String str = "a";

    for (int i = 0; i < 8; i++) {
        str += "b";
    }
    String result = DesCfb1.encrypt(str);  // 用cfb1算法加密字符串“abbbbbbb”，返回加密后的字符串

    System.out.println("加密前：" + str);  
    System.out.println("加密后：" + result);  
}  

}