java十进制到（二进制，八进制，十六进制）的转换的优化

 1 import java.util.Scanner;
 2 
 3 public class ArrayTest {
 4 
 5     public static void main(String[] args) {
 6         int n, m;
 7         Scanner cin = new Scanner(System.in);
 8         n = cin.nextInt();
 9         m = cin.nextInt();
10         toBin(n);
11         toHex(m);
12     }
13 
14     public static void toBin(int n) {// 十进制--->二进制
15         tran(n, 1, 1);
16     }
17 
18     public static void toHex(int n) {// 十进制--->十六进制
19         tran(n, 15, 4);
20     }
21 
22     public static void toBa(int n) {// 十进制--->八进制
23         tran(n, 7, 3);
24     }
25 
26     public static void tran(int n, int base, int offest) {
27         if (n == 0) {
28             System.out.println(0);
29             return;
30         }
31         char[] ch = { \'0\', \'1\', \'2\', \'3\', \'4\', \'5\', \'6\', \'7\', \'8\', \'9\', \'A\',
32                 \'B\', \'C\', \'D\', \'E\', \'F\' };
33         char[] str = new char[100];
34         int pos = str.length;
35         while (n != 0) {
36             int temp = n & base;
37             str[--pos] = ch[temp];
38             n = n >>> offest;
39 
40         }
41         for (int i = pos; i < str.length; i++) {
42             System.out.println(str[i]);
43         }
44     }
45 
46 }

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