It is nothing like the real Java. Almost no regular data type is supported and there are severe limitations. [1] You should view it as using a safe language in

It is nothing like the real Java. Almost no regular data type is supported and there are severe limitations. [1] You should view it as using a safe language instead of something like C. If Rust had been invented 20 years ago, it might have been Rust instead. [1] https://en.wikipedia.org/wiki/Java_Card https://en.wikipedia.org/wiki/Java_Card