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Java text file stop word removal and word frequency statistics tutorial

This article details how to implement the stop word removal and word frequency statistics functions of text files in Java. The tutorial covers file reading, construction of stop word lists, text cleaning (including case conversion and punctuation processing), efficient word segmentation removal, and the complete process of using HashMap for word frequency statistics and sorting to output Top N high-frequency words.

Sep 06, 2025 am 06:09 AM

Verify Executor internal method calls using Mockito

This article describes how to verify methods called inside the Executor.execute() method when using Mockito for unit testing. Because Executors usually perform tasks asynchronously, direct verification may fail. This article provides a solution to force synchronization execution using SynchronousExecutor, simplifying testing and ensuring method calls can be validated correctly.

Sep 06, 2025 am 05:57 AM

Find objects in ArrayList in Java

This article aims to guide developers how to find specific objects based on their attribute values ??in Java's ArrayList. The contains() method of ArrayList can only find exactly matching objects by default, and cannot be directly searched through some properties of the object. This article will introduce how to implement object search based on attribute values ??by looping through and overwriting the equals() method, and provide sample code and precautions.

Sep 06, 2025 am 05:48 AM

Logback log control: Disable console output while retaining file records

This article aims to solve the problem that Logback still outputs to the console when the ConsoleAppender is not explicitly configured. We will explore Logback's log additionity mechanism in depth, and use specific Java code examples to demonstrate how to accurately control the propagation of log events by setting logger.setAdditive(false), so as to only write logs to the specified file and stop unnecessary console output.

Sep 06, 2025 am 05:18 AM

How to get file metadata in Java?

To obtain Java file metadata, you should use the Files class and BasicFileAttributes interface in the java.nio.file package; 1. Use Files.readAttributes(path, BasicFileAttributes.class) to obtain basic properties, such as file size, creation time, last modification time, access time, whether it is a directory or a normal file; 2. If disk-level information is required, you can obtain the FileStore object through Files.getFileStore(path), and then obtain the total space, available space, unallocated space and whether it supports specific attribute views; 3. For specific platform meta-platforms

Sep 06, 2025 am 05:07 AM

java File metadata

MySQL multi-level association table cascade deletion strategy: Resolving foreign key constraint conflicts

This article discusses the foreign key constraint conflicts encountered when handling cascading deletion of multi-level associated tables in MySQL databases. By analyzing the structure of grandparents and grandchild tables such as scenario -> event -> plan, the cause of SQLIntegrityConstraintViolationException is explained in detail, and a solution is provided to effectively realize data cascading deletion by configuring foreign key constraint behaviors such as ON DELETE CASCADE. The article also covers the limitations of external PA entity mapping, other cascading options, and temporary database hierarchical cascading deletion policies.

Sep 06, 2025 am 05:03 AM

How do you synchronize threads in Java?

Javaprovidesseveralmechanismsforthreadsynchronizationtoensuredataconsistencyandpreventraceconditions:thesynchronizedkeyword(formethodsandblocks),ReentrantLockforgreaterflexibility,atomicvariableslikeAtomicIntegerforlock-freeoperations,andhigher-level

Sep 06, 2025 am 04:42 AM

java Thread synchronization

How to create and start a thread in Java by extending the Thread class

To create and start a thread by inheriting the Thread class, you need to define the class to inherit Thread and overwrite the run() method, then create an instance and call the start() method; 1. Create a class that inherits Thread, overwrite the run() method, which contains the code executed by the thread; 2. Instance the class and call the start() method to start the thread, so that run() can be executed in a new thread; note that run() cannot be called directly, and each thread object can only call start() once. It is recommended to use the Runnable interface to avoid inheritance restrictions, but inheriting Thread is suitable for simple scenarios or learning purposes.

Sep 06, 2025 am 04:41 AM

Load Testing and Stress Testing Java Applications

Loadtestingevaluatessystemperformanceunderexpectedloads,whilestresstestingpushesthesystembeyonditslimitstoobservefailureandrecovery.1.ForloadtestingJavaapps,definerealisticuserscenariosusingtoolslikeJMeter,Gatling,ork6.2.Simulateconcurrentusers,monit

Sep 06, 2025 am 04:24 AM

java Performance Testing

Infinite Series Summarization: Tutorial on Solving Fractional Equations in Interval

This article aims to guide readers on how to calculate the sum of infinite fraction equations within a specified interval. By analyzing the code in the problem, pointing out the existing problems, and providing an improved code example. The improved code can more accurately calculate the sum of series within a given interval, and explain in detail the implementation logic and key steps of the code, helping readers understand the principles and methods of summing infinite series.

Sep 06, 2025 am 04:21 AM

What is the difference between an array and an ArrayList in Java?

ThemaindifferencebetweenanarrayandanArrayListinJavaisthatarrayshaveafixedsizewhileArrayListsaredynamicandcangroworshrinkautomatically;arrayscanstorebothprimitivesandobjects,whereasArrayListscanonlystoreobjects,requiringwrapperclassesforprimitives;arr

Sep 06, 2025 am 04:16 AM

How to add or subtract days from a date in Java

UseLocalDatefordate-onlyoperations,LocalDateTimefordateandtime,andZonedDateTimefortimezones;2.AdddayswithplusDays()andsubtractwithminusDays();3.Thesemethodsreturnnewinstancessincejava.timeobjectsareimmutable;4.Chainoperationsaresupported,suchasplusDa

Sep 06, 2025 am 03:46 AM

java date calculation

How to handle POST requests in Java with Spring Boot

AddSpringWebdependencyinpom.xmlforhandlingHTTPrequests.2.CreateamodelclasslikeUserwithfields,constructors,andgetters/setters.3.Use@RestControllerand@PostMappingtodefineanendpointthatacceptsPOSTrequests.4.Use@RequestBodytobindJSONdatatothemodelobjecta

Sep 06, 2025 am 03:04 AM

What is the purpose of the hashCode() method in Java?

ThehashCode()methodinJavageneratesanintegervalueusedbyhash-basedcollectionslikeHashMapandHashSettoefficientlystoreandretrieveobjectsbydeterminingthebucketlocation;itmustbeoverriddenalongsideequals()toensurethatequalobjectsproducethesamehashcode,maint

Sep 06, 2025 am 02:40 AM

java hashcode