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Technical Articles

Java

javaTutorial

Efficient comparison of collection elements in Java: Tutorial for finding missing items using Set

This tutorial is designed to solve the problem of comparing two collections (such as shopping lists vs inventory lists) in Java to determine if there are missing items. The article will analyze the limitations of traditional linear search methods and focus on how to optimize this process by leveraging the efficient search characteristics of Set data structures (average O(1) time complexity). With specific code examples, readers will learn how to correctly compare collection elements and effectively identify and report all missing items, thereby improving program performance and readability.

Aug 14, 2025 pm 06:24 PM

Guide to Solving SLF4J Provider-free Warnings in Spring Boot Integration Tests

This article aims to solve the problem that the "No providers were found" warning in the Gradle integrated test environment of Spring Boot applications, causing the log to be unable to output. By analyzing the binding mechanism and version compatibility of SLF4J, we found that this is usually caused by the mismatch or conflict between the SLF4J API and the log implementation binding version in the classpath. The article provides a specific Gradle dependency solution and discusses relevant considerations to ensure that the logging system works properly during different testing stages.

Aug 14, 2025 pm 06:21 PM

Spark: Remove columns from beans before partition writing

This document describes how to dynamically remove unwanted columns based on different partitioning policies when writing Bean objects to partitions using Spark. By using the select method before writing, you can flexibly select the columns that need to be written, avoiding problems caused by mismatch in data formats and simplifying code maintenance.

Aug 14, 2025 pm 06:18 PM

How to sort an array in Java?

Use Arrays.sort() to sort the array, 1. Sort(arr) in ascending order for the basic types; 2. Sort(arr,comparator) for objects or custom sorting, use Arrays.sort(arr,comparator), such as Comparator.reverseOrder() or Comparator.comparing(); 3. You can specify the sorting range Arrays.sort(arr, fromIndex, toIndex); 4. The basic types do not support Comparator, and you need to use a wrapper class to implement custom sorting such as descending order. The final result is to modify the ascending order of the original array or specify the order.

Aug 14, 2025 pm 06:14 PM

DynamoDB's massive data efficient query strategy

Efficiently obtaining massive amounts of data from DynamoDB in the Spring Boot REST API is a challenge, especially to avoid loading all data into memory. DynamoDB returns up to 1MB of data in a single request, so a paging mechanism is required to process large amounts of data. Scan operations on large data sets should be avoided because it is not scalable and expensive, and it is recommended to revisit business requirements or consider database solutions that are more suitable for analytical queries.

Aug 14, 2025 pm 06:06 PM

What are terminal operations in Java Streams?

TerminaloperationsinJavaStreamstriggertheprocessingofthestreamandproducearesultorsideeffect,afterwhichthestreamisconsumedandcannotbereused;commontypesincludereductionoperationslikecollect,reduce,andcount,matchingoperationssuchasanyMatch,allMatch,andn

Aug 14, 2025 pm 05:59 PM

What is the difference between checked and unchecked exceptions in Java?

Checkedexceptionsmustbehandledordeclaredandareusedforrecoverableconditions,whileuncheckedexceptionsarenotenforcedbythecompilerandtypicallyindicateprogrammingerrors;specifically,checkedexceptionsextendException(butnotRuntimeException),areverifiedatcom

Aug 14, 2025 pm 05:44 PM

How to sort a Map by key in Java

To sort the keys of a Map, the easiest way is to use TreeMap, which will automatically sort according to the natural order of the keys or custom comparators; 1. For comparable types such as String or Integer, pass the original Map directly into the TreeMap constructor to achieve natural sorting; 2. To customize the order, such as reverse order or ignoring case, you can pass the comparators such as Collections.reverseOrder() or String.CASE_INSENSITIVE_ORDER to TreeMap; 3. If you need to use streaming, you can call sorted(Map.Entry.comparin through Java8's Stream API; 3. If you need to use streaming, you can call sorted(Map.Entry.comparin through Java8's StreamAPI;

Aug 14, 2025 pm 05:35 PM

Implementing a SQL connection based on Windows authentication in a Docker container

This article aims to solve the challenges encountered when connecting to SQL Server databases that require Windows authentication in Docker containers. Since Windows containers do not join domains by default, it is impossible to use traditional domain accounts or computer accounts for authentication directly. The article will explore in-depth why this problem causes the error of sqljdbc_auth.dll loading, and will introduce in detail how to use Group Management Service Account (gMSA) as the core solution to enable containers to access domain resources safely and efficiently, providing implementation concepts and considerations.

Aug 14, 2025 pm 05:09 PM

Java 8 Lambda and Map: A Practical Guide to Refactoring Redundant If Statements

This article will explore in-depth how to use Java 8's Lambda expressions, Stream APIs, and Map data structures to gracefully reconstruct a large number of repeated if condition judgment statements in traditional code, especially null value verification for object fields. By abstracting and centrally managing the verification logic, we can significantly improve the readability, maintainability and scalability of our code, achieving a simpler and more efficient programming paradigm.

Aug 14, 2025 pm 04:39 PM

How to handle authentication with HttpClient in Java

ForBasicAuthentication,encodetheusernameandpasswordinBase64andsettheAuthorizationheaderwiththeprefix"Basic";alwaysuseHTTPStoprotectcredentials.2.ForBearerTokenAuthentication,includethetokenintheAuthorizationheaderwiththeprefix"Bearer&q

Aug 14, 2025 pm 04:25 PM

Implementing OAuth 2.0 and OpenID Connect in a Java Application

OAuth2.0isforauthorization,whileOpenIDConnect(OIDC)addsidentitylayerontopforauthentication.2.UseSpringBootwithspring-boot-starter-oauth2-clientandspring-boot-starter-securityforseamlessintegration.3.Configureidentityprovider(e.g.,Google)inapplication

Aug 14, 2025 pm 03:42 PM

java

How to work with JSON in Java

ToworkwithJSONinJava,useathird-partylibrarylikeJackson,Gson,orJSON-B,asJavalacksbuilt-insupport;2.Fordeserialization,mapJSONtoJavaobjectsusingObjectMapperinJacksonorGson.fromJson;3.Forserialization,convertJavaobjectstoJSONstringsviawriteValueAsString

Aug 14, 2025 pm 03:40 PM

java json

Performance Comparison: Java vs. Go for Backend Services

Gotypicallyoffersbetterruntimeperformancewithhigherthroughputandlowerlatency,especiallyforI/O-heavyservices,duetoitslightweightgoroutinesandefficientscheduler,whileJava,thoughslowertostart,canmatchGoinCPU-boundtasksafterJIToptimization.2.Gouseslessme

Aug 14, 2025 pm 03:32 PM

java go