Detailed introduction to java bit shift operator

Java bit shift operators are operators that operate on binary numbers. They move the bits of the binary number to the left or right by a specified number of bits, and then fill in the zero bit or sign bit. There are three bit shift operators: left shift operator (<<), right shift operator (>>), and unsigned right shift operator (>>>).

The bitwise shift operator in Java is an operator that operates on binary numbers. They move the bits of a binary number to the left or right by a specified amount. number of bits, and then pad the zero or sign bits. There are three bit shift operators in Java: left shift operator (<<), right shift operator (>>) and unsigned right shift operator (>>>). The following describes the usage and characteristics of these three operators in detail.

1. Left shift operator (<<)

The left shift operator moves a binary number to the left by the specified number of digits, and then fills the zero bits on the right. For example, shifting the binary number 1010 to the left by 2 bits yields 00101000 (40 in decimal). The syntax of the left shift operator is as follows:

int result = value << num;

Among them, value is the binary number to be moved, num is the number of digits to be moved, and result is the result of the operation.

2. Right shift operator (>>)

The right shift operator moves a binary number to the right by the specified number of digits, and then fills the sign bit on the left. If the original number is positive, it is padded with zero bits on the left; if the original number is negative, it is padded with one bit on the left. For example, shifting the binary number 1010 to the right by 2 bits yields 00001010 (decimal number 2). The syntax of the right shift operator is as follows:

int result = value >> num;

Among them, value is the binary number to be moved, num is the number of digits to be moved, and result is the operation result.

3. Unsigned right shift operator (>>>)

The unsigned right shift operator moves a binary number to the right by the specified number of digits, then on the left Fill zero bits. The unsigned right shift operator does not consider the sign bit and pads zero bits on the left regardless of whether the original number is positive or negative. For example, unsigned right shift of the binary number 1010 by 2 bits yields 00001010 (decimal number 2). The syntax of the unsigned right shift operator is as follows:

int result = value >>> num;

Among them, value is the binary number to be moved, num is the number of digits to be moved, and result is the result of the operation.

It should be noted that the displacement operator can only be used for integer types, not floating point types. In addition, the number of bits to be moved must be a non-negative integer, otherwise an exception will be thrown. When using bitwise operators, special attention should be paid to how the sign bit and zero bit are filled to avoid unexpected operation results.

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