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Technical Articles

Java

javaTutorial

How to convert a String to all uppercase in Java

To convert a string to uppercase, you need to use the toUpperCase() method of the String class, which returns a new all-caps string without modifying the original string; 1. Use the toUpperCase() method to convert all characters in the string to uppercase, such as "helloworld" to "HELLOWORLD"; 2. The string is immutable, so you must receive the return value to obtain the converted result; 3. toUpperCase() has two forms based on the default locale and specifying Locale. It is recommended to explicitly specify Locale in a cross-system environment (such as Locale.ENGLISH).

Sep 02, 2025 am 05:02 AM

Record SQL parameter binding in JPA query using Spring Boot 3

This article aims to guide developers on how to configure logs to display parameter bindings in SQL queries when using JPA in Spring Boot 3 projects. By adjusting the log level of Hibernate, the actual executed SQL statements and their corresponding parameter values ??can be clearly observed, thereby facilitating debugging and optimizing database operations.

Sep 02, 2025 am 05:00 AM

Resolve installation failure caused by Mylyn dependency conflict when Eclipse updates EGit

When Eclipse updates EGit, installation failure often occurs due to Mylyn component version conflicts. This tutorial will introduce in detail how to identify such dependency conflicts and provide specific steps to solve the problem by uninstalling outdated Mylyn-related plug-ins, ensuring that Eclipse can complete updates smoothly and improve the stability of the development environment.

Sep 02, 2025 am 04:57 AM

Write a loop in Java until the user enters a specific string

This article describes how to create a loop in Java that runs continuously until the user enters a specific string (for example, "quit"). The highlight explains why you cannot use the == operator to compare strings, and how to use the equals() or equalsIgnoreCase() methods to correctly compare strings, thus achieving the termination of the loop.

Sep 02, 2025 am 03:48 AM

Gradle multi-module project dependency configuration guide: Solve subproject dependency problems

This article aims to help developers solve the problem that subproject dependencies cannot be correctly identified in Gradle multi-module projects. Through clear steps and sample code, we explain in detail how to configure the settings.gradle file and how to declare project dependencies in the build.gradle file of the subproject, ensuring that Gradle can correctly build and manage multi-module projects. By following the guidance of this article, developers can avoid common dependency errors and improve build efficiency.

Sep 02, 2025 am 03:33 AM

What is the hashCode() method in Java?

ThehashCode()methodisimportantbecauseitensuresefficientstorageandretrievalofobjectsinhash-basedcollectionslikeHashMapandHashSet;bydefault,itreturnsanintegerbasedontheobject’smemoryaddress,butitshouldbeoverriddenwheneverequals()isoverriddentomaintainc

Sep 02, 2025 am 03:18 AM

What is the difference between == and equals() in Java?

==Compare the reference address, equals() compares the content; == Used to determine whether two references point to the same object or compare the basic type values, while equals() is used to judge the logical equals of the object. If the string content is the same, it returns true. However, it should be noted that the String class has rewritten the equals() method, and null pointer exceptions should be avoided during comparison. Custom classes need to rewritten the equals() and hashCode() methods to achieve correct comparison.

Sep 02, 2025 am 02:25 AM

What is an Iterator in Java?

AnIteratorinJavaisaninterfacethatenablessequentialtraversalofacollectionwhileprovidingsafeelementremoval.Itispartofthejava.utilpackageandofferskeymethods:1.hasNext()–returnstrueifmoreelementsexist;2.next()–returnsthenextelement;3.remove()–removesthel

Sep 02, 2025 am 02:23 AM

What are functional interfaces in Java?

FunctionalinterfacesinJavaareinterfaceswithexactlyoneabstractmethod,servingasthefoundationforlambdaexpressionsandmethodreferences,enablingfunctionalprogrammingfeatures;theycanincludedefault,static,andObjectclassmethodswithoutbreakingthesingle-abstrac

Sep 02, 2025 am 02:07 AM

java functional interface

How do you search for an element in an array in Java?

The best way to search for array elements in Java depends on whether the array is sorted and its performance requirements: for small unsorted arrays, use linear search (time complexity O(n)); for sorted arrays, use Arrays.binarySearch() (time complexity O(logn)); if you use object arrays and pursue simplicity, you can convert to List and call contains() or indexOf(); when you prefer functional style in Java 8, you can use Arrays.stream().anyMatch() to implement a simple line of code, but the performance is slightly lower than that of traditional loops, so choosing methods requires weighing performance, readability and whether the data is sorted.

Sep 02, 2025 am 02:03 AM

java array

Using Java Enums for More Than Just Constants

Javaenumsarepowerful,full-featuredclassesthatcanhavemethods,constructors,fields,andimplementinterfaces,makingthemidealformorethanjustconstants.1.Enumscanencapsulatebehaviorviamethodoverriding,asseenintheOperationenumwhereeachconstantimplementsapply()

Sep 02, 2025 am 01:49 AM

what is the try-with-resources statement in java

Use the try-with-resources statement to automatically close the resources that implement the AutoCloseable interface to avoid resource leakage; it declares the resources in brackets after the try, ensuring that the resources will be automatically closed regardless of whether an exception occurs, thus replacing the traditional way of manually closing resources in finally blocks; this mechanism supports multiple resource management, and can still correctly close the resources in exceptions, and prioritizes throwing exceptions in the try blocks, and allows suppressed closing exceptions to be obtained through the getSuppressed() method. It is recommended to use this structure when handling resources such as files, database connections, or network flows that need to be explicitly closed, to improve the security and readability of the code.

Sep 02, 2025 am 12:27 AM

Implementation of complex sorting logic in Java: Multi-condition Comparator Design Guide

This article explores in-depth ways to implement complex sorting logic in Java, especially when ordering the object list based on multiple, prioritized conditions such as specific type order and alphabetical order. By introducing two strategies for defining priority and Map-based using enumerations, combined with Comparator chain calls, we aim to provide clear, maintainable and efficient solutions to help developers deal with multi-dimensional sorting challenges.

Sep 01, 2025 am 11:39 AM

Tutorial on Generating Dynamic Character Patterns Based on User Input in Java

This tutorial details how to dynamically generate specific character patterns in Java based on the number of lines entered by the user. By cleverly using nested loops and modulo operators, we can alternately output different characters (such as '' and '-') according to the parity of the number of lines, and ensure that the number of characters per line is consistent with the line number, thereby efficiently realizing the printing of patterns.

Sep 01, 2025 am 11:18 AM