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Refined an earlier utility class for exporting data to Excel format. Key Features: Supports header generation directly from class fields Data list accepts List<custom objects/primitive types/String> Utility uses varargs for flexible input handling Non-custom objects support nested lists like List<List<String>>, future enhance ...

Implementing dynamic sorting in Entity Framework requires runtime expression construction. Here are two distinct patterns to handle property-based ordering without compile-time type knowledge. Pattern 1: Generic Expression Builder with Type Constraints This factory method creates strongly-typed ordering expressions but demands prior knowledge o ...

In C# development, you often encounter square brackets applied to classes, methods, and other code elements. These are known as Attributes, which provide a powerful mechanism for adding metadata to your code. This article explores how to create and use custom attributes in C#. What Are Attributes? Attributes are classes that allow you to add de ...

Exception Handling Strategies Effective error management requires a clear boundary between infrastructure logic and user interaction. Exceptions should generally be caught at the upper layers to ensure appropriate user feedback, while lower layers should propagate errors rather than suppressing them. Swallowing exceptions hides critical failure ...

Many Java developers encounter reflection during their learning journey but often leave with only a vague understanding—or skip it entirely. This article demystifies what reflection is, how it works under the hood, and where it’s practically applied in real-world systems. What Is Reflection? According to Wikipedia, reflective programming refers ...

JDK dynamic proxies provide a mechanism to create proxy instances that implement specified interfaces at runtime. Here's a basic implementation: import java.lang.reflect.*; interface GreetingService { void greet(); } class GreetingServiceImpl implements GreetingService { public void greet() { System.out.println("Hello fr ...

Effective exploitation via Java deserialization often hinges on bypassing access controls and instantiating objects without invoking standard constructors. The ysoserial toolkit addresses these challenges through specialized utility classes, primarily located in the payloads.util package. Two critical components facilitate these operations: Ref ...

Retrieving the last entrry of a LinkedHashMap using reflection LinkedHashMap<String, String> data = new LinkedHashMap<>(); data.put("a", "apple"); data.put("b", "banana"); try { var field = data.getClass().getDeclaredField("tail"); field.setAccessible(true); Map.Entry&lt ...

Reflection in Go provides runtime access to type information and value manipulation, but it comes with performance and safety trade-offs. This article explores the core concepts of reflection—reflect.Type, reflect.Value, and Kind—and demonstrates practical applications with slices, maps, structs, pointers, and functions. Core Concepts: Type, Va ...

Retrieving Class Objects There are three primary ways to obtain a Class instance at runtime: 1. Class<?> clazz = Class.forName("java.util.ArrayList"); 2. String text = "example"; Class<?> clazz = text.getClass(); 3. Class<?> clazz = Integer.class; // Note the lowercase 'class' Inspecting Class Fields ...