Elasticsearch aggregations enable powerful data summarization over search results. Among the four main aggregation types—metric, bucket, matrix, and pipeline—metric aggregations compute numeric statistics from document fields. Average Aggregation Computes the arithmetic mean of a numeric field. For...
ArrayList is a resizable array implementation of the List interface. It maintains insertion order, allows null and duplicate elements, and provides fast random access. However, its not thread-safe. Insertions and deletions in the middle of the list require shifting elements, making these operations...
The java.util.concurrent package, introduced in Java 5, is the foundation for building high-performance, scalable, and responsive multithreaded applications. This library abstracts low-level synchronization complexities into robust, production-ready utilities. Task Execution with Executors The Execu...
Installing JDK on Linux: Two Different Approaches Environment with Internet Access Using YUM to Install Search for Java-related packages 1 yum -y list java* Alternatively, 1 yum search jdk Install the JDK package 1 yum install java-1.8.0-openjdk.x86_64 Verify the installation 1 java -version The def...
Java Annotations Overview What Are Annotations? Annotations in Java serve as metadata markers that can be applied to classes, fields, methods, and other program elements. They provide additional information about these elements without affecting the actual code execution. Modern Java frameworks rely...
Thread-based concurrency requires careful coordination when multiple threads share access to common resources. The producer-consumer pattern addresses this challenge by decoupling data generation from data processing through an intermediate buffer.Core Implementation with BlockingQueueJava's java.ut...
Create a new Java project and configure the basic project structure. Add the required dependencies: <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.3.15.RELEASE</version> </depende...
Avoid Auto-boxing/Unboxing Operations Bad Practice: This approach can lead to hard-to-trace NPEs // Anti-pattern public static int process(Integer value) { return value; // Potential NPE during unboxing } Good Practice: Maintain consistent parameter types // Recommended approach public static Integ...
TCP Socket Interaction and the Read Operation After a TCP connection is established via the three-way handshake, data transmission begins. For the server, once accept() completes, the socket is ready and the process typically calls read(). This read() call is blocking, meaning the server process wil...
Object Serialization and Deserialization Writing objects to a stream using ObjectOutputStream is called serialization. Reading objects from a stream using ObjectInputStream is called deserialization. Creating a Serializable Class To serialize an object, the class must implement the Serializable inte...