Exception in thread "main" java.lang.Nul?报错-问答-阿里云开发者社区-阿里云

Exception in thread "main" java.lang.NullPointerException
at com.javaeasy.logcarinterface.TrafficRecoderForLog.recordTransport(TrafficRecoderForLog.java:12)
at com.javaeasy.logcarinterface.test.main(test.java:11)

package com.javaeasy.logcarinterface;
import com.javaeasy.transport.Bus;
import com.javaeasy.transport.CarBase;
import com.javaeasy.transport.Bike;


public class test {
	public static void main(String[] args){
	CarBase base=new CarBase(40,"广汽本田","黑色");
	Bus bus=new Bus(30,"一汽迈腾","白色");
	TrafficRecoderForLog.recordTransport(base);
	TrafficRecoderForLog.recordTransport(bus);
	Bike bike=new Bike(10,"Memorid");
	TrafficRecoderForLog.recordTransport(bike);
}
}