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);

 }

}