Programming VIP

This article comes from Introduction to Java video tutorial Courseware. Factory mode It realizes the separation of creator and caller, that is, the specific process of creating objects is shielded and isolated, so as to improve flexibility. In fact, both design patterns and object-oriented design principles are to make the development proj ...

1, List interface 1. General Inherits the Collection interface, which is a Collection of elements For example, the order of storing elements is 11, 22, 33. Then, the storage of elements in the set is completed in the order of 11, 22 and 33) It is a set with index ， through which the elements in the set can be operated accurately (the ...

1, Abstract class 1. Overview of abstract classes (understanding) When we are doing subclass common function extraction, some methods are not embodied in the parent class. At this time, we need to abstract classes! In Java, a method without a method body should be defined as an abstract method, and if there is an abstract method in a c ...

Go function, array, pointer, structure, slice 10, Functions 1. Format: func Function name(parameter list) return type{ } When there are multiple return values: func Function name(parameter list) (Return value 1 type,Return value 2 type,Return value 3 type){ } 2. Function parameters (1) Value passing; Go language uses value passing by def ...

List derivation and dictionary derivationDerivation is a very Python knowledge in Python. This blog will give you detailed answers to the technical knowledge related to list derivation and dictionary derivation.List derivationList derivation can quickly generate a specific list by using data types such as list, tuple, dictionary and collection. ...

1, Overview of method recursion 1. What is method recursion The form in which a method calls itself directly or indirectly is called method recursion. As an algorithm, recursion is widely used in programming languages. 2. Recursive form Direct recursion: the method calls itself. Indirect recursion: the method calls other methods, and othe ...

1. Preface Have you ever wondered if the ++ operation in Java is thread-safe, that is, if multiple threads execute the ++ operation together in a multi-threaded situation, the result will not be what we expected. You can write a demo to verify it. public static int count = 0; public static void main(String[] args) { for (int j = 0; j < ...

Overview of built-in functions There are 80 built-in functions in Python 2.7. Skillfully remembering and using these built-in functions will greatly improve the speed of writing Python code and the elegance of the code. The following code example uses ipython, a much better interpreter than the official interpreter, to learn and use values. ...

Get stock data through Python API Poly width Code example Get the stock information of Ping An Bank from jqdatasdk import * auth('','') #Obtain the data of Ping An Bank in the first four time units based on "2015-01-30 14:00:00" in a 1-minute cycle df = get_price('000001.XSHE', end_date='2015-01-30 14:00:00',count=4, frequenc ...

Be careful! If you choose a non-default engine, you need to set up a template engine in AutoGenerator. AutoGenerator generator = new AutoGenerator(); // set freemarker engine generator.setTemplateEngine(new FreemarkerTemplateEngine()); // set beetl engine generator.setTemplateEngine(new BeetlTemplateEngine()); // set custom engine ...