[Bukkit] DefWorld: get DefaultWorld

DefWorld.java

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.bukkit.Bukkit;
import org.bukkit.World;
import org.bukkit.plugin.java.JavaPlugin;

public class DefWorld {

	public static World defworld = null;
	
	public static void defaultWorld(JavaPlugin plugin){
		try {
			Properties configuration = new Properties();
			String AbsolutePath = plugin.getDataFolder().getAbsolutePath();
			String parentPath = plugin.getDataFolder().toString();
			String filePath = AbsolutePath.replace(parentPath, "server.properties");
			File file = new File(filePath);
			InputStream inputStream = new FileInputStream(file);
			configuration.load(inputStream);
			
			String level = configuration.getProperty("level-name");
			World w = Bukkit.getWorld(level);
			if(w != null) {
				defworld = w;
				return;
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		World w = Bukkit.getWorlds().get(0);
		defworld = w;
		return;
	}
}

Sample1.java

import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin{

	public void onEnable(){
		//get&set DefaultWorld
		DefWorld.defaultWorld(this);
	}
	public void onDisable() {
	}
}