Main Class File:
package me.scherer.Zach;
import java.util.logging.Logger;

import org.bukkit.plugin.PluginManager;
import org.bukkit.plugin.java.JavaPlugin;

public class Zach extends JavaPlugin  {
	Logger log = Logger.getLogger("Minecraft");
}public void onEnable(){
	log.info("Your plugin has been enabled.");
	PluginManager pm = this.getServer().getPluginManager();}

	public void onDisable(){

		pm.registerEvent(Event.Type.PLAYER_MOVE, PlayerListener, Event.Priority.Normal, this);
		private final schererPlayerListener playerListener = new schererPlayerListener(this);


Block Listener class file:
package me.scherer.Zach;

import org.bukkit.event.block.BlockBreakEvent;
import org.bukkit.event.block.BlockListener;

public class ZachBlockListener {
}
public class ZachBlockListener extends BlockListener{ //Code here }
        public Zach plugin;

public void onBlockBreak(BlockBreakEvent event){
     Block block = event.getBlock();
     if(block.equals(Material.LEAVES){
          if(Math.random() * 100 <= 50){ // 50 percent chance of it happening
               ItemStack is= new ItemStack(Material.APPLE,2)
               block.getWorld().dropItemNaturally(block.getLocation, is);