Java 八进制转十进制的程序

public class DecimalOctal {
    public static void main(String[] args) {
        int decimal = 78;
        int octal = convertDecimalToOctal(decimal);
        System.out.printf("%d in decimal = %d in octal", decimal, octal);
    }
    public static int convertDecimalToOctal(int decimal)
    {
        int octalNumber = 0, i = 1;
        while (decimal != 0)
        {
            octalNumber += (decimal % 8) * i;
            decimal /= 8;
            i *= 10;
        }
        return octalNumber;
    }
}

78 in decimal = 116 in octal

8 | 78
8 | 9--6
8 | 1--1
8 | 0--1
(116)

public class OctalDecimal {
    public static void main(String[] args) {
        int octal = 116;
        int decimal = convertOctalToDecimal(octal);
        System.out.printf("%d in octal = %d in decimal", octal, decimal);
    }
    public static int convertOctalToDecimal(int octal)
    {
        int decimalNumber = 0, i = 0;
        while(octal != 0)
        {
            decimalNumber += (octal % 10) * Math.pow(8, i);
            ++i;
            octal/=10;
        }
        return decimalNumber;
    }
}

116 in octal = 78 in decimal

1 * 82 + 1 * 81 + 6 * 80 = 78