Implementing a Kafka Producer Below is a Java-based Kafka producer implementation that sends data to a Kafka topic on a scheduled basis: @Configuration @Slf4j public class ScheduledDataProducer extends Thread { public static final String BROKER_URL = "your_broker_ip:9092"; public static fi...
Generics in Java CollectionsGenerics enable type-safe operations on collections during compilation. A generic class is defined using the syntax:access_modifier class ClassName<GenericType> { }The generic type parameter accepts reference types exclusively; primitive types are not permitted. For...
Implementing a Java program to transpose rows and columns in a two-dimnesional array: Original matrix: 1 2 3 4 5 6 7 8 9 Transposed matrix: 1 4 7 2 5 8 3 6 9 public class MatrixTransposer { public static void main(String[] args) { int[][] matrixData = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; System.out.pr...
Database Schema Setup Create the user table with the following SQL definition: CREATE TABLE `tb_user` ( `id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'Primary Key', `username` varchar(50) NOT NULL COMMENT 'User Name', `age` int(11) NOT NULL COMMENT 'User Age', `ctm` datetime NOT NULL COMMENT 'Creatio...
A production-ready generic utility class for RocketMQ consumer message idempotent deduplication, with no additional configuration overhead beyond basic setup. Core Capabilities Supports using Redis or MySQL as the idempotent record storage layer Flexible deduplication key options: use business prima...
Sorting Squared Elements of a Monotonic Array Given an integer sequence arranged in non-decreasing order, the objective is to generate a new array containing the squares of each element, also sorted in non-decreasing order. Because the original input may contain negative values, squaring them can in...
Dynamic Proxy Implementtaion /** * @author Li Yajie * @date 2024/4/7 10:57 * @description ProxyUtil */ public class ProxyUtil { /** * JDK Dynamic Proxy * * @param target Target object to be proxied * @param <T> * @return */ @SuppressWarnings("unchecked") public static <T> T cre...
Concurrency Theory Why Multithreading is Necessary There are significant speed differences between CPU, memory, and I/O devices. To effectively utilize CPU performance and balance these speed disparities, computer architecture, operating systems, and compilers contribute through: CPU caching to bala...
Handling Form Submission Web applications frequently require data submission from users. In Java-based web development, HTML forms are the primary mechanism for collecting and sending data to the server for processing. Here is an example of a basic HTML form designed to capture a user's credentials:...
Deploying Java Web Start ApplicationsThe Deployment Toolkit script provides the createWebStartLaunchButton function for deploying Java Web Start apps. These applications rely on the Java Network Launch Protocol (JNLP). The function generates an HTML anchor tag (<a>) linking to the JNLP file, r...