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Technical Articles

Java

javaTutorial

Exception isolation and processing in Java parallel method calls

This article discusses how to ensure that exceptions of a single task do not interrupt the entire processing flow when executing parallel method calls in Java. By leveraging the asynchronous features and error handling mechanism of CompletableFuture, combined with the unified collection strategy of results and exceptions, robust parallel processing can be achieved. Even if some tasks fail, other tasks can be completed normally, and finally summarize the execution results and exceptions encountered by all tasks, thereby improving the flexibility and user experience of the system.

Aug 11, 2025 pm 09:18 PM

Display console output in JAR application: System.out's visibility and redirection policy

This article aims to solve the problem that Java JAR applications cannot display System.out output when they are double-clicked to run. We will explore why this phenomenon occurs and provide two main solutions: one is to start the JAR file through the command line to display the output directly on the console, and the other is to write messages to the file by redirecting the standard output streams (System.out and System.err). The article will also compare the applicable scenarios of the two methods and briefly mention professional log management solutions to help developers effectively manage the runtime information of JAR applications.

Aug 11, 2025 pm 09:06 PM

how to use the switch statement in java

Java switch statements are used to execute different code blocks based on the values of variables or expressions. The basic syntax is: 1. The expression in switch (expression) must be of byte, short, int, char, String or enum type; 2. Each case is followed by a constant value and cannot be repeated; 3. Use break to prevent penetration; 4. Default is optional and executed when there is no match; 5. Java14 supports enhanced switch with arrows, which can return values and avoid penetration; 6. It is recommended to use when multiple branches and the conditions are discrete constants, and if-else is still used in complex conditions.

Aug 11, 2025 pm 09:01 PM

java switch statement

How to build a Java project with Gradle

InstallGradleusingSDKMAN,officialwebsite,orpackagemanagerandverifywithgradle-v.2.Createprojectdirectorystructurewithsrc/main/java,src/main/resources,andsrc/test/java,thenaddaHelloWorld.javafilecontainingamainmethodthatprints"Hello,Gradle!".

Aug 11, 2025 pm 08:59 PM

Guide to Generation and Verification of PBKDF2 Password Hash in Java

This tutorial introduces in detail how to generate and verify password hash using the PBKDF2 algorithm in Java. The core idea is that passwords are not stored directly, but are processed by adding salt hashing. During verification, the password entered by the user is hashed again with the stored salt value, and then the newly generated hash value is compared with the stored hash value to ensure the security and correctness of the password.

Aug 11, 2025 pm 08:45 PM

Strategies and practices for efficient processing of massive data retrieval of DynamoDB

This article aims to explore strategies and challenges for efficiently retrieving large amounts of data from Amazon DynamoDB. We will analyze the 1MB single request limit of DynamoDB in depth, compare the applicable scenarios and performance differences between Scan and Query operations, and propose a memory optimization solution for handling massive data streams in the Spring Boot REST API. At the same time, the article emphasizes the importance of reevaluating business needs to avoid unnecessary full data transmission and explores the need to consider alternative database solutions in specific scenarios.

Aug 11, 2025 pm 08:30 PM

Robust handling strategies for Socket exceptions in Java network programming

This article explores the common SocketException and StreamCorruptedException in Java network programming, especially when using ObjectInputStream/OutputStream for data transmission. The article analyzes the limitations of object flow, including its data overhead and high requirements for data integrity, and proposes alternative data transmission solutions, such as text-based BufferedReader/BufferedWriter or custom binary protocols. The core emphasizes the implementation of a robust exception handling mechanism in network applications to ensure the continuity and stability of the program flow.

Aug 11, 2025 pm 08:27 PM

Deeply understand the storage and object instantiation of Java methods in memory

This article deeply explores the memory allocation mechanism of methods and objects in Java. It is explicitly stated that Java methods are loaded by class in memory, rather than allocated separately for each object. When an object is instantiated, the main allocation is its field data and a small amount of runtime metadata. The code of the method itself is not repeatedly stored with each object, thus optimizing memory usage efficiency. Understanding this mechanism is essential for writing efficient Java code.

Aug 11, 2025 pm 08:21 PM

Guide to Generate Gapless Serial Numbers for Multiple Application Instances

This article introduces in detail how to use database pessimistic locking and transaction mechanisms to achieve gapless generation of serial numbers in a multi-application instance environment. By introducing a dedicated counter table and combining JPA's PESSIMISTIC_WRITE lock mode, we ensure that each serial number can be incremented uniquely and continuously in concurrent scenarios, effectively avoiding sequence number jumps or duplications caused by transaction rollback or other concurrency problems. It is suitable for business scenarios that require strict order and integrity.

Aug 11, 2025 pm 08:15 PM

How to create a package in Java

DefinethepackageusingthepackagekeywordatthetopoftheJavafile,suchaspackagecom.example.myapp;Createadirectorystructurethatmatchesthepackagename,forexample,com/example/myapp/forcom.example.myappSavetheJavafileinthecorrespondingdirectory,likeMyClass.java

Aug 11, 2025 pm 08:09 PM

How to manage dependencies in a Java project?

Using Maven or Gradle is the most effective way to manage Java project dependencies. By declaring dependencies in pom.xml or build.gradle, the tool will automatically download and parse the required libraries and their transitive dependencies. It also supports scope control (such as compile, test, provided) to optimize the construction and avoid conflicts. It uses dependency:tree or gradled dependencies to analyze the dependency tree, eliminate unnecessary transitive dependencies, and combines OWASPDependency-Check or gradle-versions-plugin to regularly update and check for security vulnerabilities. Team development can use Nexus or

Aug 11, 2025 pm 08:05 PM

java Dependency management

When to use StringBuilder vs String in Java

Whether to use String or StringBuilder depends on whether the text needs to be modified frequently: ① Use String when the text is fixed or modified less, because it is immutable, suitable for constants and simple splicing; ② Use StringBuilder when splicing or building strings multiple times in a loop, because it is variable and more efficient, avoiding the creation of a large number of intermediate objects; ③ The general rule is to use String for a small number of operations and StringBuilder for a large number of dynamic operations to improve performance and reduce memory overhead and garbage collection pressure.

Aug 11, 2025 pm 08:04 PM

Algorithm for finding parent nodes in a general tree: Based on breadth-first traversal

This article discusses in depth the algorithm for finding the parent node of a specified node in a general tree data structure. The article focuses on how to use breadth-first traversal (BFS) combined with queues to implement hierarchical sequence traversal. By traversing each layer of the tree, check whether the child node of the current node is the target. If it matches, the current node will be returned as the parent node. The article provides detailed Java code examples and explains implementation details and considerations, aiming to provide readers with a clear and efficient solution for general tree node search.

Aug 11, 2025 pm 08:03 PM

Optimize DynamoDB massive data reading: paging, streaming and performance considerations

DynamoDB faces a 1MB single request limit when handling large-scale data retrieval, which makes it complicated and inefficient to directly acquire hundreds of thousands of records. This article will explore in-depth how to overcome this limitation through a paging mechanism, implement data streaming to optimize memory usage, and emphasize efficient Query operations rather than Scan to ensure scalability. At the same time, the article will also discuss when other database solutions should be considered to help developers build high-performance, scalable data retrieval systems.

Aug 11, 2025 pm 08:00 PM