How to compile java files in idea?

Question

Java

Hello, there is one project of a very complex structure. This is not a java project, but java is used in it. There are some java classes that need to be modified and compiled. There is an iml file, which, as I understand it, contains all the necessary information for compilation (dependencies, output directory ). Tell me, is it possible to compile the java file I need in idea?
now the compile button is not available.

Answer 1

iml - project format for idea. Try to open idea and make open project.
If it doesn't work, you can just compile the .java files with the usual javac - java compiler from jdk and get .class files