import com.badlogic.gdx.ai.msg.Telegraph; //导入依赖的package包/类
public AssetStateIdle() {
    MessageManager.getInstance().addListener(new Telegraph() {
        @Override
        public boolean handleMessage(Telegram msg) {
            startGcTask();
            return true;
        }
    }, AssetsStates.ASSETS_GC);
}
 

import com.badlogic.gdx.ai.msg.Telegraph; //导入依赖的package包/类
@Override
public Object provideMessageInfo (int msg, Telegraph receiver) {
	// when a new citizen come to town we tell him that we exists
	return this;
}