Programmer Think

1. Foreword There is a scenario where we need to read the attribute value from the configuration file and inject it into the java class. Should this class be new only once in the whole system! Think about what design patterns can be realized!! What is singleton mode Singleton mode: its essence is to control the number of instances. Mandarin ...

4.3.1 definition Command mode encapsulates a request as an object, so that you can parameterize customers with different requests, queue or log requests, and support revocable operations. The command mode belongs to the behavior mode of the object. Command mode abstracts an operation or behavior into an object, and separates the responsibility ...

The design principle is a summary of some experience guiding our code design, that is, "mental method"; Object oriented is our "weapon"; Design pattern is "move". Based on mental skill, use weapon moves to deal with complex programming problems. Why is McDonald's so popular? Cousin: brother, I want to eat McDonald ...

Appearance pattern is also called facade pattern: external communication with a subsystem must be carried out through a unified appearance object to provide a consistent interface for a group of interfaces in the subsystem. Appearance pattern defines a high-level interface, which makes the subsystem easier to use. Facade mode, also known as app ...

The design principle is a summary of some experience guiding our code design, that is, "mental method"; Object oriented is our "weapon"; Design pattern is "move". Based on mental skill, use weapon moves to deal with complex programming problems. Cousin: brother, I read the news today that the EU has expanded s ...

A lot of exception handling is involved in the process of business development. Usually @ ControllerAdvice and @ ExceptionHandler are used to handle various exceptions, but the process of throwing exceptions still can not avoid a lot of if Else judged that I happened to see an article today( Why not recommend using try catch to handle exception ...

Absrtact: Builder Pattern, also known as Builder Pattern, is an object construction pattern. It can abstract the construction process of complex objects (abstract categories), so that different implementation methods of this abstract process can construct objects with different representations (attributes). This article is shared from Huawei ...

"Crazy learning of Java design patterns: prototype patterns" Mode type The prototype pattern belongs to the creation pattern, which provides the best way to create objects. Two, schema definition Q: what is a prototype model? Answer: Prototype Pattern is to use prototype instances to specify the type of objects to be ...

Caller show - caller tagging The company's office app has its own address book. Sometimes when others call, the contact information of this contact is not saved in the mobile phone, and they are afraid of harassment after receiving the call. Therefore, I want to add an incoming call tag of our company, that is, the incoming call show function. ...

Solve some problems through certain skillscode: https://github.com/baixc1/csdn/tree/master/DesignPatterns/Skill Chain mode (OperateOfResponsibility) core Definition: returns the current object in the object method to realize the chain call to multiple methods of one objectKey points: simplify interface calls (return this)Application: jQu ...