Decimal a Octal en Java

import javax.swing.JOptionPane;

 

 

 

public class DecimalAOctal {

     

    public static void main(String[] args) {

                 

        String strDecimal = JOptionPane.showInputDialog(null, "Introduce un número decimal: ",

                "Decimal a Octal", JOptionPane.QUESTION_MESSAGE);

        int decimal = Integer.parseInt(strDecimal);

         

        System.out.println("Decimal a Octal");

         

        // 1º método con toOctalString

        String octal = Integer.toOctalString(decimal);

        System.out.printf("%nMétodo 1 -> Decimal: %d, Octal: %s", decimal, octal);

         

        // 2º método con array

        char digitosO[]={'0','1','2','3','4','5','6','7'};

        String octal2 = "";

        int resto, aux = decimal;

         

        while(aux>0){

            resto = aux % 8;

            octal2 = digitosO[resto] + octal2;

            aux /= 8;

        }

        System.out.printf("%n%nMétodo 2 -> Decimal: %d, Octal: %s", decimal, octal2);       

    }

}