Functional background: As business records gradually grow, duplicate project name data and duplicate content data gradually appear, which leads to a decline in the quality of project records. In order to avoid this situation from happening, we consider performing duplication checking on key data information. We originally planned to use a third-party standard duplication checking […]
Tag: java
JavaScript Library: jQuery, Simplified Programming
jQueryIntroduction Official website: https://jquery.com jQuery is a JavaScript Library . greatly simplified JavaScript Programming, for example JS Dozens of lines of native code to achieve the function able, jQuery It may be implemented in one or two lines, so it is widely used by front-end programmers. (Now in a relatively marginal state) Since its development, […]
Java–Date string usage
Operation string dates, etc. 1. String concatenation public class Test { public static void main1(String[] args) { String str1 = “hello,”; String str2 = “my name is Tom!”; String str3 = str1 + str2; System.out.println(str3); } //The running results are as follows: // hello, my name is Tom! public static void main2(String[] args) { System.out.println(10 […]
[javaScript Core] High-order functions
Foreword “In JavaScript, functions are first-class citizens.” We can always see this sentence in various books and articles. The popular explanation is: functions in JS are also objects. They can have attributes, can be assigned to a variable, can be placed in an array as elements, and can be used as attributes of other objects. […]
Java interface-oriented – rock paper scissors
Interface development process Define the interface. The interface defines the method name and does not need to be implemented. All developers must implement the interface for development. Inheritance is single inheritance, and cascading achieves multiple inheritance. Interface (which module to develop), multiple inheritance For methods that are not implemented, you only need to limit the […]
Hbase java api operation
1. Table exists package org.example; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.TableName; import org.apache.hadoop.hbase.client.Admin; import org.apache.hadoop.hbase.client.Connection; import org.apache.hadoop.hbase.client.ConnectionFactory; import java.io.IOException; public class TestDemo { public static Connection connection=null; public static Admin admin=null; static { try { Configuration configuration = HBaseConfiguration.create(); configuration.set(“hbase.rootdir”, “hdfs://192.168.170.80:8020/hbase”); configuration.set(“hbase.zookeeper.quorum”,”hadooplyf316″); connection= ConnectionFactory.createConnection(configuration); admin = connection.getAdmin(); } catch (IOException e) { e.printStackTrace(); } } […]
Java_Inheritance and Polymorphism
Article directory Preface inherit inheritance syntax Inheritance summary super specifies access to the parent Subclass constructor super and this Let’s talk about initialization (execution sequence) again protected keyword Inheritance method final keyword Inheritance and composition Polymorphism Dynamic binding and static binding Polymorphic implementation conditions rewrite Foreword Suitable for review Inheritance Inheritance syntax Modifier class subclass […]
Java parses OWL ontology for addition and deletion operations
First configure the path of the operation ontology (match your own path): //The name of the owl file changes as the owl file changes. String metaName = “newmeta_11.owl”; //The IRI of the owl file changes as the owl file changes. String ontologyIRI = “http://www.semanticweb.org/asus/ontologies/2022/6/untitled-ontology-23”; /** * Try to load the metadata file, try to find […]
Volatile: The hidden hero of Java concurrent programming
: Just work hard and leave the rest to time : Xiaopozhan Volatile: The invisible hero of Java concurrent programming Preface First: Visibility Issues Second: Prohibit instruction reordering Third: Happens-Before relationship Fourth: Application cases Fifth: Comparison of Volatile, synchronized, and Lock Volatile: synchronized: Lock: Choose the appropriate tool: Sixth: Common misunderstandings and precautions Common misunderstandings: […]
jsp+servlet campus forum campus bbs (administrator, user) based on javaweb+mysql (java+jsp+servlet+mysql)
jsp + servlet campus forum campus bbs (administrator, user) based on javaweb + mysql (java + jsp + servlet + mysql) Private message Source code acquisition and debugging communication Operating environment Java≥8, MySQL≥5.7, Tomcat≥8 development tools eclipse/idea/myeclipse/sts, etc. can be configured to run Be applicable Course design, major assignments, graduation projects, project exercises, learning demonstrations, […]