Metaprogramming - TechnoScripts

Groovy ExpandoMetaClass – Add Methods at Runtime with 10+ Examples

Groovy ExpandoMetaClass lets you add instance methods, static methods, constructors, and operators to any class at runtime. 10+ tested examples included. “ExpandoMetaClass is Groovy’s answer to open classes. If you wish a Java class had a method, just add it.” Guillaume Laforge, Groovy Project Lead Last Updated: March 2026 | Tested on: Groovy 5.x, Java 17+ | Difficulty: Intermediate to Advanced | Reading Time: 18 minutes Ever wished String had a method to check for palindromes, or that Integer could ... Read More

Groovy Categories and Mixins – Extend Existing Classes with 10+ Examples

Learn Groovy categories and mixins with 10+ tested examples. Add scoped methods to classes, compose behaviors, and extend JDK classes safely. “Categories let you try on new methods like clothes – wear them when you need them, take them off when you’re done.” Dave Thomas, The Pragmatic Programmer Last Updated: March 2026 | Tested on: Groovy 5.x, Java 17+ | Difficulty: Intermediate | Reading Time: 18 minutes Adding methods globally with ExpandoMetaClass is powerful but permanent (until cleanup). What if ... Read More

Groovy Metaprogramming – Runtime Magic Explained with 10+ Examples

Groovy metaprogramming capabilities are explored here with 10+ tested examples. Learn runtime method injection, missing method handling, dynamic properties, and more on Groovy 5.x. “Metaprogramming is the art of writing code that writes code. In Groovy, it’s not art – it’s everyday life.” Venkat Subramaniam, Programming Groovy 2 Last Updated: March 2026 | Tested on: Groovy 5.x, Java 17+ | Difficulty: Intermediate to Advanced | Reading Time: 18 minutes If you’ve spent any time with Groovy, you’ve already used groovy ... Read More