Java中进行字符串类型转换为二进制数组

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。

import java.util.Scanner;
/**
 * @author :cjc
 * @date : 2022/7/23
 */
public class helloword {
    public static void main(String[] args) {
        int m[] = new int[64];
        Scanner in = new Scanner(System.in);
        System.out.print("请输入16进制的明文：");
        String kk = new String();
        kk = in.next();
        int len = kk.length();
        while (len != 16) {
            System.out.print("请重新输入16进制的明文：");
            kk = new String();
            kk = in.next();
            len = kk.length();
        }
        char[] kk1 = kk.toCharArray();
        int j = 0;
        for (int i = 0; i < 16; i++) {
            int a;
            if (kk1[i] >= '0' && kk1[i] <= '9')
                a = kk1[i] - '0';
            else
                a = kk1[i] - 'a' + 10;
            int n[] = new int[4];
            int f = 0;
            while (a != 0) {
                n[f] = a % 2;
                a = a / 2;
                f++;
            }
            m[j * 4] = n[3];
            m[j * 4 + 1] = n[2];
            m[j * 4 + 2] = n[1];
            m[j * 4 + 3] = n[0];
            j++;
        }
        System.out.print("二进制为：");
        for (int i = 0; i < 64; i++) {
            if (i % 64 == 0) System.out.println();
            System.out.print(m[i]);
            
        }
    }
}