9/9/2023 0 Comments Java reverse bits in a byte![]() ![]() In this case, the 0 values mask the bits that are not of interest.) (By analogy, the use of masking tape covers, or masks, portions that should not be altered or portions that are not of interest. For example, given a bit pattern 0011 (decimal 3), to determine whether the second bit is set we use a bitwise AND with a bit pattern containing 1 only in the second bit:īecause the result 0010 is non-zero, we know the second bit in the original pattern was set. The operation may be used to determine whether a particular bit is set (1) or cleared (0). Thus, if both bits in the compared position are 1, the bit in the resulting binary representation is 1 (1 × 1 = 1) otherwise, the result is 0 (1 × 0 = 0 and 0 × 0 = 0). A simple but illustrative example use is to invert a grayscale image where each pixel is stored as an unsigned integer.ĪND Bitwise AND of 4-bit integersĪ bitwise AND is a binary operation that takes two equal-length binary representations and performs the logical AND operation on each pair of the corresponding bits. For example, for 8-bit unsigned integers, NOT x = 255 - x, which can be visualized on a graph as a downward line that effectively "flips" an increasing range from 0 to 255, to a decreasing range from 255 to 0. If two's complement arithmetic is used, then NOT x = -x − 1.įor unsigned integers, the bitwise complement of a number is the "mirror reflection" of the number across the half-way point of the unsigned integer's range. The result is equal to the two's complement of the value minus one. Bits that are 0 become 1, and those that are 1 become 0. The bitwise NOT, or bitwise complement, is a unary operation that performs logical negation on each bit, forming the ones' complement of the given binary value. For example, the binary value 0001 (decimal 1) has zeroes at every position but the first (i.e., the rightmost) one. In the explanations below, any indication of a bit's position is counted from the right (least significant) side, advancing left. While modern processors usually perform addition and multiplication just as fast as bitwise operations due to their longer instruction pipelines and other architectural design choices, bitwise operations do commonly use less power because of the reduced use of resources. On simple low-cost processors, typically, bitwise operations are substantially faster than division, several times faster than multiplication, and sometimes significantly faster than addition. Most bitwise operations are presented as two-operand instructions where the result replaces one of the input operands. It is a fast and simple action, basic to the higher-level arithmetic operations and directly supported by the processor. In computer programming, a bitwise operation operates on a bit string, a bit array or a binary numeral (considered as a bit string) at the level of its individual bits. For the general concept, see Offset binary. For the excess-3 code, see Shifted binary (code). Using Charset."Binary shift" redirects here. So far, we have converted a byte array into a String using the constructor, and now we'll look into the other approaches. String string = new String(byteArrray, charset) Then let's encode a string using a named charset: void whenGetBytesWithNamedCharset_thenOK()īyte byteArrray = inputString.getBytes("IBM01140") We can get this charset by calling faultCharset(). ![]() The above method is platform-dependent, as it uses the platform's default charset. getBytes (Charset charset) – encodes using the provided charsetįirst, let's encode a string using the platform's default charset: String inputString = "Hello World!" īyte byteArrray = inputString.getBytes().getBytes (String charsetName)– encodes using the named charset.getBytes() – encodes using platform's default charset. ![]() The String class provides three overloaded getBytes methods to encode a String into a byte array: ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |