How the byte range is -128 to 127 in java.How it is possible? [duplicate]

Answer 1

One bit is reserved for detrmining whether number is negative or positive .

So for max postive number value will be

 01111111 which gives the int number as 128(leftmost bit 0 represent its a postive number)

        64+32+6+8+4+2+1= 127

for max negativenumber value will ((leftmost bit 1 represent its a negative number))

  10000000 which gives the int number as -128

  -128+0+0+0+0+0+0+0 = -128

so range becomes from

  -127 to 128