List operations in Python

Python's list manipulation is powerful and convenient (as opposed to Java)Say nothing about simple, regular operations (this is not an introductory tutorial) and introduce a few very specific examplesAdd to # Append to End(append) li = [1, 2, 3, 4, 5] li.append(6) print('li = %s' % li) # Output: li = [1, 2, 3, 4, 5, 6] # Append a list ...

Posted by mdnghtblue on Sun, 12 Jul 2020 16:48:39 +0200

Coexistence of Kotlin and Java, calling kotlin code in -Java

Call of kotlin data class Call of object simple profit mode class in Kotlin Calling file class in Kotlin Flexible transfer of parameters by calling jvm annotation String string null call Call of kotlin data class kotlin Code: package com.tianfu.kotlin /** * age Member annotations cannot have get and ...

Posted by imranlink on Wed, 08 Jul 2020 18:01:49 +0200

Java Exercise--Generics (12)

1. Write a Book class that has at least two properties, name and price.This class implements the Comparable interface by specifying that the size relationship between two Book class instances is the size relationship of the price attribute of the two Book class instances in the compareTo() method of the interface.In the main function, select t ...

Posted by arjay_comsci on Mon, 06 Jul 2020 16:49:39 +0200

Principle and java implementation of inserting red and black trees

A red-black tree is a binary balanced lookup tree in which each node has a storage bit to represent the color of the node, either RED or BLACK.Red-black trees have the following properties: (1) Each node is red or black (2) The root node is black (3) If a node is red, both of its sons are black (4) For each node, all paths from that node to its ...

Posted by alin19 on Sun, 05 Jul 2020 16:54:33 +0200

Gui-2

Write a JFrame window, the requirements are as follows: 1. Place a JPanel panel in the NORTH area of the window. 2. JPanel panel places the following components: (1) JLable label, the label text is "interest", then on the right are three JCheckBox multi-choice buttons, the options are "badminton", "table tennis" ...

Posted by depojones on Sat, 04 Jul 2020 17:59:22 +0200

Java Thread State

This article is as follows: I. Several States and descriptions of Java threads 2. Sample Procedures 1. Status of Java Threads The state of the Java thread can beJava.lang.ThreadObtained in.State, there are six states identified: (1) NEW: Create a new thread, not yet started (2) RUNNABLE: thread executing after ca ...

Posted by tinuviel on Thu, 02 Jul 2020 18:29:14 +0200

Pure html cross-domain access to java interfaces

What is cross-domain? Cross-domain means that html access addresses and interface addresses are in different domains. As long as one of the domain names, protocols, and ports is satisfied, cross-domain means cross-domain. Why not cross-domain? Because of security issues, such as when a user visits a bank website, ...

Posted by phpvolution on Thu, 02 Jul 2020 16:33:10 +0200

Separation of dynamic and static state by Nginx+Tomcat

Add group groupadd www Add user WWW: useradd - G www under www group Modify configuration file nginx.conf : user www www; worker_processes 2; events{ worker_connections 1024; } http{ #Set the default type to binary stream default_type application/octet-stream; server_names_hash_bucket_size 128; #Specify the hea ...

Posted by dheeraj4uuu on Wed, 01 Jul 2020 16:58:12 +0200

NDK development series one -- image brightness and saturation processing

github code gate: https://github.com/18380438200/NdkUse First, the effect picture: Preview The implementation method of java is as follows: public class JavaFilter { public static final float brightness = 0.2f; //brightness public static final float contrainst = 0.2f; //Contrast, color deepening public static Bitmap getImag ...

Posted by gerrydewar on Tue, 30 Jun 2020 18:28:03 +0200

Hadoop source code compilation

No one has to help you. Everything has to be done by yourself Hadoop source code compilation preparation (1) CentOS networking Configure CentOS to connect to the Internet. Linux virtual machine ping is smooth Note: use root role compilation to reduce the folder permissions (2) jar package preparation (hadoop source code, JDK8, maven, ant, p ...

Posted by henryblake1979 on Tue, 30 Jun 2020 10:51:58 +0200