Java Program to Convert Octal to Decimal

This is a Java Program to Convert Octal to Decimal.

We make a class with two methods one for input and other for conversion and access this by object of this class. We first take the input as Octal from user. We define a method as convert() to convert the user’s input to Decimal.

Here is the source code of the Java Program to Convert Octal to Decimal. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

  1. import java.util.Scanner;
  2.  class Octal_Decimal 
  3.  {
  4.     Scanner scan;
  5.     int num;
  6.     void getVal() 
  7.      {
  8.                  System.out.println("Octal to Decimal");
  9. 	scan = new Scanner(;
  10. 	System.out.println("\nEnter the number :");
  11. 	num = Integer.parseInt(scan.nextLine(), 8);
  12.       }
  13.     void convert() 
  14.        {
  15. 	String decimal = Integer.toString(num);
  16.                  System.out.println("Decimal Value is : " + decimal);
  17.        }
  18. }
  19. class MainClass 
  20. {
  21.     public static void main(String args[]) 
  22.       {
  23.          Octal_Decimal obj = new Octal_Decimal();
  24.          obj.getVal();
  25.          obj.convert();
  26.       }
  27. }


$ javac
$ java MainClass
Octal to Decimal
Enter the number :
Decimal Value is : 8

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