Is this code block in Java, with the default mode? (On module blocks it targets the file header)

Property definitions

nitc :: java $ AExternCodeBlock :: is_default_java
	# Is this code block in Java, with the default mode? (On module blocks it targets the file header)
	private fun is_default_java: Bool do return language_name != null and
		language_name_lowered == "java"
src/ffi/java.nit:386,2--388,33