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String version = Bukkit.getVersion();
String[] splitv = version.split(":");
version = splitv[1].replace(")","").replace(" ", "");

String[] checkup = version.split("\\.");
List<String> versions = new ArrayList<String>();

for(int i = 16; i <= 18; i++){
    versions.add(String.valueOf(i));
}

for (String list:versions) {
    if(!list.equalsIgnoreCase(checkup[1])) getLogger().log(Level.SEVERE, "Die Version des Servers passt nicht");
    else this.Version = checkup[1];
}