Simple course design assignment -- personal address book database system (java, MySQL)

Summary: the main purpose of this personal address book database system is to make a complete and easy-to-use information management system to improve the efficiency of saving contacts. Due to the limited ability, the interface is not good-looking. In addition, the login programming only sets the login ...

Posted on Sat, 22 Feb 2020 06:56:50 -0800 by konetch

"Sword finger Offer" Java brush question NO.12 adjust array order to make odd number before even number

NO.11: adjust the array order so that the odd number is before the even number Portal: General Catalogue of sword finger Offer Time: February 18, 2020Title: Input an integer array, and implement a function to adjust the order of the numbers in the array, so that all the odd numbers are in the first ...

Posted on Sat, 22 Feb 2020 03:39:26 -0800 by RobNewYork

Collection, List and ArrayList source code

Collection, List and ArrayList source code 1. set 1.1 iterator Get the corresponding iterator < E > iterator through the collection object Iterator<E> iterator(); Common methods: boolean hasNext(); Determine whether the current Iterator can continue to run. E next(); Gets the cu ...

Posted on Sat, 22 Feb 2020 03:19:33 -0800 by ludjer

quartz integrates spring boot to realize CRUD details operation of dynamic configuration task

quartz integrates spring boot to realize CRUD details operation of dynamic configuration task Article directory quartz integrates spring boot to realize CRUD details operation of dynamic configuration task 1, Introduction to quartz Quartz API 2, quartz integrates spring boot to realize CRUD of dyna ...

Posted on Sat, 22 Feb 2020 01:08:44 -0800 by ajcether

size() method of ConcurrentHashMap (1.7 and 1.8)

In versions 1.7 and 1.8, the calculation size() method is written differently. The implementation of version 1.7 is introduced first. 1.7 version In version 1.7, there is an important class Segment, which is used to implement segmented lock static final class Segment<K,V> extends ReentrantLock implements Serializable { private s ...

Posted on Sat, 22 Feb 2020 01:07:10 -0800 by wenquxing

A simple web server software based on java

1. Write in front It has been more than a year and a half since the university came into contact with various web server software for more than a year. From the beginning of the freshman year, I began to toss about IIS brought by Windows computer, started my first static website, and since then started my interest in learning in the direction o ...

Posted on Fri, 21 Feb 2020 21:49:39 -0800 by taboo

2020.2.21 buffer flow, conversion flow

Buffer flow FileInputStream, fileoutputstream, FileReader and filewriter are the io operations between the computer and the hard disk. The read-write based on the hard disk is relatively slow. The speed of this operation is restricted by the read-write speed of the hard disk. In order to improve the r ...

Posted on Fri, 21 Feb 2020 04:27:37 -0800 by jokerbla

The java client of ElasticSearch and SpringDataElasticSearch

Article directory ElasticSearch Chapter 1 1, How to use java client 2, Index library management 1. Create index library 1) , create Client object 2) , using the method of client object to create index library 2. Set mapping information 1) Setting the mappings information when creating an index l ...

Posted on Fri, 21 Feb 2020 01:08:30 -0800 by natepizzle

Working at home, re recognizing Class and re reading java programming ideas

I have been learning java for some time. When I think of learning java before, I am afraid to see such symbols as class <? > and I don't understand their meaning. I reread Chapter 14 of Java programming ideas, and I will take advantage of this time to sort them out and face the fear at that time.                                 ...

Posted on Thu, 20 Feb 2020 23:28:22 -0800 by apacheguy

Spark command details

In this blog post, Alice gives you more details about Spark commands. spark-shell Introduce Previously, we used spark-shell to submit tasks. spark-shell is the interactive Shell program that comes with Spark, which makes it easy for users to program interactively. Users can write spark programs with ...

Posted on Thu, 20 Feb 2020 17:41:05 -0800 by Cut