Article Tags
Article Tags
Serializing generic classes: handling nested generics and unknown types
This article explores the issues encountered when serializing complex generic classes in Java, specifically when dealing with nested generics and wildcard types. It focuses on how to utilize the type information stored in a generic class for deserialization, and provides an example of using isAssignableFrom for type checking. Additionally, the application of the visitor pattern when dealing with large numbers of types is briefly mentioned.
Dec 31, 2025 am 01:27 AM
How to handle GET and POST requests in Java Servlets? (A Basic Tutorial)
UsedoGet()forGETanddoPost()forPOSTrequests—bothinheritedfromHttpServlet.GETretrievesdataviaURLparameters;POSTsubmitsdatainthebody.Validatennput,setencodings,usepropercontenttypes,andfollowsecuritybestpracticeslikeXSSpreventionanderrorhandling.
Dec 31, 2025 am 01:24 AM
Spring Boot microservice controller testing: efficient simulation of external services and JWT authentication strategy
In response to the 404 problem caused by trying to call external authentication services in the Spring Boot microservice controller test, this article will delve into the strategy of handling external dependencies in the unit/integration test environment. We will focus on how to avoid initiating real cross-service HTTP requests in tests and ensure the independence, stability and execution efficiency of the test by directly generating test JWT or simulating the JWT verification mechanism, thereby focusing on the core business logic of the service under test.
Dec 31, 2025 am 01:15 AM
Solve Git cloning lag in IntelliJ IDEA: executable file path configuration and troubleshooting
This tutorial aims to solve the problem of long-term lag in Git cloning operation in IntelliJ IDEA. The core solution involves checking and correcting the path configuration of the Git executable, especially for Windows users. The article will also discuss potential authentication issues and network delays, and guide users on how to use IDE logs for in-depth troubleshooting to ensure smooth Git operations.
Dec 31, 2025 am 12:30 AM
Finding Minimum Value in Java Array: Common Pitfalls and Guide to Correct Implementation
This article elaborates on the correct way to find the minimum value in a Java array, and provides an in-depth analysis of two key mistakes that beginners often make: mistakenly adding a semicolon after the if conditional statement, causing logic failure, and incorrectly returning the minimum value as an array index. By analyzing the root cause of the problem and providing corrected code examples, it aims to help developers build robust and accurate minimum value finding algorithms.
Dec 31, 2025 am 12:24 AM
Jackson DTO deep copy: non-invasively ignore specific types and their array fields
This article explores how to non-intrusively ignore non-serializable fields when doing DTO deep copies with Jackson, especially when those fields are arrays of a specific type. Through ObjectMapper#addMixIn() and @JsonIgnoreType, you can flexibly exclude types such as MultipartFile and its array MultipartFile[], thereby avoiding serialization exceptions and achieving smooth cloning of DTOs. The article also points out the limitations of generic collections (such as List).
Dec 31, 2025 am 12:03 AM
Generating lazy streams from fixed expressions in Java: Supplier-based practice
This article details how to use the Supplier interface and the Stream.of() method in Java to create a lazy-evaluated stream from a set of fixed expressions. By encapsulating each expression as a Supplier instance and constructing a Stream, we can effectively delay the execution of the expression until the terminal operation in the stream pipeline is triggered, thereby achieving performance optimization and resource management.
Dec 30, 2025 am 10:27 AM
How to gracefully handle dynamic request bodies in Spring Boot controllers
This tutorial aims to solve the processing challenges when the API request body structure changes in Spring Boot applications. We will explore the limitations of using HashMap, and focus on how to flexibly and robustly map and process request data of different structures by defining POJO (Plain Old Java Object), thereby improving the readability, maintainability and stability of the code.
Dec 30, 2025 am 10:21 AM
In-depth analysis of Java method parameter passing: array reference and value passing mechanism
Java uses a value passing mechanism to handle all method parameters. For object types (including arrays), a copy of the object reference is passed. This means that reassigning the parameter reference inside the method to point to a new object does not affect the original reference in the caller. If you need to change the object referenced by the caller, you must modify the original object content within the method, or return a new object and reassign it by the caller.
Dec 30, 2025 am 09:45 AM
Based on the greedy strategy, the target number is constructed by the sum of digital strings containing only 0 and 1
This article details an algorithm for generating a target number by superimposing strings containing only the digits 0 and 1. The core strategy is the greedy method, that is, in each iteration, build the largest 0/1 number string possible, decide to place 1 or 0 by checking whether each bit of the target number is greater than 0, and reduce the number of digits of the target number accordingly. Finally, the number of iterations is the minimum number of 0/1 number strings required.
Dec 30, 2025 am 09:39 AM
Avoid regular expressions: Use DateTimeFormatter to parse flexible date formats
This article aims to provide a professional method to efficiently parse multiple date formats (such as MM/dd/yyyy and M/d/yyyy) in Java. We'll explore how to take advantage of DateTimeFormatter's flexible mode to handle date strings gracefully by specifying a minimum number of digits instead of a fixed number of digits, thereby avoiding the use of complex regular expressions and solving the misparsing problems that may result from traditional SimpleDateFormat. At the same time, the article will also provide solutions to implement this function in the Java 7 environment.
Dec 30, 2025 am 09:33 AM
Memory footprint and life cycle analysis of object instances created by Java static methods
This article takes an in-depth look at the memory behavior and life cycle of static methods in Java when creating object instances. The core idea is that objects created by static methods are not "static instances". They are stored on the heap like ordinary objects and follow the same garbage collection rules. The article clarifies the relationship between static methods, class loading, and object reachability, and points out that the object creation mechanism (such as the builder pattern) itself does not affect its memory footprint or garbage collection eligibility. The key lies in the reference reachability of the object.
Dec 30, 2025 am 09:18 AM
Efficiently parse nested object data in JSON arrays in Java
This tutorial details how to parse a JSON array containing nested JSON objects in Java to extract specific fields like 'id' and 'result'. The article will demonstrate two main methods: traditional loop iteration combined with POJO/Record, and the use of Java Stream API for more concise functional processing, aiming to help developers process complex JSON responses efficiently and robustly.
Dec 30, 2025 am 09:06 AM
In-depth analysis of Java static methods, class members and initialization mechanism
This article explains in detail the use of the static keyword in Java, especially how to transform instance methods into static methods and effectively manage static variables. Through an example of a student management system, we will delve into the restrictions on the use of this keyword in static methods, the correct initialization strategy for static arrays, and the best practice of one-time configuration of static initialization blocks during class loading, aiming to improve the robustness and maintainability of the code.
Dec 30, 2025 am 09:03 AM
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