Solved ConfigurationSection to string

FIleConfiguration#getStringList
FileConfiguration#set(List<String>)

 

You can read lines from the file using a BufferedReader

 

u cann use ArrayLists to u Fileconfiguration

example

Code (Text):

        List<String> list = new ArrayList();
        list.add("line1");
        list.add("line2");
        cfg.addDefault("ABC.TEST.COMMAND", list);

 

I think he wants to take the text in the file and print that in chat, not add a list to the file.
Adding to what I mentioned before, here are some examples: https://www.journaldev.com/709/java-read-file-line-by-line

 

but Arraylist on Config is easier or not?

 

No

Loop through your configuration section and getting the values and use a string builder.
I'm gonna post a code later.