first off you question sounds like "how do I do first class functions in java" historically that answer was "make a class with one method, it's shit suck it" things are better now though. But really ...

Compiling Java code to WebAssembly is an efficient way to get it running in a web browser, and you get a serious performance boost. Let's check it out. WebAssembly, or Wasm, provides a generalized, ...