C的无符号数据类型int,short,byte 转为 Java对应的数据long,char,short

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//从网络中读取C的无符号int,short,byte字节数组，相应转换成java的long,char,shortshort anUnsignedByte = 0;char anUnsignedShort = 0;long anUnsignedInt = 0;      int firstByte = 0;     int secondByte = 0;       int thirdByte = 0;       int fourthByte = 0;byte buf[] ="1234567890".getBytes();//如:读网络字节数据int index = 0;firstByte = (0x000000FF & ((int)buf[index]));anUnsignedByte = (short)firstByte;  index++;firstByte = (0x000000FF & ((int)buf[index])) ;   secondByte = (0x000000FF & ((int)buf[index+1]));index = index+2;anUnsignedShort  = (char) (firstByte << 8 | secondByte);   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;anUnsignedInt  = ((long) (firstByte << 24  | secondByte << 16| thirdByte << 8   | fourthByte))  & 0xFFFFFFFFL;