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Deeply understand the generation and processing of full permutations in Java

This article aims to elaborate on how to generate a full permutation of arrays in Java, and provide a correct way to process each permutation one by one based on common misunderstandings of combining all permutations into one large array for processing. We will use the "recruiting assistant" problem as an example to demonstrate how to efficiently traverse and analyze each independent permutation, ensure the accuracy of the algorithm logic, and compare the theoretical calculation results to deepen our understanding of permutation combination processing.

Aug 28, 2025 pm 12:12 PM

Custom sorting of TreeMap based on values ??causes data loss and solutions

This article aims to solve the problem of data loss because Comparator treats keys with the same value as equal when sorting TreeMaps with custom Comparator. We will analyze the cause of the problem and provide a secure Comparator implementation to avoid data loss and potential NullPointerException. Through this article, you will learn how to correctly sort TreeMaps with custom Comparator and ensure data integrity.

Aug 28, 2025 pm 12:09 PM

Java loop control: master string comparison to achieve specific condition termination

This article aims to solve the common problem of loop termination based on specific string input in Java. It focuses on explaining the misunderstanding of using the == operator to compare strings, and explains in detail how to correctly use the equals() or equalsIgnoreCase() method to compare string contents, so as to achieve precise loop control and avoid logical errors that beginners often make.

Aug 28, 2025 pm 12:06 PM

Building a mail client with Java Socket: Solve authentication issues

This article aims to guide developers on how to build a simple mail client using Java Socket, focusing on solving authentication problems encountered when connecting to an SMTP server without a Java Mail library. The article will introduce in detail how to use the EHLO command instead of the HELO command, and how to authenticate users through the AUTH PLAIN mechanism, and provide corresponding code examples and precautions to help readers successfully send emails.

Aug 28, 2025 pm 12:03 PM

Retrieve data from JSON objects using JSON Simple library

This article describes how to use the JSON Simple library to extract specific data from a JSON object. Through a simple example, it demonstrates how to parse JSON strings and use key-value pairs to obtain the required data, avoiding common null pointer errors, and helping developers quickly get started with JSON data processing.

Aug 28, 2025 am 11:57 AM

SmallRye Mutiny: Solution to subscribe to unresponsive when processing events asynchronously

When using SmallRye Mutiny for asynchronous event processing, if the subscriber does not receive any events, it is usually caused by the backpressure mechanism of Reactive Streams. Subscribers need to manually request data from publishers to trigger the delivery of events. This article will introduce how to solve this problem through the Subscription object and request(long) method, as well as the cleaner API provided by Mutiny to ensure the normal operation of the asynchronous event processing process.

Aug 28, 2025 am 11:54 AM

Traps and solutions for ArrayList reference passing in Java: Avoid unexpected data modification

This article discusses common data sharing problems caused by reference passing in Java by ArrayList when creating objects. When the same ArrayList instance is reused and emptied, all data of objects referencing it will be updated unexpectedly synchronously. The core solution is to re-instrate a new ArrayList object every time independent data is needed, ensuring that each object holds its own exclusive copy of the data, thus avoiding data confusion and unexpected modifications.

Aug 28, 2025 am 11:51 AM

Cache Introspect requests in Spring Security

This document describes how to cache Opaque Token Introspection requests in Spring Security OAuth2 resource servers to improve system availability and performance when authentication servers are unstable. By customizing OpaqueTokenIntrospector and integrating the cache mechanism, we can effectively reduce dependence on the authentication server, avoid frequent 401 errors, and improve user experience.

Aug 28, 2025 am 11:48 AM

Generate titles that accurately express the subject of the article Use do-while to draw rectangles

This article will describe how to use the do-while loop in Java to draw a rectangle with a specified height and width. By analyzing common questions, we will provide optimized code examples and explain key steps to help readers understand the correct use of do-while loops, avoid problems such as infinite loops, and thus master the core concepts of loop control.

Aug 28, 2025 am 11:36 AM

Deeply understand the limitations of using constructors and this references in Java

This article aims to parse the reason why using this reference in the inherited class constructor in Java causes the compilation error of "Cannot reference 'this' before supertype constructor has been called". This error stems from the Java object initialization mechanism, that is, the subclass instance has not been fully initialized before calling the parent class constructor. The article will dig deep into the principles behind this limitation, especially the “chicken egg, egg chicken” problem when it comes to circular dependencies and final fields, and provide professional methods and code examples to solve such problems by breaking circular dependencies, adjusting field modifiers, or refactoring the design.

Aug 28, 2025 am 11:27 AM

Connecting a remote Elasticsearch host using RestHighLevelClient

This article describes how to configure Elasticsearch's RestHighLevelClient to enable it to connect and index documents to a remote Elasticsearch host. By modifying the configuration of HttpHost, replacing the default localhost with the IP address or domain name of the remote host, and specifying the port number, you can achieve remote connection. Ensure that the remote host is accessible from the host running the code and replace the IP address and port in the example based on the actual situation.

Aug 28, 2025 am 11:09 AM

RecyclerView efficient update guide: Avoid full refresh and DiffUtil application practice

This tutorial aims to solve the problem of full refresh of RecyclerView when data is updated, especially for FirebaseRecyclerAdapter users. We will first correct common misuses of FirebaseRecyclerAdapter to ensure its efficient real-time update capabilities. Then, we will introduce in detail how to use the DiffUtil class to implement local data updates of custom adapters to avoid unnecessary UI redraws, thereby significantly improving application performance and user experience.

Aug 28, 2025 am 11:06 AM

How to get Flink aggregated data in Spring Boot application

This article describes how to integrate Flink in Spring Boot applications and solve the problem of getting aggregated results from Flink unbounded data sources. For the characteristics of unbounded data sources, the idea of ??converting data sources into bounded data sources is provided to return aggregated results in the API interface of Spring Boot applications.

Aug 28, 2025 am 10:57 AM

Java multithreaded task scheduling: efficient processing strategy for shared task lists

This article explores in-depth how to handle shared task lists efficiently and safely in Java multithreaded environment. The core strategy is to leverage the ExecutorService framework, which can automatically manage thread pools and schedule tasks to available threads, thus avoiding complex manual synchronization mechanisms. The article will also briefly introduce BlockingQueue as an alternative to the underlying mechanism or manual implementation of task distribution, and provide actual code examples and precautions.

Aug 28, 2025 am 10:51 AM