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From: https://mp.weixin.qq.com/s/7HebsMsH21LuDWPbHg6UBw Lombok is a magical java class library. It can automatically generate annotations to annoy annoying Getter s and Setter s in java beans. It can also automatically generate logger, ToString, HashCode, Builder and other java features or functions ...

1.1 Numpy Infrastructure NumPy array is a multidimensional array object called ndarray. It consists of two parts: (1) Actual data (2) Metadata describing these data # Multidimensional array ndarray import numpy as np ar = np.array([1,2,3,4,5,6,7]) print(ar) # Output arrays, note the format ...

1. The Concept and Function of Iterator The main purpose of iterator is to provide a unified and convenient access and traversal mechanism for collections in JS such as Array, Map, Set or some custom collections. It is actually an interface. Any data structure can be traversed by deploying the itera ...

abstract class Why define abstract methods: If you cannot define a method in terms of its specific implementation details; for example, when you define the eat method of the Person class, you cannot determine its specific implementation details, because Chinese, Western and South Asian people eat differently.This method can be defined as an abs ...

Concurrent HashMap in Java 7 Concurrency Level: Parallel level, concurrency number, Segment number, default is 16, that is, Concurrent HashMap has 16 Segments, at this time, in theory can support up to 16 threads concurrently write, as long as their operations are distributed on different Segments. T ...

I. Components of subcategories As we have mentioned before, classes can be roughly divided into two areas, as shown in the following figure: Detailed division of each area can be divided into: class A: company_name = 'Education for Old Boys' # Static variables (static fields) __iphone = '1353333xxxx' # Private static variables (priv ...

Single responsibility Single function Single function is the most basic requirement of SRP, that is to say, the function and responsibility of your class should be single, so that cohesion is high. For example, the following parameter class is used to query website Buyer information, according to SRP, it should be placed in the query Field. @Da ...

React series React Simple Analog Grammar (I)Jsx, Composite Events and Refs (II) The complete code is available for viewing virtualdom-diff Rendering DOM Anyone who has experienced PHP template development or JQuery's baptism knows that the simplest and crudest way to render them is to rebuild DOM to replace old DOM, and the problem is obvious. ...

In the last post, we had a simple understanding and a general understanding of vue components.When we first learned about the project structure, we created a folder for components in the / src directory, which is used today to place our custom components.   Making header.vue componentsIn the compone ...

Component Interaction Parent-child component interaction (common) Input, Output attributes One of the most basic scenarios is very precautionary. Using method, the data in the parent component is bound to the variables declared by the child component to ensure that the child component can be used for internal rendering template. The main concer ...