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1. Write in front As an active developer in Beijing, Tianjin and Hebei, we should take a look at some data of Shijiazhuang, an international metropolis. This blog crawls the rental information of Chain Home. The data can be used as data analysis material in the following blog. The website we need to c ...

I've been studying Java annotations and Java 8's new lambda expressions in the last few days, but it's still hot, haha. Recommendation 88: Implementing factory method patterns with enumeration is more concise The factory method pattern is "creating an object's interface, letting subclasses decide which class to instantiate, and delaying ...

Foreword: The meaning of Annotation in Chinese. Java annotations are used to provide metadata for Java code. Metadata refers to the data used to describe data, which, in general, describes the relationship between codes or the internal relationship between codes and other resources (such as database tables). In some technical frameworks, such ...

It always feels like UI updates in android are confusing! To sum up for yourself, it's like throwing a brick to attract jade. Before reading this article, suppose you understand threads and the use of Handler. At the end of the article, a sketch is appended to illustrate the relationship between Ha ...

Java 8-Stream Collection Operations Quick Start   Catalog Brief Introduction to Stream Why use Stream Instance data source Filter Map FlatMap Reduce Collect Optional Concurrent debugging Brief Introduction to Stream Java 8 introduced a new Stream API. Stream here is different from I/O streams. It is more like a colle ...

1. Introduction of argparse module argparse is a python standard library used to process command line parameters. In most cases, scripts may need multiple parameters, and each parameter type has different uses. It is very useful to add labels before parameters to indicate the type and use of paramete ...

Anonymous function Anonymous Function in computer programming refers to a class of functions that need not be defined. identifier (function name) function or subroutine It exists in many programming languages. wikipedia Golang supports anonymous functions, that is, when a function is needed, it is redefined. Anonymous functions have no functio ...

First missing integer 1. Topics Given an array A[0... N-1], find the first positive integer that is not in the array from 1. Given 3, 5, 1, 2, -3, 7, 14, 8, output 4. 2. Analysis There are two ways of thinking on this topic. The first idea is based on bitmap idea. It opens up a new array B[0.N-1]. All elements of the array are initialized to 0 ...

Original Link: http://www.cnblogs.com/fengty90/p/3768831.html Non-recursive traversal of binary trees Recently, I read about six ways to write binary tree traversal. Previously, I only wrote it recursively. This time, I will try writing ...

Original Link: http://www.cnblogs.com/fengty90/p/3768852.html 1. Dijkstra algorithm Finding the shortest path from one vertex to all other vertices is an algorithm that generates the shortest path in increasing order of path length. Al ...