GWT中的Java Timer

Question

I'm trying to have a Java Timer in my EntryPoint:

Timer timer = new Timer();
timer.schedule(
   new TimerTask() {
       public void run() {
           //some code
       }
   }
   , 5000);

But when trying to compile this I got: No source code is available for type java.util.Timer ; did you forget to inherit a required module?

What can I do to fix this error?

Answer 1

In GWT you are restricted to use all the Util package classes.

Here is the List of Classes only you can use from util class.

You can use GWT Timer class .

Example( from docs );

 public void onClick(ClickEvent event) {
    // Create a new timer that calls Window.alert().
    Timer t = new Timer() {   //import (com.google.gwt.user.client.Timer)
      @Override
      public void run() {
        Window.alert("Nifty, eh?");
      }
    };

    // Schedule the timer to run once in 5 seconds.
    t.schedule(5000);
  }

Answer 2

If you're using Libgdx, you can use the libgdx Timer infrastructure to schedule work to run in the future:

Timer t = new Timer();
t.scheduleTask(new Timer.Task() { 
      public void run() { /* some code */ } 
  }), /* Note that libgdx uses float seconds, not integer milliseconds: */ 5);

This way you can schedule the timer in your platform independent code. (The GWT-specific solution will only work in the platform dependent part of your project.)