class?Person?{
????private?Car?car;
????public?Person(Car?car){
????????this.car=car;
????}
????public?void?goHome(){
????????car.start();
????????car.drive();
????????car.stop();
????}
}

class?Car{
?????public?Car(){}
?????public?void?start(){}
?????public?void?drive(){}
?????public?void?stop(){}
}

class?IoCContainer{
????private?Map<String,Object>?beans=new?ConcurrentHashMap<>();

????public?Object?getBean(String?beanID){
????????return?beans.get(beanID);
????}

????public?void?setBean(Class<?>?clazz,String?beanID,String...?paramBeanIDs){
????????//1.組裝構造方法需要的參數值
????????Object[]?paramValues=new?Object[paramBeanIDs.length];
????????for(int?i=0;i<paramValues.length;i++){
????????????paramValues[i]=beans.get(paramBeanIDs);
????????}
????????//2.調用構造方法實例化bean
????????Object?bean=null;
????????for(Constructor<?>?constructor:clazz.getConstructors()){
????????????try?{
????????????????bean=constructor.newInstance(paramValues);
????????????}?catch?(InstantiationException?e)?{
????????????}?catch?(IllegalAccessException?e)?{
????????????}?catch?(InvocationTargetException?e)?{
????????????}
????????}
????????if(bean==null){
????????????throw?new?RuntimeException("找不到bean");
????????}
????????//3.將實例化的bean放入beans
???????beans.put(beanID,bean);
????}
}


public?class?Test2{
????private?IoCContainer?container=new?IoCContainer();

????@Before
????public?void?before(){
????????container.setBean(Car.class,"car");
????????container.setBean(Person.class,"person","car");
????}

????@Test
????public?void?test(){
????????Person?zhangSan=(Person)?container.getBean("person");
????????zhangSan.goHome();
????}

}