What does >> mean in java?

What does >> mean in java?

In Java, is a "signed" right shift operator; it will move the operand on the left side of the operator to the right side of the operator The number of digits specified on the side. The operator uses "sign extension": if the value is positive, 0 is inserted in the high bit; if the value is negative, 1 is inserted in the high bit.

1. Its general format is as follows:

value >> num

num specifies the number of digits to shift the value value.
Just remember one thing about the rules of right shift: the sign bit remains unchanged, and the sign bit is added on the left

2. Operation rules:

Move all numbers to the binary form Move the corresponding number of digits to the right, shift out the low bit (discard), and fill the sign bit in the high bit, that is, fill the positive number with zero, and fill the negative number with 1

When the operand of the right shift is byte and short type, it will automatically Expand these types to int type.

For example, if the value to be removed is a negative number, each right shift adds 1 to the left. If the value to be removed is a positive number, each right shift adds 0 to the left. This is called a sign. Bit extension (retained sign bit) (sign extension) is used to maintain the sign of negative numbers when performing a right shift

operation.

3. Mathematical meaning

Shifting one bit to the right is equivalent to dividing by 2, and shifting n bits to the right is equivalent to dividing by 2 raised to the nth power.

4. Calculation process

11 >>2(11为int型)

1). The binary form of 11 is: 0000 0000 0000 0000 0000 0000 0000 1011

2). Put the last two digits in the low digits Shift out, padding the high bits with zeros since the number is positive.

3), the final result is 0000 0000 0000 0000 0000 0000 0000 0010.

4), converted to decimal is 3.

35 >> 2(35为int型)

1), Convert 35 to binary: 0000 0000 0000 0000 0000 0000 0010 0011

2), Move out the last two digits of the low bits: 0000 0000 0000 0000 0000 0000 0000 1000

3), convert to decimal: 8

Recommended tutorial: Java tutorial

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