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,short

short anUnsignedByte = 0;
char anUnsignedShort = 0;
long anUnsignedInt = 0;
        int firstByte = 0;
        int secondByte = 0;
        int thirdByte = 0;
        int fourthByte = 0;

byte buf[] = getNetData();//如:读网络字节数据
int index = 0;
        firstByte = (0x000000FF & ((int)buf[index]))
index++;
anUnsignedByte = (short)firstByte;

        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;