Is it possible to execute code from String during runtime?

Question

I've been experimenting with a tiny kludge of a Dungeons and Dragons combat emulator in Java. It's primarily to allow me to test out my new knowledge, and one way I encourage myself to learn is to push at what I already know. Hence my question: is there a way to execute code input by the user, during runtime? An example -

During an encounter, the user add an extra line to the 'Behaviour' Array of Strings (via a Scanner, most likely). They add:

 "for(Monster m : Room) if(m.getHP()>10) adventurer.attack(m);"

During their 'turn' the program iterates through each String in 'Behaviour', executing the above line of code.

Is something like this possible? Where should I look if it isn't?

Answer 1

Yes that is possible. In fact we can do pretty much everything by programming.

You can use BeanShell for that purpose.