[json-lib-user] Serializing "[]", "[12345]" problem

[<sc...@gm...>]

Hi all~

I'm using json-lib 1.1 jdk13 version.
I don't know why json-lib serializes "[]" or "[12345]" string to array type.

test code :

public class JsonTest {
    public static void main(String[] args) throws Exception
    {
        Test t = new Test();
        t.setNickname("[12345]");
        JSONObject obj = JSONObject.fromBean(t);
        System.out.println(obj.toString());
    }

    public static class Test {
        private String nickname;

        public String getNickname() {
            return nickname;
        }

        public void setNickname(String name) {
            this.nickname = name;
        }
    }
}

the result is :
{"nickname":[12345]}

I expected that  {"nickname":"[12345]"}  would be printed.

Is there anyone who knows the reason?