Bukkit

public void someMethod() {
		SimpleWorldAPI api = new SimpleWorldAPI();
		
		//create a world
		api.createWorld("sample_end_world", api.getEnvironmentFromString("end"), true);
		api.createWorld("sample_nether_world", api.getEnvironmentFromString("nether"), true);
		
		//unload world
		api.unloadWorld("sample_nether_world");
		
		//load world
		api.loadWorld("sample_nether_world", api.getEnvironmentFromString("nether"));
		
		//teleport player "Xacero" to sample_end_world
		Player xacero = Bukkit.getServer().getPlayer("Xacero");
		api.teleportEntityToWorld(xacero, "sample_end_world");
		
		//retrieve world from memory
		World someworld = api.getWorldByName("sample_nether_world");
		
		//check if world is loaded
		if (api.isWorldLoaded("sample_nether_world")) {
			// do stuff
		}
		
		//check if world exists
		if (api.doesWorldExist("sample_nether_world")) {
			// do stuff
		}
		
		//get all worlds in memory
		List<World> worlds = api.getLoadedWorlds();
		
		//delete world
		api.deleteWorld("sample_nether_world");
		
	}