The relationship between bean and reflection in spring

Object generation of bean in spring

@Component
public TestBean {
    @Autowired
    PowerManager powerManager;
    public getPowerManager() {
        return powerManager;
    }
}

According to the class given above, the object is generated in the following way
1, through dependency injection

@Autowired
TestBean testBean；
这个时候生成的 对象， powerManager 属性时不为空的

2. new generates new objects

TestBean testBean = new TestBean();
这个种方式生成的对象， powerManager 属性是空， 因为这对象， 并不是通过spring的方式生成， 所以spring也不会把对应的属性注入