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Spoon is an open-source library for the Java programming language. The framework lets developers write, and modify object-oriented applications (such as games or simulations) during execution. Spoon works by transforming a program into an abstract syntax tree (AST) and then applying user-defined manipulations before reassembling the AST back into executable code. This means that developers can use Spoon to enhance existing software without changing its source code directly. In addition, it enables large-scale analysis of source code repositories and automates tasks such as refactoring or enforcing coding standards in a consistent manner across projects. As of 2022, Spoon continues to be used within the JVM ecosystem by organizations like INRIA and has influenced similar tools in languages outside of Java's domain.

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