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Technical Articles

Java

javaTutorial

What is the var keyword in Java?

Yes,JavahasavarkeywordstartingfromJava10,whichenableslocalvariabletypeinference,allowingdeveloperstodeclarevariableswithoutexplicitlyspecifyingtheirtypeaslongastheyareinitialized,suchasvarage=25;wherethecompilerinfersthetypeatcompiletime,makingthecod

Sep 07, 2025 am 04:19 AM

How to use atomic variables in Java?

AtomicvariablesinJavaarepartofthejava.util.concurrent.atomicpackageandprovideawaytoperformthread-safeoperationsonvariableswithoutusingsynchronizedblocksorlocks.Theyareusefulinconcurrentprogrammingwheremultiplethreadsacce

Sep 07, 2025 am 04:16 AM

How to use JUnit for testing in Java

To use JUnit for Java testing, you must first add JUnit dependency in the project, add corresponding dependency in the Maven project to pom.xml, add testImplementation dependency in the Gradle project to build.gradle, and ensure that the test directory is src/test/java; 2. When writing the test class, create a test class corresponding to the tested class, use @Test annotation to mark the test method, verify the result through assertEquals and other assertions, and add failure prompt information; 3. Proficient in using JUnit5 common annotations such as @Test, @BeforeEach, @AfterEach, @B

Sep 07, 2025 am 04:14 AM

Netbox Database User Guide: PostgreSQL Connections and Transaction Operations

This article aims to help developers understand the types of databases used by Netbox and provide guidance on transactional operations through Java connection to PostgreSQL databases. We will introduce how to configure a Java environment, establish database connections, and how to use transactions to ensure data consistency to meet the needs of scenarios such as VM information management in Netbox.

Sep 07, 2025 am 03:54 AM

JavaFX GridPane dynamically add rows, columns and adaptive window size tutorial

This article aims to solve the problem of dynamically adding rows and columns in JavaFX GridPane and adjusting the size of GridPane and windows to suit the number of rows and columns. By setting percentage constraints, automatic adjustment of GridPane ranks and columns can be achieved, thereby adapting to windows of different sizes, and providing sample code to help developers quickly implement functions.

Sep 07, 2025 am 03:42 AM

Java implementation and mathematical analysis of summing infinite series

This article aims to explain in detail how to use Java to accurately calculate the sum of a specific form of infinite series S = -(2x)^2/2! (2x)^4/4! - (2x)^6/6! ... in a specified interval [0.1, 1.5]. We will analyze the mathematical properties of series in depth, derive its closed form, and correct errors in the original Java code based on this, providing an efficient and accurate iterative summation implementation, while exploring the potential differences with reference functions.

Sep 07, 2025 am 03:33 AM

How to get a substring from a string in Java

ToextractasubstringinJava,usethesubstring()methodwithvalidindices;1.substring(intbeginIndex)returnstheportionfrombeginIndextotheendofthestring;2.substring(intbeginIndex,intendIndex)returnsthesubstringfrombeginIndexupto,butnotincluding,endIndex;always

Sep 07, 2025 am 02:32 AM

How to create JSON from Java objects using Jackson

To convert Java objects to JSON using Jackson, you must use the ObjectMapper class. 1. Add Jackson dependency: Add Jackson-databind dependency in Maven, or add corresponding libraries in Gradle. 2. Create a Java class: Define a POJO that contains fields, constructors, getters and setters, such as the User class. 3. Create an ObjectMapper instance: Initialize the ObjectMapper object in the code. 4. Convert to JSON: Call writeValueAsString() method to serialize Java objects into JSON strings. 5. Optional formatting input

Sep 07, 2025 am 01:47 AM

How to use a for-each loop in Java

Thefor-eachloopinJavaisanenhancedforloopthatsimplifiesiterationoverarraysorcollections.1.Itusesthesyntax"for(typevariable:arrayOrCollection)"toaccesseachelementdirectly.2.Iteliminatesmanualindexmanagement,reducingerrorslikeout-of-boundsexce

Sep 07, 2025 am 01:35 AM

java

What is the difference between a JAR and a WAR file in Java?

AJARfileisusedforgeneral-purposeJavapackagingsuchaslibrariesorstandaloneapplications,whileaWARfileisspecificallydesignedforwebapplicationsdeployedonaservletcontainer;JARfileshaveaflexiblestructureandcanbeexecuteddirectlyiftheycontainamainclass,wherea

Sep 07, 2025 am 01:20 AM

java JAR WAR

How to find an element in an ArrayList in Java

To find elements in ArrayList, choose different methods according to your needs: 1. Use contains() to check whether the element exists, return true or false; 2. Use indexOf() to get the index of the first occurrence of the element, return -1, or use lastIndexOf() to get the index of the last occurrence of the element; 3. For conditional searches, you can use the for-each loop or Java8's StreamAPI, such as filter().findFirst() to find the first match, or collect() to collect all elements that meet the conditions; 4. For custom objects such as Person class, equals() and hashCo need to be rewrite

Sep 07, 2025 am 12:42 AM

Understanding the Java Memory Model for Concurrent Programming

TheJavaMemoryModel(JMM)definesrulesformemoryvisibilityandorderinginmultithreadedprograms.2.Thehappens-beforerelationshipensuresthatactionsinonethreadarevisibletoanother,establishedthroughprogramorder,lockacquisition/release,volatilevariables,threadst

Sep 07, 2025 am 12:20 AM

Android Tutorial: Handling the Passing of Toast and Context in Universal Tool Class

This article aims to solve the Context delivery problem encountered when calling Toast messages in non-Activity classes (such as project management classes) in Android development. By elaborating on the importance of Context in UI operations in detail and providing a solution to receive Context parameters using static methods, we ensure that developers can efficiently and safely reuse Toast functions in any activity and avoid duplicate code.

Sep 06, 2025 am 11:42 AM

Elasticsearch exists Query Field Name Case Sensitivity Processing Guide

When checking whether a field exists, the field name is strictly case sensitive. At present, there is no built-in mechanism that can directly implement ignoring case query of field names. This means that "color" and "COLOR" will be treated as two different fields. The core of solving this problem lies in the standardization of field naming during the data model design phase, or preprocessing of field names at the application layer.

Sep 06, 2025 am 11:36 AM