Humen;

com.example.demo2.Car.Car;

ZhangSan?HumenWithCar{
????(Car?car){
????????(car);
????}

????(){
????????.start();
????????.turnLeft();
????????.turnRight();
????????.stop();
????}
}

Humen;

com.example.demo2.Car.Car;

LiSi?HumenWithCar{
????(Car?car){
????????(car);
????}

????(){
????????.start();
????????.turnRight();
????????.stop();
????}
}

com.example.demo2.Car;
java.lang.reflect.Constructor;
java.lang.reflect.InvocationTargetException;
java.util.Map;
java.util.concurrent.ConcurrentHashMap;

IoCContainer?{
????Map<String,?Object>?=?ConcurrentHashMap<String,?Object>();

????Object?(String?beanId)?{
????????.get(beanId);
????}

????(Class<?>?clazz,?String?beanId,?String?...paramBeanIds)?{
????????Object[]?paramValues?=?Object[paramBeanIds.];

????????(i?=?;?i?<?paramBeanIds.;?i++)?{
????????????paramValues[i]?=?.get(paramBeanIds[i]);
????????}
????????Object?bean?=?;
????????(Constructor<?>?constructor?:?clazz.getConstructors())?{
????????????{
????????????????bean?=?constructor.newInstance(paramValues);
????????????}?(InstantiationException?|?InvocationTargetException?|?IllegalAccessException?e)?{
????????????}
????????}
????????(bean==)?{
????????????RuntimeException();
????????}

????????.put(beanId,?bean);
????}
}

com.example.demo2;


Humen.LiSi;
Humen.ZhangSan;
Humen.humen;
com.example.demo2.Car.Audi;
com.example.demo2.Car.Buick;
com.example.demo2.Car.IoCContainer;
org.junit.;
org.junit.jupiter.api.;



Demo2ApplicationTests?{
????IoCContainer?=?IoCContainer();

????(){
????????.setBeans(Audi.,?);
????????.setBeans(Buick.,?);
????????.setBeans(ZhangSan.,?,);
????????.setBeans(LiSi.,?,);

????}
????()?{
?????????humen?zhangsan?=?(humen)?.getBean();
?????????zhangsan.hoHome();

????????humen?lisi?=?(humen)?.getBean();
????????lisi.hoHome();
????}

}

java.lang.NullPointerException: Cannot invoke "Humen.humen.hoHome()" because "zhangsan" is null