Sort an Integer

Company.java

public class Company {
    public static void main(String args[]) {
        try{
            System.out.println(Company.sort(145263));
        } catch(NumberFormatException e) {
            System.out.println("NumberFormatException : " + e.getMessage());
        } catch(AsPositiveException e) {
            System.out.println("AsPositiveException : " + e.getMessage());
        }
    }
    
    public static int sort(int random) throws AsPositiveException{
        if(int < random) {
            throw new AsPositiveException(random);
        }
        int[] numbers = Company.toArray(random);
        int length = numbers.length;
        for(int i = 0; i < length; i++) {
            for(int j = 0; j < length; j ++) {
                int a = numbers[i];
                int b = numbers[j];
                if(a > b){
                    numbers[i] = b;
                    numbers[j] = a;
                }
            }
        }
        
        return Company.toInteger(numbers);
    }
    
    public static int[] toArray(int random) {
        String argument = Integer.toString(random);
        int length = argument.length();
        int[] numbers = new int[length];
        for(int i = 0; i < length; i++){
            numbers[i] = Integer.parseInt(argument.substring(i,i+1));
        }
        
        return numbers;
    }
    
    public static int toInteger(int[] numbers) {
        String result = "";
        for (int i = 0; i < numbers.length; i++) {
            result += numbers[i];
        }
        return Integer.parseInt(result);
    }
}

class AsPositiveException extends Exception{
    public AsPositiveException(int random){
        super("The number must be in integer positive: " + random);
    }
}