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Technical Articles

Java

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Best practices for Java string comparison in Android Studio: Taking password verification as an example

This article aims to explore in-depth common pitfalls and best practices for Java string comparison in Android Studio development. This highlights why the equals() method should be used instead of the == operator for string content comparison in scenarios such as password verification, and provides robust suggestions to avoid null pointer exceptions. In addition, the article will also introduce how to use Lambda expressions, optimize Toast displays, and understand the comparison between CharSequence and String to improve the simplicity and maintainability of the code and help developers write more professional and efficient Android applications.

Aug 13, 2025 pm 12:21 PM

Distributed gapless sequence number generation scheme based on pessimistic locks and independent count tables

This article discusses the challenges and solutions for generating gapless serial numbers in a multi-application instance environment. In response to the problem that traditional methods may lead to gaps, a strategy based on pessimistic write locks based on independent count tables and databases is proposed. This solution effectively avoids the gap between serial numbers and maintains data integrity and continuity even in distributed high concurrency scenarios by encapsulating the generation and update operations of serial numbers in a single database transaction and using pessimistic locks to ensure the atomicity and isolation of concurrent access.

Aug 13, 2025 pm 12:18 PM

Understand Java method return value and data persistence

This article aims to explore in-depth the common causes of data loss in Java methods, especially when the method creates or modifies data (such as arrays) internally, and cannot obtain these updates externally. We will analyze Java's parameter passing mechanism in detail, explain why reassigning reference type variables inside the method will cause data to be "lost", and provide a solution to effectively pass data through the method return value, ensuring that the data can still be accessed and used by other parts of the program after the method is executed.

Aug 13, 2025 pm 12:12 PM

What are intermediate operations in Java Streams?

IntermediateoperationsinJavaStreamsaremethodsthatreturnanewstreamandareusedtobuildaprocessingpipelinewithoutexecutingimmediately.Theyarelazyandonlyrunwhenaterminaloperationisinvoked,allowingefficientchainingofoperationslikefilter,map,flatMap,distinct

Aug 13, 2025 pm 12:12 PM

Java Flight Recorder and Mission Control for Production Monitoring

JavaFlightRecorder (JFR) is a built-in low-overhead event recorder in JVM. It is open source and free from JDK11. It is used to collect runtime data such as GC, threads, method sampling, exceptions, class loading, CPU, I/O, etc., and is recorded as a .jfr binary file. It can be started through java-XX: FlightRecorder-XX:StartFlightRecording=...start or jcmd dynamically open; JavaMissionControl (JMC) is a supporting graphical analysis tool that can open .jfr files or monitor JVM in real time through JMX, providing visual analysis such as thread status, lock competition, hotspot methods, GC behavior, etc.

Aug 13, 2025 pm 12:03 PM

Java Text Processing: How to Calculate Word Letter Integration

This tutorial is designed to guide how to implement a word integral computing system in Java. By reading words in the text file and calculating the total points for each word based on the preset letter integral rules. The article will elaborate on how to correctly traverse characters in words, efficiently manage the mapping relationship between letters and integrals, and provide a robust Java code example, pointing out common implementation misunderstandings and best practices to ensure that the program can accurately calculate word integrals.

Aug 13, 2025 pm 12:03 PM

How to use void method to modify boolean state in Java

This article introduces how to use void methods in Java to change the state of a class's boolean type member variable. By encapsulating getter and setter methods, flexible control of boolean variables can be achieved, thereby changing the state of the object. The article provides an example of the Status class, showing how to initialize a boolean variable using a constructor and modify its value using the setOpen() method.

Aug 13, 2025 am 11:54 AM

What is the difference between GET and POST requests in a Java web application?

GET requests attach data to the URL, which is suitable for obtaining data and can be cached and collected, but is not safe and has a length limit; POST requests place data in the request body, which is suitable for submitting sensitive or large amounts of data, is more secure and has no size limit, but cannot be cached. JavaServlets use doGet() and doPost() respectively, so you should choose according to the operation type: use GET to obtain data, and use POST to change the server state.

Aug 13, 2025 am 11:52 AM

How to get the DatePicker value from the selected cell in TableView

This article aims to solve the problem of getting DatePicker values from selected cells in JavaFX TableView. The core is to handle the conversion between the LocalDate type and the String type, ensuring that the date data in the TableView is correctly passed to the DatePicker control. The article will provide two solutions, with code examples and notes, to help developers implement this functionality efficiently.

Aug 13, 2025 am 11:51 AM

Find elements in two ArrayList using linear search

This article describes how to compare two string types ArrayLists using a linear search algorithm in Java to determine if all elements in one list (such as shopping list) exist in another list (such as pantry list). We will explore how to implement this functionality through loop traversal and conditional judgment, and provide an alternative to optimizing search efficiency with HashSet.

Aug 13, 2025 am 11:45 AM

What is NIO (New I/O) in Java?

NIOprovidesamoreefficient,scalablealternativetotraditionalI/Obyusingchannelsandbuffers,enablingnon-blockingoperationsandevent-drivenhandlingviaselectors;1)itdiffersfromtraditionalI/Obybeingbuffer-orientedratherthanstream-oriented;2)supportsnon-blocki

Aug 13, 2025 am 11:38 AM

Java Swing: Solve the problem that images cannot be displayed on buttons

This article aims to solve the problem that images cannot be displayed normally on buttons in Java Swing programs. By adjusting the project structure, using the correct resource path, and ensuring the correct image format, the image display problem can be effectively solved and the user interface experience can be improved. This article will provide detailed steps and sample code to help developers quickly locate and fix related errors.

Aug 13, 2025 am 11:27 AM

Accurate verification of Boolean type value in Java

This article aims to provide a way to accurately verify Boolean type values in Java, ensuring that the input values are only true or false. We will explore how to handle null values, and how to verify the validity of the input without changing the data type, and provide corresponding code examples and precautions to help developers avoid potential errors.

Aug 13, 2025 am 11:24 AM

What is method overriding in Java?

MethodoverridinginJavaallowsasubclasstoprovideaspecificimplementationofamethodalreadydefinedinitsparentclass,requiringinheritance,matchingmethodsignatures,andenablingruntimepolymorphism;itmandatesthesamemethodname,parameters,andreturntype,permitsonly

Aug 13, 2025 am 11:20 AM