Article Tags
Article Tags
Java assert keyword: Correct usage of debugging tools
Java's assert keyword is mainly used to check the invariance conditions inside the program during the development and debugging stages to find logical errors. It should not be used for input validation or business logic judgment in production code, because the assert statement is disabled by default and needs to be explicitly enabled through JVM parameters. Using it for non-debugging purposes can cause the program to behave unexpectedly in a production environment, so exception handling should be used for external input validation and comments should be used for logic explanation.
Dec 31, 2025 am 07:45 AM
Java Stream API: Efficiently find the sum of two numbers in an array
This article explores how to use the Java 8 Stream API to optimize the problem of finding the sum of two numbers in a list of integers equal to a specific target value. By introducing the Set data structure, the O(n²) time complexity of traditional nested loops is optimized to O(n), and it is further demonstrated how to convert this efficient iteration method into a concise and declarative Stream API implementation, including two forms with log output and only returning Boolean results, thus improving the readability and execution efficiency of the code.
Dec 31, 2025 am 07:36 AM
Decrypting the Facade and Service Layer Patterns: Distinguishing the Structure and Architecture of Design Patterns
Facade pattern is a structural design pattern that aims to provide a simplified interface for complex subsystems. The service layer pattern is an architectural design pattern. Its core is to logically group and organize services to ensure that related functions are gathered together. The main difference between the two is that Facade focuses on simplifying interfaces and hiding underlying complexity; the service layer focuses on the organization and division of responsibilities of services and manages business logic.
Dec 31, 2025 am 07:27 AM
Solving Infinite Loops in Grid Path-Finding Algorithms: A Guide to Improving Depth-First Search
This tutorial aims to solve the common infinite loop problem in grid path finding algorithms. By analyzing the flaws of the original algorithm, such as greedy exploration and lack of access records, we introduce an improved scheme based on depth-first search (DFS). The core is to maintain a multi-path exploration mechanism and use path self-crossing detection to effectively avoid repeated visits, thereby ensuring that the algorithm can find the target path stably and correctly.
Dec 31, 2025 am 07:18 AM
Using Jackson to deserialize JSON mixed type array to base class list
This article details how to use the Jackson library to process JSON arrays containing multiple different object types and deserialize them into a list of base classes in Java. By introducing @JsonTypeInfo and @JsonSubTypes annotations, combined with the Id.DEDUCTION strategy, Jackson can intelligently identify and instantiate base class and subclass objects contained in JSON data, effectively solve UnrecognizedPropertyException, and achieve flexible polymorphic data mapping.
Dec 31, 2025 am 06:54 AM
Correct usage of YAMLMapper when parsing nested key names with dot (.)
Jackson's YAMLMapper does not treat the dot (.) as a nested path separator by default; it strictly follows the YAML specification and treats formatting.template as a complete key name rather than a nested structure, so it needs to be matched with the correct JSON Pointer path (such as /formatting.template) to accurately locate it.
Dec 31, 2025 am 06:45 AM
Java array linear search: principles, implementation and applications
This article details the implementation of the linear search algorithm in Java. By creating a specialized function, you demonstrate how to iterate through an array to find a specific element and return its index position or a special value indicating that it was not found. The tutorial covers the complete process of function design, parameter passing, return value processing, and calling and interpreting results in the main method. It is designed to help beginners master basic array search technology.
Dec 31, 2025 am 06:30 AM
What is a constructor in Java? (Code and Explanation)
The Java constructor is a special method with the same name and no return type, used to initialize new objects; it supports overloading, and the default constructor is automatically provided but disappears after customization. You can use this() to call other constructors.
Dec 31, 2025 am 06:03 AM
How to read a CSV file in Java? (Code Tutorial)
Use the OpenCSV library to safely parse CSV files, which automatically handles edge cases such as quoted fields, embedded commas, and newlines; it is recommended to read line by line to save memory, and supports mapping as objects through CsvToBean to avoid manual split or raw stream parsing.
Dec 31, 2025 am 05:53 AM
Flexible parsing and verification of M/d/yyyy and MM/dd/yyyy date formats in Java
This article aims to provide an effective method to flexibly parse and verify the two date formats M/d/yyyy and MM/dd/yyyy in Java. For Java 8 and higher versions, it is recommended to use java.time.format.DateTimeFormatter with the pattern string M/d/yyyy for intelligent parsing. For the Java 7 environment, it is recommended to introduce the ThreeTen Backport library to achieve the same function, thereby avoiding the problems that may be caused by complex regular expressions and traditional SimpleDateFormat, and ensuring the accuracy of date format and content.
Dec 31, 2025 am 05:39 AM
How to fix an OutOfMemoryError in Java?
AnOutOfMemoryErroroccurswhenJVMexhaustsmemory;analyzeerrortype(heap,metaspace,GCoverhead,thread),increaseheapsize(-Xmx),checkleaksviaprofilersandheapdumps,optimizeobjectuse,tuneGC(e.g.,G1GC),fixmetaspaceissues(-XX:MaxMetaspaceSize),andvalidatefixes.
Dec 31, 2025 am 05:39 AM
Object reference management and linked list data structure implementation in Java
This article aims to address the common misunderstanding in Java of trying to change the reference of the object itself, especially when implementing data structures such as linked lists. This article will delve into the Java reference passing mechanism, explain why this reference cannot be reassigned, and provide a standard and recommended solution: indirectly manage the element links in the data structure by introducing the internal node (Node) class, thereby achieving operations such as adding and deleting linked lists, ensuring the correctness and maintainability of the data structure logic.
Dec 31, 2025 am 05:33 AM
How to create a singleton class in Java? (Full Example)
The Java singleton pattern is implemented through private constructors, static instance fields and public static get methods; it is recommended to use enumerations because of their natural thread safety, serialization safety and simplicity.
Dec 31, 2025 am 05:18 AM
How to read a properties file in Java? (Code Example)
Java needs to use the Properties class to cooperate with InputStream to read the properties file. It supports two methods: class path (getResourceAsStream) and file system path (Files.newInputStream). It needs to handle exceptions, close the stream, and can set default values and type conversions.
Dec 31, 2025 am 05:15 AM
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