Generally, Java compilers are run and pointed to a programmer's code in a text file to produce a class file for use by the JVM on different platforms. Jikes, for example, is an open source compiler ...

In fact, you don’t even have to code your Java into a file. JShell can execute lines of Java code directly on the command line. Java without a main method Historically, Java devs have had to code a ...

To succeed, it needs good tools, good docs, and an active community. The language tools (compiler, etc.) are all open source and written in Fan. The code is clean and surprisingly readable.