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Asked: 2026-05-23T03:43:09+00:00

A friend from college is studing web programming using the tapestry framework, and he

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A friend from college is studing web programming using the tapestry framework, and he asked me if could i help him with his homework.
One of the questions in the homework says:

What is expansion, and how do we use
it?

Its the first time hear about it.

Do you have any idea what is that topic about?

I am kind of confused. Is there any OOP principle with that name?

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1 Answer

  1. Editorial Team

    According to this tutorial it’s basically string interpolation.

    First is the way we display the current date and time: ${currentTime}. This syntax is used to access a property of the page object, a property named currentTime. Tapestry calls this an expansion. The value inside the braces is the name of a standard JavaBeans property supplied by the page. As we’ll see in later chapters, this is just the tip of the iceberg for what is possible using expansions.

    It’s not an OO term – it’s part of Tapestry.

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