Calling tasks via libraries/other plugins.

Out of curiosity I was wondering if bukkit tasks could be called out of an API, because obviously without the help of another plugin you can't call events. So I had assumed the same applied to tasks. If they can't one could still go about calling tasks in a different plugins source, correct? Like this for example:

Code:

public class ExampleClass {
   
    private int number = 0;
    private Plugin plugin;
   
    public ExampleClass(int i, Plugin plugin){
        this.number = i;
        this.plugin = plugin;
    }
   
    public void addOne(){
        final ExampleClass exm = this;
        plugin.getServer().getScheduler().scheduleSyncDelayedTask(plugin, new Runnable() {
                @Override
                public void run() {
                    exm.number++;
                }
            }, 20L);     
    }
}

In this case ExampleClass would be a object used in a said API. Could a different plugin still run this as long as you registered that the plugin originally containing ExampleClass?

Thanks,
-Warreo