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Technical Articles

Java

javaTutorial

Advanced Hibernate Performance Tuning for Java

1. To solve the N 1 query problem, you need to use JOINFETCH, @BatchSize or @EntityGraph to optimize the acquisition strategy; 2. Enable the secondary cache and query cache and reasonably configure the cache area and expired policies; 3. Use StatelessSession to process batch operations, control the transaction scope, and regularly flush and clear sessions to avoid memory overflow; 4. Use @DynamicUpdate, delay loading of large fields, and avoid EAGER's @OneToMany and other mapping optimization to reduce database overhead; 5. Enable Hibernate statistics, integrate monitoring tools and analyze the continuous observation performance of SQL execution plans, and finally adjust based on actual data rather than assumptions.

Sep 01, 2025 am 07:48 AM

java

What is a JAR file in Java?

AJARfileinJavastandsforJavaArchive,whichisapackagedfileformatusedtoaggregatemultipleJavaclassfiles,metadata,andresourcesliketextorimagesintoasinglecompressedfileforeasydistributionanddeployment.ItisessentiallyaZIP-formatfiletailoredforJava,enablingef

Sep 01, 2025 am 07:19 AM

java jar file

Java programming: Calculate the percentage of vocabulary attributes of user input strings

This tutorial details how to receive user input strings in Java and use regular expressions to calculate the percentage of strings that match specific vocabulary attributes (such as pure letter words, initial capital words). The article covers input validation, data storage, regular expression matching, and modular counting methods, aiming to provide a clear and efficient solution.

Sep 01, 2025 am 07:06 AM

Format datetime using Jackson's @JsonFormat annotation

This article introduces how to use the @JsonFormat annotation of the Jackson library to format the date and time fields in Java objects to solve the problem that the @DateTimeFormat annotation in the Gson library does not take effect. By using @JsonFormat, you can precisely control the format of date and time fields during serialization and deserialization, ensuring data consistency and readability.

Sep 01, 2025 am 06:42 AM

Passing variables across scenes in Cucumber: A feasible but not recommended approach

This article explores technical approaches to pass variables across different scenarios in Cucumber testing, and although technically feasible, it is highly recommended to avoid this practice from a test design perspective. The article will introduce the use of global variables and Cucumber's Background keyword to achieve cross-scene variable sharing, and emphasize the importance of independent scenarios.

Sep 01, 2025 am 06:18 AM

How to calculate the sum of infinite interlaced series using Java: Taylor Series Approximation Tutorial

This tutorial explains in detail how to calculate the sum of infinite interleaved series S = -(2x)^2/2! (2x)^4/4! - (2x)^6/6! ... within a specified interval. The content covers Taylor expansion of the series as cos(2x) - 1, analyzes common implementation errors, and provides an efficient and accurate Java iterative computing scheme, focusing on best practices for precision control and loop termination.

Sep 01, 2025 am 06:06 AM

What are wrapper classes and why are they used in Java?

Wrapperclassesareusedtoconvertprimitivedatatypesintoobjects,enablingtheiruseincollections,allowingnullvalues,providingutilitymethods,andsupportingautoboxing/unboxing.1.TheyallowprimitivestobeusedincollectionslikeArrayList,whichonlyacceptobjects.2.The

Sep 01, 2025 am 05:58 AM

java Packaging

How to integrate Java 19's preview features and incubator modules in Gradle projects

This tutorial details how to configure and use Java 19 preview features (such as virtual threads) and incubator modules (such as structured concurrency) in a Gradle project. By modifying the build.gradle file, you can enable the necessary JVM parameters for the compile and runtime environment, taking advantage of the latest experimental features of the Java platform.

Sep 01, 2025 am 05:48 AM

$The method of summing the infinite fraction equation in intervals$

The method of summing the infinite fraction equation in intervals

This article aims to provide an effective method for calculating the sum of the infinite fraction equation within a given interval [0.1, 1.5], as shown in the present invention. By analyzing the problems in the original code and providing improved Java code examples, this article will elaborate on how to correctly calculate the sum of the equation and ensure the accuracy of the results. At the same time, this article also emphasizes the importance of cyclic conditions and the accuracy problems that may be encountered in numerical calculations.

Sep 01, 2025 am 05:45 AM

How to group elements using the Java Stream API

Using the Collectors.groupingBy method of JavaStreamAPI can efficiently group elements. 1. Basic grouping: group elements by conditions through classification functions, such as grouping strings by first letter; 2. Group objects by field: group Person objects by age or city; 3. Multi-level nested grouping: Use multi-layer groupingBy to implement, first by age and then by city; 4. Combined with downstream collectors: can be used to count the number of each group with Collectors.counting(), sum of Collectors.summmingInt(), Collectors.mapping() to convert elements or Collec

Sep 01, 2025 am 05:45 AM

Android development: Tutorial on implementing the automatic button activation after the ProgressBar is loaded

This tutorial details how to listen to the loading progress of the ProgressBar and automatically enable specific buttons when it reaches its maximum value in Android applications. The article covers ProgressBar's XML configuration, progress updates and status judgments in Java code, and provides practical code examples to help developers improve user experience and interface interaction logic.

Sep 01, 2025 am 05:27 AM

Understanding Java generic type parameters and method overloading: Solve the problem of type mismatch in generic class object comparison

This article aims to explore in-depth compilation errors caused by type mismatch in Java generic programming when an instance of a generic class tries to compare with its internal encapsulation type or another generic instance. By analyzing the relationship between "has-a" and "is-a", we will clarify why method overloading is needed to handle different type parameters and provide clear solutions and sample code to help developers effectively manage type safety and flexibility in generic classes.

Sep 01, 2025 am 04:51 AM

Type parameter traps and solutions for object comparison in Java generic classes

This article explores in-depth research on common type mismatch problems in Java generic classes when trying to compare instances of generic classes with their actual type parameters. By analyzing a specific MyGen class example, it is clarified why passing generic class instances directly to methods that expect their type parameters will cause compilation errors, while passing actual type parameter objects is correct. The article proposes the use of method overloading as the core solution, showing how to achieve flexible and type-safe generic object comparison by defining comparison methods for different parameter types, and emphasizes the importance of the relationship between "has-a" and "is-a" in generic design.

Sep 01, 2025 am 04:36 AM

How to use a Map in Java

When using Map, you must first clarify its interface characteristics and commonly used implementations. 1.Map is an interface, and class instantiation needs to be achieved through HashMap, LinkedHashMap, TreeMap, etc.; 2. Common operations include put adding key-value pairs, get getting value, containsKey check keys, remove deleting entries, and size obtaining size; 3. The traversal methods include entrySet, keySet and Java8 forEach; 4. When choosing implementation, HashMap is suitable for unordered and fast access, LinkedHashMap maintains the insertion order, TreeMap implements sorting, and ConcurrentHashMap is used for thread safety; 5. Note that

Sep 01, 2025 am 04:21 AM