java整数与byte数组的转换实现代码

public class NumberUtil {      public static byte[] intToByte4(int i) {     byte[] targets = new byte[4];     targets[3] = (byte) (i & 0xFF);     targets[2] = (byte) (i >> 8 & 0xFF);     targets[1] = (byte) (i >> 16 & 0xFF);     targets[0] = (byte) (i >> 24 & 0xFF);     return targets;   }       public static byte[] longToByte8(long lo) {     byte[] targets = new byte[8];     for (int i = 0; i < 8; i++) {       int offset = (targets.length - 1 - i) * 8;       targets[i] = (byte) ((lo >>> offset) & 0xFF);     }     return targets;   }       public static byte[] unsignedShortToByte2(int s) {     byte[] targets = new byte[2];     targets[0] = (byte) (s >> 8 & 0xFF);     targets[1] = (byte) (s & 0xFF);     return targets;   }       public static int byte2ToUnsignedShort(byte[] bytes) {     return byte2ToUnsignedShort(bytes, 0);   }       public static int byte2ToUnsignedShort(byte[] bytes, int off) {     int high = bytes[off];     int low = bytes[off + 1];     return (high << 8 & 0xFF00) | (low & 0xFF);   }       public static int byte4ToInt(byte[] bytes, int off) {     int b0 = bytes[off] & 0xFF;     int b1 = bytes[off + 1] & 0xFF;     int b2 = bytes[off + 2] & 0xFF;     int b3 = bytes[off + 3] & 0xFF;     return (b0 << 24) | (b1 << 16) | (b2 << 8) | b3;   } }