What is the difference between a Groovy script and a Groovy class?

A Groovy script is a sequence of statements in a .groovy file that Groovy implicitly wraps in a generated class, extending groovy.lang.Script, at compile time, letting you write top-level executable code without explicitly declaring a class or a main method yourself.

A Groovy class, written explicitly with the class keyword, behaves like a normal class - instantiable, with its own methods and fields - and doesn't get this implicit script-wrapping behavior; it needs to be instantiated and used like any Java class would be.

Because a script is really just sugar over a generated class, you can freely mix top-level script statements with explicit class definitions in the same file, and the script's own code effectively becomes that generated class's run() method under the hood.

Invest now in Acorns!!! 🚀
Join Acorns and get your $5 bonus!

Acorns is a micro-investing app that automatically invests your "spare change" from daily purchases into diversified, expert-built portfolios of ETFs. It is designed for beginners, allowing you to start investing with as little as $5. The service automates saving and investing. Disclosure: I may receive a referral bonus.

Invest now!!! Get Free equity stock (US, UK only)!

Use Robinhood app to invest in stocks. It is safe and secure. Use the Referral link to claim your free stock when you sign up!.

The Robinhood app makes it easy to trade stocks, crypto and more.

Webull! Receive free stock by signing up using the link: Webull signup.