Argument contain numbers only

Hey,
In my plugin, I am trying to make a command that only accepts numbers as an input. For example, it would be like /bdropparty 12 or /bdropparty 125

Here is my current code.

Code:java

            if(cmd.getName().equalsIgnoreCase("bdropparty"))
                if(args.length == 0){
                    player.sendMessage("§8[§9StradLand§8] §6Usage: §c /bdropparty <numberofplayers>");
                        }else if(args.length >= 1){
                            String message = "";
                            for (String part : args) {
                                if (message != "") message += " ";
                                message += part;

 

Code:java

    try {
        Integer.parseInt(args[1]);
        //number
    } catch(NumberFormatException e) {
        //not number
    }

 

Code:

try
{
Integer.parseInt(String);
}
catch (Exception e)
{
// If not an integer
}