實例如下：
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public class DataTypeChangeHelper { /** * 將一個單字節的byte轉換成32位的int * * @param b * byte * @return convert result */ public static int unsignedByteToInt(byte b) { return (int) b & 0xFF; } /** * 將一個單字節的Byte轉換成十六進制的數 * * @param b * byte * @return convert result */ public static String byteToHex(byte b) { int i = b & 0xFF; return Integer.toHexString(i); } /** * 將一個4byte的數組轉換成32位的int * * @param buf * bytes buffer * @param byte[]中開始轉換的位置 * @return convert result */ public static long unsigned4BytesToInt(byte[] buf, int pos) { int firstByte = 0; int secondByte = 0; int thirdByte = 0; int fourthByte = 0; int index = pos; firstByte = (0x000000FF & ((int) buf[index])); secondByte = (0x000000FF & ((int) buf[index + 1])); thirdByte = (0x000000FF & ((int) buf[index + 2])); fourthByte = (0x000000FF & ((int) buf[index + 3])); index = index + 4; return ((long) (firstByte << 24 | secondByte << 16 | thirdByte << 8 | fourthByte)) & 0xFFFFFFFFL; } /** * 將16位的short轉換成byte數組 * * @param s * short * @return byte[] 長度為2 * */ public static byte[] shortToByteArray(short s) { byte[] targets = new byte[2]; for (int i = 0; i < 2; i++) { int offset = (targets.length - 1 - i) * 8; targets[i] = (byte) ((s >>> offset) & 0xff); } return targets; } /** * 將32位整數轉換成長度為4的byte數組 * * @param s * int * @return byte[] * */ public static byte[] intToByteArray(int s) { byte[] targets = new byte[2]; for (int i = 0; i < 4; i++) { int offset = (targets.length - 1 - i) * 8; targets[i] = (byte) ((s >>> offset) & 0xff); } return targets; } /** * long to byte[] * * @param s * long * @return byte[] * */ public static byte[] longToByteArray(long s) { byte[] targets = new byte[2]; for (int i = 0; i < 8; i++) { int offset = (targets.length - 1 - i) * 8; targets[i] = (byte) ((s >>> offset) & 0xff); } return targets; } /**32位int轉byte[]*/ public static byte[] int2byte(int res) { byte[] targets = new byte[4]; targets[0] = (byte) (res & 0xff);// 最低位 targets[1] = (byte) ((res >> 8) & 0xff);// 次低位 targets[2] = (byte) ((res >> 16) & 0xff);// 次高位 targets[3] = (byte) (res >>> 24);// 最高位,無符號右移。 return targets; } /** * 將長度為2的byte數組轉換為16位int * * @param res * byte[] * @return int * */ public static int byte2int(byte[] res) { // res = InversionByte(res); // 一個byte數據左移24位變成0x??000000，再右移8位變成0x00??0000 int targets = (res[0] & 0xff) | ((res[1] << 8) & 0xff00); // | 表示安位或 return targets; } } |
以上就是小編為大家帶來的java byte數組與int,long,short,byte的轉換實現方法全部內容了，希望大家多多支持服務器之家~
