8进制转为10进制(java)

package acm;

import java.util.Scanner;

public class L3_2 {

/**   * @param args   */

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner scan=new Scanner(System.in);

int a[]=new int[1000];

int n=scan.nextInt();

int i=0;

int sum=0;

while(n>0){

a[i]=n%10;

n=n/10;

sum=(int) (sum+a[i]*Math.pow(8, i));

i++;

}

System.out.println(sum);

}

}