What language do they build other languages with?

Question

What language is used to build low level languages like c++ and java?

How could you build the first language with no language?

Answer 1

there are a couple options, you can implement the entire language in a language available on the target host, like C or Ocaml, whatever it may be. Once you have that implementation, you can write a compiler / interpreter in the language itself, build it, and now the language runs itself. this process is called 'bootstrapping'.