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This article mainly explains "what are the advantages and disadvantages of the java Richter replacement principle". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what are the advantages and disadvantages of the java Richter replacement principle?"

Richter substitution principle (LSP), The Liskov Substitution Principle

Define

All references to the base class must be able to transparently refer to the objects of its subclass, that is, the subclass can extend the functionality of the parent class, but cannot modify the existing functionality of the parent class.

In other words, a subclass can also appear where the parent class appears, and replacing it with a subclass will not report an error, and the referrer does not need to know whether the reference is a parent class or a subclass, but the reverse will not work. Where the subclass appears, the parent class may not be able to appear and replace the subclass.

The characteristics of the Richter scale substitution principle:

1. The subclass can expand the function of the parent class, but cannot modify the existing function of the parent class. If you modify the existing function of the parent class, the function defined by the parent class may not be applicable after the subclass is overridden.

2. When overloading the methods of the parent class, the method parameters of the subclass should be more relaxed than that of the parent class.

3. When implementing abstract methods of the parent class, the method output of the subclass should be more stringent than that of the parent class.

4. Subclasses can have their own unique private methods, but it should be noted that if subclasses cannot fully implement the methods of the parent class, or if some methods of the parent class are no longer applicable in the subclass, it is recommended to break the parent-child relationship and use combinations instead of inheritance.

Advantages and disadvantages of the Richter scale substitution principle:

1. The reasonable use of the inheritance relationship of the class not only improves the reusability of the code, but also enhances the coupling between classes.

2. Through the establishment of abstraction, the concrete implementation replaces the abstraction in the running process, which ensures the extensibility of the system.

3. As long as the parent class is inherited, it has all the properties and methods of the parent class, which reduces the repeated creation of the code, shares the code, but also restricts the behavior of the subclass, and reduces the flexibility of the system.

In our usual development, we may not consider so much, the method of indiscriminately overwriting the parent class, inheritance with few connections, and so on, many break the principle of Richter scale substitution, so the reckless consequence is that there are potential loopholes in the programs we write, and the probability of problems will be significantly increased.

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