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Technical Articles

Java

Application of generic interfaces in inheritance: Solve the problem of type mismatch

This article discusses the type matching problem encountered when using generic interfaces for inheritance in Java. Through the example code, we explain in detail how to solve the type incompatibility problem encountered when subclasses initialize parent-class generic interface variables by defining the parent class as well, or using wildcards, and emphasize the importance of declaring interface methods as public.

Aug 15, 2025 am 08:15 AM

Tutorial on username verification based on regular expressions in Java

This tutorial details how to use regular expressions in Java to strictly validate usernames. The content covers regular expression construction of core rules such as username length, starting characters, allowed characters, and cannot be underscore-end, and provides clear code examples and detailed regular component analysis to help developers efficiently implement username verification logic that meets business needs.

Aug 15, 2025 am 08:09 AM

Resolve Java JNI error in VS Code on macOS Ventura

This article aims to help developers resolve JNI errors encountered when running Java programs using VS Code on macOS Ventura systems. By analyzing the error message, it is clear that the root cause of the problem is that the file path contains special characters (such as Emoji or non-ASCII characters). The article will provide detailed troubleshooting steps and solutions to ensure that Java programs run smoothly in VS Code.

Aug 15, 2025 am 08:03 AM

How to validate exact True and False values using boolean types in Java?

This article describes how to strictly verify the value of a Boolean type variable in Java, ensuring that the input value must be true or false. By using the Optional class to perform null value security checks and combined with string comparisons, we provide a method to achieve accurate verification without changing the variable type, effectively avoiding program exceptions caused by input errors.

Aug 15, 2025 am 07:54 AM

Java 2D Array: Dynamic Size and Efficient Traversal Guide

When processing two-dimensional arrays (matrixes) in Java, there is no need to know their specific dimensions in advance. Java treats a two-dimensional array as an "array of arrays", so you can get the number of rows through array.length and get the number of columns through array[0].length (assuming it is a rectangular array). Once you master these properties, you can use nested loops to traverse the entire matrix safely and efficiently, thus achieving flexible data processing.

Aug 15, 2025 am 07:51 AM

Strategy for safely updating final ConcurrentHashMap in high concurrency scenarios

This article discusses how to safely and effectively update a ConcurrentHashMap declared final in high concurrency Java applications to avoid instantaneous data inconsistency during the update process. In view of the shortcomings of the putAll() method after the traditional clear(), the article proposes a step-by-step update strategy and deeply analyzes its limitations. It also provides professional advice for more complex concurrent scenarios, aiming to ensure the continuity and data integrity of the system during data update.

Aug 15, 2025 am 07:03 AM

Java Concurrency Utilities: A Deep Dive into Executors and Fork/Join

UsetheExecutorsframeworkformanagingindependent,short-livedtaskswithcontrolledconcurrency,suchashandlingwebrequests,byleveragingthreadpoolslikenewFixedThreadPoolandalwayscallingshutdown();2.UsetheFork/JoinframeworkforCPU-intensive,recursivedivide-and-

Aug 15, 2025 am 06:28 AM

Flexible application of generic interfaces: Solve the problem of inheritance and type parameters mismatch

This article aims to explain how to solve the problem of type parameter mismatch caused by inheritance relationships when using generic interfaces. By defining the parent class as a generic class, or using wildcard characters, you can effectively resolve compilation errors encountered when subclasses initialize parent generic interface variables. This article will provide detailed code examples and two solutions to help developers better understand and apply generic interfaces.

Aug 15, 2025 am 06:06 AM

What is the difference between String, StringBuilder, and StringBuffer in Java?

String is immutable and thread-safe, suitable for fixed text; StringBuilder is mutable and non-thread-safe, with high performance, suitable for frequent string operations in single-thread environments; StringBuffer is mutable and thread-safe, suitable for multi-thread environments, but its performance is low due to low synchronization overhead.

Aug 15, 2025 am 05:51 AM

java string

How to profile a Java application?

Startwithbuilt-intoolslikejvisualvmandjconsoleforreal-timeCPU,memory,andthreadmonitoring,enablingJMXforremoteaccess;2.Useadvancedprofilerssuchasasync-profilerforlow-overheadproductionprofilingofCPU,memory,andlockcontention,orcommercialtoolslikeYourKi

Aug 15, 2025 am 05:31 AM

How does a switch on a String work in Java?

AswitchonaStringinJavaworksbyusingthestring’shashCode()toenableefficientdispatch,followedbyanequals()checktoconfirmthematch,ensuringcontent-basedcomparisonratherthanreferencecomparison;thecompilertranslatesitintooptimizedbytecodeusinglookupswitchorta

Aug 15, 2025 am 05:23 AM

How to check if a list of integers contains only odd numbers in Java

Use for-each to loop through the list. If an even number is encountered, it will return false immediately. Otherwise, it will return true after the loop is over; 2. Use the allMatch method of Java8Stream to check whether all elements meet odd-number conditions; 3. If you need to exclude an empty list, you can add an additional!numbers.isEmpty() to judge; both methods return true when an empty list, and negative numbers can be handled correctly. Finally, choose an implementation method with better readability or better performance according to your needs.

Aug 15, 2025 am 04:54 AM

How to use Atomic variables in Java

Atomic variables are suitable for thread-safe operations of a single variable. 1. Select the appropriate atomic class such as AtomicInteger, AtomicLong, AtomicBoolean or AtomicReference according to the data type; 2. Use atomic methods such as get, set, incrementAndGet, and compareAndSet to achieve lock-free thread-safe operations; 3. Only used for simple shared states such as counters and flag bits, and are not suitable for scenarios involving multivariable or composite operations; 4. It is based on the CAS mechanism, and its performance is better than locks under low and medium competition, but performance may decline due to retry when competing with high competition; therefore, atomic variables should be used first for simple thread safety requirements.

Aug 15, 2025 am 04:13 AM

What is a CallableStatement in Java?

CallableStatement is used in Java to call database stored procedures safely and efficiently. It inherits from PreparedStatement and supports the creation of stored procedures through the Connection.prepareCall() method and uses the {callprocedure_name(?,?,?)} syntax to call stored procedures. It can set input parameters, register output parameters and execute them. It is suitable for scenarios where IN, OUT or INOUT parameters need to be passed, multiple result sets, encapsulated database logic or improved performance, such as calling the getEmployeeSalary stored procedure to obtain employee salary or calling the getEmployeeCount function system

Aug 15, 2025 am 04:03 AM

java