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Java naked Socket implements SMTP email sending: Detailed explanation of authentication mechanism and EHLO protocol application

This tutorial explores in-depth how to correctly handle authentication issues when using naked Socket to implement SMTP mail sending in Java. It reveals that the "530 5.5.1 Authentication Required" error is not a TLS/SSL issue, but a lack of user authentication. The article introduces the EHLO command and AUTH PLAIN authentication mechanism in the SMTP Extended Protocol (ESMTP), and provides complete Java code examples to guide developers to build an email client with authentication capabilities.

Aug 27, 2025 am 08:15 AM

Java text processing: efficiently remove stop words and word frequency statistics

This tutorial is intended to guide readers how to use Java to efficiently remove specified stop words from text files and further count the frequency of occurrence of each vocabulary in the text after cleaning. By combining Java NIO.2 file operation, string processing and collection framework, we will build a robust solution to implement preprocessing and basic analysis of text data.

Aug 27, 2025 am 06:57 AM

Detailed explanation of the differences between Math.pow() and multiplication operations and operator priority in Java

This article aims to explain the differences between the Math.pow() function and the multiplication operator in Java in terms of calculation results, and to explore in-depth the priority rules of Java operators. By dissecting a specific code example, the impact of operator priority on the calculation results is detailed, and practical suggestions are provided to avoid such problems.

Aug 27, 2025 am 06:36 AM

Effective strategies for managing unique elements in Java arrays

This article explores how to efficiently and correctly check and avoid duplicates when adding elements to a fixed-size array of strings in Java. The article analyzes the common NullPointerException issues when arrays are initialized to empty in detail, and provides a robust solution to iterate over the filled parts for repeated checks and safely add elements after confirming that there is no duplication, while taking into account the optimization strategy of array capacity limitation and early exit.

Aug 27, 2025 am 05:54 AM

How to use the super keyword in Java

super()isusedtocalltheparentclassconstructorandmustbethefirststatementinasubclassconstructor;iftheparenthasnono-argconstructor,callingsuperwithappropriateargumentsismandatory.2.super.methodName()allowsaccesstooverriddenparentmethods,enablingextension

Aug 27, 2025 am 05:49 AM

How to base64 encode a string in Java

Tobase64encodeastringinJava,useBase64.getEncoder().encodeToString(input.getBytes(StandardCharsets.UTF8))forstandardencoding;2.AlwaysspecifyUTF-8explicitlytoensureconsistentbehavioracrossplatforms;3.UseBase64.getUrlEncoder()forURL-safeencoding,whichre

Aug 27, 2025 am 05:05 AM

java base64 encoding

Effective Java Design Patterns for Enterprise Applications

Singletonensuresoneinstanceviaglobalaccess,bestwithenumsforthreadsafety,butpreferDIovermanualimplementation;2.FactoryandAbstractFactoryenableflexibleobjectcreationandruntimeswitching,idealfordatabasesorUItoolkits;3.Builderconstructscomplexobjectsstep

Aug 27, 2025 am 04:51 AM

Experience Java 19 preview and incubation features with Gradle

This article aims to guide developers on how to enable Java 19 preview features (such as virtual threads) and incubation features (such as structured concurrency) in Gradle projects. By configuring the build.gradle file, you can easily pass compile and run parameters to the Java compiler and JVM, allowing you to experience the new features of Java 19 in a Gradle environment. This article provides a complete configuration example to help you get started quickly.

Aug 27, 2025 am 04:24 AM

How to find the max or min value in a Stream in Java

Use the max() and min() methods to combine Comparator to find the maximum and minimum values ??in the stream, such as Comparator.naturalOrder() or Integer::compareTo compare basic types; 2. For custom objects, use Comparator.comparing() to compare based on specific fields, such as Person::getAge; 3. Since the result is Optional, the empty stream situation must be handled. You can use isPresent() to check or orElse() to provide default values. It is recommended to use IntStream for basic types to avoid boxing overhead and improve performance. In the end, you should always be properly done.

Aug 27, 2025 am 04:14 AM

java stream

What is the difference between sleep() and wait() in Java?

sleep()belongstoThreadclassandoperatesonthecurrentthread,whilewait()belongstoObjectclassandiscalledonanobjecttoaffectthethreadholdingitsmonitor.2.sleep()doesnotreleaseanylocksduringpause,whereaswait()releasestheobject’slockandmustbecalledwithinasynch

Aug 27, 2025 am 03:38 AM

java

Android Room database pre-filled data failure troubleshooting and solutions

This tutorial is intended to solve the problem that pre-populated data in Android Room databases does not appear. The core reason is that the onCreate method in RoomDatabase.Callback is only executed once the database is first created. If the application has been run before the pre-filling logic is added or repaired, or there is a problem during the first execution, subsequent runs will not trigger data filling again. This mechanism will be explained in detail in the article and provides an effective solution to retrieve database creation by uninstalling the application, ensuring that pre-filled data is loaded correctly.

Aug 27, 2025 am 03:33 AM