep 3000                         catch  InterruptedException e                               TODO Auto-generated catch block                         e printStackTrace                                              System out println  Thread T3     i                                                        t1 start            t2 start            t3 start

User · Answer

public class TimeDelay    public static void main String args          try         while  true            System out println new String  Hello world             Thread sleep 3   1000      every 3 seconds               catch  InterruptedException e          e printStackTrace

User · Answer

The easiest way would be to set the main thread to sleep 3000 milliseconds  3 seconds    for int i   0  i lt  10  i          try             sending the actual Thread of execution to sleep X milliseconds         Thread sleep 3000         catch InterruptedException ie         System out println  Hello world         This will stop the thread at least X milliseconds  The thread could be sleeping more time  but that s up to the JVM  The only thing guaranteed is that the thread will sleep at least those milliseconds  Take a look at the Thread sleep doc      Causes the currently executing thread to sleep  temporarily cease execution  for the specified number of milliseconds  subject to the precision and accuracy of system timers and schedulers

User · Answer

If you want to do a periodic task  use a ScheduledExecutorService  Specifically ScheduledExecutorService scheduleAtFixedRate  The code   Runnable helloRunnable   new Runnable         public void run             System out println  Hello world              ScheduledExecutorService executor   Executors newScheduledThreadPool 1   executor scheduleAtFixedRate helloRunnable  0  3  TimeUnit SECONDS

[java] Print "hello world" every X seconds

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