Shulou(Shulou.com)06/02 Report--

This article mainly explains "the implementation principle of IOC container in java". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "the implementation principle of IOC container in java".

Attribute injection

Constructor injection

Interface injection

The above code basically implements the function of the IOC container in our previous article, but when instantiating an object with Java reflection technology, if the method is private, that is, private, then there will be problems when we call it in the above way. Please see the test case below.

We have set the method of setUserDetailAble to be private. Then we directly execute the test case injected by the previous interface that has been passed. Take a look at the implementation results.

We see that although our test case has not changed anything, the above results are still abnormal. Why is that? This is because if you want to access a method or field of type private when using Java reflection, you must cancel the syntax checking of the Java language. That is, to add additional code, you can still call private methods and properties, which is different from our normal development, because the Java language stipulates that private methods can only be called in this class, but this restriction can be broken by using reflection technology in Java. Let's see how to call private methods.

At this point, I believe you have a deeper understanding of "the implementation principle of IOC container in java". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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