Solved Save to config.yml

Hello,
if I repeat a subject, I apologize, but I did not find anything on the forum.
I have config.yml and when a player will use the command /save to config.yml to write to the file "save".
I want get config and add "save"

Code:

FileConfiguration config = main.getConfig();
config.set("check.player.save", "save");
  try {
     config.save(main.getDataFolder()+"/config.yml");
  } catch (IOException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
  }

And this work, but turns Polish characters into squares and does not save values that are empty and mixes the ruler.
Can you fix it?

Code:

I have:
key1:
key2:
key3: ąćężź
check:
  player:
    save:
key4: Lorem IpsumLorem IpsumLorem IpsumLorem IpsumLorem IpsumLorem IpsumLorem Ipsum

Code:

I want:
key1:
key2:
key3: ąćężź
check:
  player:
    save: save
key4: Lorem IpsumLorem IpsumLorem IpsumLorem IpsumLorem IpsumLorem IpsumLorem Ipsum

Code:

I receive
key3: ∆∆∆∆
check:
  player:
    save: save
key4: Lorem IpsumLorem IpsumLorem IpsumLorem IpsumLorem {<<<---moved ruler to down}
IpsumLorem IpsumLorem Ipsum

PS utf-8 is in config.yml but when i make this code it doesn't work

 

File save is not appropriate.

Use this:
Main.java:

Code:

FileConfiguration config = getConfig();
File config_file = new File(getDataFolder(), "config.yml");

public void createFile() {
    try {
        if (config_file.exists()) {
            config = YamlConfiguration.loadConfiguration(config_file);
    } catch (IOException e) {
        e.printStackTrace();
        }
}

Other class:

Code:

main.config.set("check.player.save", "save");
  try {
     main.config.save(main.config_file);
  } catch (IOException e) {
     e.printStackTrace();
  }

For Polish characters, use the replaceAll("<value>", "$") code in your code.

 

Nothing helped.
Next cuts off the keys that have no value.
folded keys e.g.
changes from:

Code:

key1:
  key2:
    key3:

on:

Code:

key1: {}

 

Okay, but why this change

Code:

Key1: value1
  Key2:value2
    Key3:value3

On:
Key1: {}

 

Okay, thank you very much for help. it will take some time before I make one better plugin
Problem solved!
Solution:
https://bukkit.org/threads/tutorial-using-config-yml.266968/
This is only one good tutorial.