Given an Integer (Decimal) number and we have to convert it into Octal using java program.

import java.util.Scanner;

class DecimalToOctalConversionClass{
	public static void main(String[] args){
		//create Scanner object
		Scanner sc = new Scanner(System.in);

		System.out.println("Enter Any Decimal Number :");
		//Accept input from keyboard
		int input_decimal_num = sc.nextInt();
		int octal_num = 0,rem,temp_input_decimal_num,i=1;
		temp_input_decimal_num = input_decimal_num;

		//Loop continues till temp_input_decimal_num to 0
		while(temp_input_decimal_num > 0){
			//Get remainder
			rem = temp_input_decimal_num%8;
			octal_num = octal_num+rem*i;
			temp_input_decimal_num = temp_input_decimal_num/8;
			i=i*10;
		}
		//Display Result 
		System.out.println("Conversion of decimal to octal is : " + octal_num);
	}
}

Output

D:\Java Articles>java DecimalToOctalConversionClass
Enter Any Decimal Number :
222
Conversion of decimal to octal is : 336