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Arithmetic Operators Operator Description + - * / % Basic math ++ -- Pre- and post-increment/decrement + (unary) Keep sign - (unary) Negate Prefix vs. Postfix int a = 5; int b = ++a; // a=6, b=6 int c = a++; // c=6, a=7 String Concatenation String s = "score:" + 100; // "score:100" Assignment Operators + ...

Understanding Mock Testing Mock testing serves as a development technique where real objects are substituted with simulated versions to facilitate testing. This approach proves valuable when dealing with components that require complex initialization or external dependencies. Consider objects like HttpServletRequest requiring servlet container ...

Implementing Data Masking In modern application development, protecting personally identifiable information (PII) is a critical requirement. A clean way to handle this in a Spring Boot environment is by leveraging custom Jackson annotations. This approach allows us to mask data during the JSON serialization process without adding heavy third-pa ...

Core Architecture Overview The self-preservation mechanism in Eureka Server is designed to handle network instability and prevent healthy services from being prematurely removed during communication failures. Mechanism Behavior Eureka Server continuously monitors heartbeat success rates over 15-minute intervals. If the failure rate exceeds 15% ...

System Architeecture Backend Technology Stack The system utilizes Spring Boot as the core backend framework, which follows the convention-over-configuration principle to minimize XML configuration overhead. Spring Boot automatical configures components based on project dependencies, allowing developers to focus on business logic implementation. ...

Core Terminology Aspect: A modularized concern (e.g., audit logging) implemented via @Aspect-annotated classes or XML configuration. Join Point: A specific point in execution—most commonly a method invocation—where advice can be applied. Advice: Code executed at a join point. Spring supports @Before, @AfterReturning, @AfterThrowing, @After, an ...

Generic Class Declaration A generic class introduces one or more type parameters within angle brackets. For example: public class Range<T> { private T lower; private T upper; public Range(T low, T high) { this.lower = low; this.upper = high; } } Instantiation binds T to a concrete type at compile time: Ra ...

Proxy Design Pattern Overview The Proxy pattern provides controlled access to objects by creating intermediaries. This allows pre/post-procesing operations on target objects. <code class="java"> public interface FinancialService { void executeTransaction(String id, double amount); } public class BankService implements Finan ...

Spring Boot provides a lightweight mechanism for scheduling tasks using the @Scheduled annotation, eliminating the need for external libraries like Quartz in many use cases. This built-in feature allows developers to configure recurring jobs directly through method-level annotations. Understanding the @Scheduled Annotation The @Scheduled annota ...

A linked list is a fundamental data structure that represents a sequence of elements connected through nodes. Each node contains data and a reference (or pointer) to the next node in the sequence. Linked lists come in various forms, including singly linked lists, doubly linked lists, sorted linked lists, and circular linked lists. This article ...