How do you exchange data between a host Java application and an embedded BeanShell script?

The host application passes data into the script's namespace using the Interpreter's set() method, making a Java object or primitive value available under a chosen variable name for the script to read or modify.

After the script runs, via eval() or source(), the host application retrieves any resulting data using the Interpreter's get() method, pulling a variable's current value back out of the script's namespace into Java code.

Because the objects passed via set() are real Java object references, not copies, a script that calls methods on a passed-in mutable object can affect that same object as seen by the host application afterward, which is a common, deliberate pattern for letting a script modify shared state rather than only returning a value through eval()'s return value.

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.