十进制转八进制的转换问题 高手请进

import java.util.Scanner;


public class xue {
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
         int[] b ;
         b = new int[8];
        for( int i = 0 ; i < b.length ; i++){
             b[i] = a % 8 ;
             a = a / 8 ;
        
        System.out.println(b[i]);}
}

                 
}
这个程序错在哪儿？？

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import java.util.Scanner;

public class Xue {
   
     public static void main(String[] args){
         
            Scanner in = new Scanner(System.in);
            
            int a = in.nextInt();
            
            int[] b = new int[8];
            
            //for( int i = b.length - 1 ; i >= 0 ; i--){
            for(int i = 0;i < b.length;i++){
            b[i] = a % 8 ;
                a = a / 8 ;
                }
            //for(int i = 0;i < b.length;i++){
            for( int i = b.length - 1 ; i >= 0 ; i--){
                if(b[i] != 0){
                    System.out.print(b[i]);
                }
            }
            }
}

以上代码 要么都用红色的 要么都用蓝色的  

注意数组B的输入输出顺序相反就行
----------------解决方案--------------------------------------------------------
/*
java.lang.Integer类中有一个方法可以转成八进制
public static String toOctalString(int i)

转十六进制
public static String toHexString(int i)
转二进制
public static String toBinaryString(int i)
注意返回的是字符串String
*/

import java.lang.Integer;
import java.util.Scanner;

public class Transfer {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();        
        System.out.println("转八进:" + Integer.toOctalString(a));
        System.out.println("转二进:" + Integer.toBinaryString(a));
        System.out.println("转十六进:" + Integer.toHexString(a));

    }

}


[ 本帖最后由 lampeter123 于 2010-3-28 07:44 编辑 ]
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还有这个？都没看
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谢谢了
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