Java字符串转两位小数 java将字符串转换为二进制

因为学完DES的c语言实现，需要进行DES的Java实现，看了网上很多有关进制转换的代码，都不符合我的想法，所以就自己重写了一下，以防以后代码丢失，小记一下。

1 import java.util.Scanner;
 2 /**
 3  * @author :cjc
 4  * @date : 2022/7/23
 5  */
 6 public class helloword {
 7     public static void main(String[] args) {
 8         int m[] = new int[64];
 9         Scanner in = new Scanner(System.in);
10         System.out.print("请输入16进制的明文：");
11         String kk = new String();
12         kk = in.next();
13         int len = kk.length();
14         while (len != 16) {
15             System.out.print("请重新输入16进制的明文：");
16             kk = new String();
17             kk = in.next();
18             len = kk.length();
19         }
20         char[] kk1 = kk.toCharArray();
21         int j = 0;
22         for (int i = 0; i < 16; i++) {
23             int a;
24             if (kk1[i] >= '0' && kk1[i] <= '9')
25                 a = kk1[i] - '0';
26             else
27                 a = kk1[i] - 'a' + 10;
28             int n[] = new int[4];
29             int f = 0;
30             while (a != 0) {
31                 n[f] = a % 2;
32                 a = a / 2;
33                 f++;
34             }
35             m[j * 4] = n[3];
36             m[j * 4 + 1] = n[2];
37             m[j * 4 + 2] = n[1];
38             m[j * 4 + 3] = n[0];
39             j++;
40         }
41         System.out.print("二进制为：");
42         for (int i = 0; i < 64; i++) {
43             if (i % 64 == 0) System.out.println();
44             System.out.print(m[i]);
45             
46         }
47     }
48 }