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1, Foreword Write in front: it took a day to sort out the data collected by small codewords. It's helpful for you. One key three times in a row. Ha, thank you!! HashMap is often encountered in our daily development. The source code and underlying principle of HashMap must be asked in the interview. Therefore, we should master it, which is ...

Binary tree is a common data structure in our daily learning. During the interview and study, we will inevitably encounter some algorithm problems related to binary tree. Today, I brought you some classic binary tree basic algorithm problems. Let's have a look! catalogue 1. Check whether the two trees are the same ① Title Description ② tr ...

Absrtact: starting from the handwriting thread pool, gradually analyze how these codes are implemented in the Java thread pool. This article is shared from Huawei cloud community< Handwritten thread pool, compare and learn the implementation principle of ThreadPoolExecutor thread pool! >, author: Xiao Fu Ge. Thanks for the plane, note ...

Generics play an important role in java, which can be seen in both open source framework and JDK source code. It is no exaggeration to say that generics are essential elements in general design, so it is a required course to truly understand and correctly use generics. 1: Generic essence Java generics is a new feature introduced in JDK ...

177. Convert the sorted array into a binary search tree with the lowest height Give a sort array (from small to large) and convert it into a binary search tree with the smallest height. class Solution: """ @param: A: an integer array @return: A tree node """ def sortedArrayToBST(self, A): # write your code her ...

Original author: https://zhuanlan.zhihu.com/p/364044293   From 0 to server development -- TinyWebServer preface: Project code for modification, complete annotation and addition of functions: https://github.com/white0dew/WebServer What is it—— C + + lightweight Web server under Linux helps beginners quickly practice network pr ...

Deep copy and shallow copy Shallow copy is to copy only the first layer of the object. If there is a variable type reference in the first layer, if the variable type changes, the copied object will also change. For example a = [1, 2, [1,2]] b = copy.copy(a) # Here, the final copy of both copy and list generated for loop slices is a sh ...

In the past few years, I have the luxury of working and mentoring with a considerable number of beginners. Although I have clearly witnessed a considerable part of my programming failure, things are not as black and white as they seem. Among beginners, I always see some patterns and behaviors. While some of these behaviors are misleading and ha ...

preface As the saying goes, "born of hardship, die of happiness", in fact, most middle-aged crises are produced in happiness. Some people may retort, "as you say, I still have to struggle. If I don't struggle, I will die. Isn't it wrong to choose a comfortable life? Don't I have the right to choose my own way of life?" Pe ...

catalogue After the execution of SQL statements in MyBatis, the processing of results     1. resultType result type refers to the java object that the data is converted to after the sql statement is executed. The java type is arbitrary     2. Alias the resultType of the returned result     3. Save q ...