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You can evaluate any expression or script in Groovy using the GroovyShell.
The GroovyShell allows you to pass in and out variables via the Binding object.

Code Block
// call groovy expressions from Java code
Binding binding = new Binding();
binding.setVariable("foo", new Integer(2));
GroovyShell shell = new GroovyShell(binding);

Object value = shell.evaluate("println 'Hello World!'; x = 123; return foo * 10");
assert value.equals(new Integer(20));
assert binding.getVariable("x").equals(new Integer(123));

Dynamically loading and running Groovy code inside Java

You can use the GroovyClassLoader to load classes dynamically into a Java program and execute them (or use them) directly. The following Java code shows an example: