How to call function every hour? Also, how can I loop this?

问题

I need a simple way to call a function every 60 minutes. How can I do this? I'm making a MineCraft bukkit plugin, and this is what I have:

package com.webs.playsoulcraft.plazmotech.java.MineRegen;

import java.util.logging.Logger;

import org.bukkit.Location;
import org.bukkit.block.Block;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.plugin.java.JavaPlugin;


public class Main extends JavaPlugin{

    public final Logger log = Logger.getLogger("Minecraft");


    @Override
    public void onEnable() {
        this.log.info("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
        this.log.info("Plaz's Mine Regen is now enabled!");
        this.log.info("Copyright 2012 Plazmotech Co. All rights reserved.");
        this.log.info("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
    }

    @Override 
    public void onDisable() {
        this.log.info("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
        this.log.info("Plaz's Mine Regen is now disabled!");
        this.log.info("Copyright 2012 Plazmotech Co. All rights reserved.");
        this.log.info("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
    }

    public void onPlayerInteract(PlayerInteractEvent event) {
        final Action action = event.getAction();
        if (action == Action.LEFT_CLICK_BLOCK) {
            Location l1 = event.getClickedBlock().getLocation();
        } else if (action == Action.RIGHT_CLICK_BLOCK) {
            Location l2 = event.getClickedBlock().getLocation();
        }
    }
}

I need to run a function I will implement every hour, how? Remember: The function will use l1, and l2. Also, how can I loop this to get every block inbetween?

回答1:

Create a Timer object and give it a TimerTask that performs the code you'd like to perform.

Timer timer = new Timer ();
TimerTask hourlyTask = new TimerTask () {
    @Override
    public void run () {
        // your code here...
    }
};

// schedule the task to run starting now and then every hour...
timer.schedule (hourlyTask, 0l, 1000*60*60);

If you declare hourlyTask within your onPlayerInteract function, then you can access l1 and l2. To make that compile, you will need to mark both of them as final.

The advantage of using a Timer object is that it can handle multiple TimerTask objects, each with their own timing, delay, etc. You can also start and stop the timers as long as you hold on to the Timer object by declaring it as a class variable or something.

I don't know how to get every block in between.

回答2:

Create a thread that will run forever and wakes up every hour to execute your data.

Thread t = new Thread() {
    @Override
    public void run() {
        while(true) {
            try {
                Thread.sleep(1000*60*60);
                //your code here...
            } catch (InterruptedException ie) {
            }
        }
    }
};
t.start();

回答3:

You must use Bukkit Scheduler:

public void Method(){
    this.getServer().getScheduler().scheduleSyncDelayedTask(this, new Runnable() {
        @Override
        public void run() {
            // Your code goes here
            Method();
        }
    }, time * 20L );
}

You must create a method with this and there you must call the same method.

回答4:

The simplest way (in my opinion) is use Thread (the above comment has mention about it).
You can also use Timer in javax.swing.Timer
But i think - as 101100 said - you can use TimerTask. You can check this link (from IBM)

来源：https://stackoverflow.com/questions/10748212/how-to-call-function-every-hour-also-how-can-i-loop-this

标签

java

timer

scheduled-tasks