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Technical Articles

Java

javaTutorial

Optimize Spring Boot REST API response: Avoid overexposed JPA-associated data

In Spring Boot applications, when using JPA for data queries, REST API responses often overexpose unnecessary data due to inter-entity associations, which may occur even if lazy loading is configured. This article will explore how to precisely control API response content by customizing JSON serialization and leveraging Jackson annotations such as @JsonIgnore, @JsonView or DTO modes to ensure that only the data required by the front-end is returned, thereby improving performance and protecting data privacy.

Aug 12, 2025 pm 02:27 PM

How to use the HttpClient API in Java

The core of using the JavaHttpClientAPI is to create an HttpClient, build an HttpRequest, and process HttpResponse. 1. Use HttpClient.newHttpClient() or HttpClient.newBuilder() to configure timeouts, proxy, etc. to create clients; 2. Use HttpRequest.newBuilder() to set URI, method, header and body to build requests; 3. Send synchronous requests through client.send() or send asynchronous requests through client.sendAsync(); 4. Use BodyHandlers.ofStr

Aug 12, 2025 pm 02:27 PM

java

Java JAR application: Solve the problem of invisible console output and log redirection practice

Standard output such as System.out is usually invisible when a Java JAR application is run by double-clicking. This article will introduce how to capture program runtime information by redirecting standard output streams to files, and explore more professional log management solutions, as well as how to run JARs from the command line to view console output directly.

Aug 12, 2025 pm 02:21 PM

Deep analysis of Java object memory allocation: the impact of methods and interfaces on memory

Java objects allocate memory on the heap mainly for storing their fields (instance variables) and object headers, not methods. Methods (such as bytecode) are loaded only once to the JVM's method area (Metaspace) when the class is loaded, and are shared by all instances of the class. Therefore, even if an object is created through an interface reference, the memory size of that object depends only on the fields defined by its actual class, regardless of the number of methods or the reference type.

Aug 12, 2025 pm 02:18 PM

Java string comparison and code optimization practice in Android Studio

This article aims to solve the common Java string comparison misunderstanding in Android development, emphasizes that content comparison should be compared with the equals() method rather than the == operator, and provides strategies to avoid NullPointerException. At the same time, the article will also introduce how to use Lambda expressions to simplify event listener code, as well as other optimization techniques to improve code simplicity and readability, helping developers write more professional and efficient Android applications.

Aug 12, 2025 pm 02:15 PM

In-depth guide to configuring Docker containers to connect to Windows certified SQL Server

This article explores the challenges facing connecting to SQL Server databases that require Windows authentication in Docker containers. This highlights why the common sqljdbc_auth.dll fails to load, and introduces in detail the Group Managed Service Accounts (gMSA) as a solution to implement domain authentication in Windows containers. At the same time, the article also clearly points out the limitations of Linux containers in this scenario and provides corresponding alternatives to help developers choose the connection strategy that is most suitable for their application environment.

Aug 12, 2025 pm 02:12 PM

How to use an Iterator in Java

Use Iterator to safely traverse and modify collections. 1. Get the Iterator object through the iterator() method of the collection; 2. Use hasNext() to determine whether there is a next element, and then use next() to obtain the element; 3. After calling next(), you can call remove() to safely delete the element to avoid ConcurrentModificationException. Unlike enhanced for loops, Iterator allows elements to be deleted during traversal, which is suitable for collection types such as List and Set, and is a reliable choice when modifying the collection.

Aug 12, 2025 pm 02:02 PM

$Java text processing: Efficient calculation of word letter fractions tutorial$

Java text processing: Efficient calculation of word letter fractions tutorial

This tutorial is designed to guide you how to accurately calculate the letter fraction of a word in a text file in Java. The article will analyze common programming misunderstandings in depth and provide two core methods: by traversing string characters and using switch statements, or using Map data structures to achieve more flexible alphabetical fraction mapping. Help readers master efficient and robust word score calculation logic through instance code and best practices.

Aug 12, 2025 pm 01:57 PM

What is the difference between the throw and throws keywords in Java?

throw is used to manually throw exceptions within a method, throws is used to declare possible checked exceptions in the method signature. 1. Throw is followed by an exception object instance, used to throw exceptions immediately; 2. Throws is followed by an exception class name, which can be declared multiple times to inform the caller that it needs to handle potential exceptions; 3. Throw can be used for runtime or checked exceptions, while throws is necessary for checked exceptions, and can be optional for runtime exceptions; 4. The two are often used in combination, throw executes throws, and throws declares them.

Aug 12, 2025 pm 01:45 PM

What is a sealed class in Java?

AsealedclassinJavarestrictswhichclassescanextendit,enhancingcontroloverinheritance;itisdefinedusingthesealedkeywordandpermitsclausetolistallowedsubclasses:1.UsepublicsealedclassClassNamepermitsSubclass1,Subclass2,Subclass3todeclareasealedclass.2.Ensu

Aug 12, 2025 pm 01:44 PM

java

Retrieve DatePicker values from JavaFX TableView

This article describes how to retrieve the value of a DatePicker in a JavaFX TableView and set it back to the DatePicker control. The core is to understand the matching between TableColumn's data type and the data type expected by DatePicker, and how to perform the necessary type conversion. The article provides two solutions: modify the data type of TableColumn to LocalDate, or perform date parsing when setting the DatePicker value.

Aug 12, 2025 pm 01:42 PM

How to use the final keyword in Java

Once the final variable is assigned, it cannot be changed. The object reference cannot be re-pointed, but its state can be modified; 2. The final method cannot be rewritten by subclasses to ensure that the core logic is not tampered with; 3. The final class cannot be inherited and is used to create immutable classes or protect key classes; the rational use of final can improve code security, maintainability and thread safety. It is recommended to use final by default unless it needs to be extended or modified.

Aug 12, 2025 pm 01:39 PM

Android ImageView Anchor Scaling Implementation Tutorial

This tutorial explains how to zoom in on images by dragging the anchor points at the four corners of ImageView in Android. By listening to touch events, calculate the distance change between the touch point and the center point of the ImageView, and adjust the ScaleX and ScaleY properties of the ImageView to achieve the scaling effect of the image. This tutorial provides detailed code examples to help developers implement this feature quickly.

Aug 12, 2025 pm 01:39 PM

How do you create a custom exception in Java?

TocreateacustomexceptioninJava,defineaclassthatextendsExceptionforcheckedexceptionsorRuntimeExceptionforuncheckedones,enablingmeaningfulerrorhandling;2.ExtendExceptionwhencallersmusthandletheerror,asitenforcestry-catchorthrowsdeclaration;3.ExtendRunt

Aug 12, 2025 pm 01:38 PM