为何与0xff进行与运算 在剖析该问题前请看如下代码 public static String bytes2HexString(byte[] b) { String ret = ""; for (int i = 0; i < b.length; i++) { String hex = Integer.toHexString(b[ i ] & 0xFF); if (hex.length() == 1) { hex = '0' + hex; } ret += hex.toUp
python3.4 UnicodeDecodeError: 'gbk' codec can't decode byte 0xff in position 实用python的时候 打开一个csv的文件出现一下错误. 然后百度了一下,找到了对应的解决方案 with open('History.csv','r',encoding='utf-8') as f: 在后面加上encoding=utf-8即可
static final char[] HEX_CHARS = "0123456789abcdef".toCharArray(); //转换为十六进制 public static String toHexString(byte[] b ) { StringBuilder sb = new StringBuilder(b.length << 2); for (byte x : b) { //byte只有8位 int 则是32位 x& oxff之后会转换为int类型 i