About bit operations in java

• Question: Why does the first writing method loop to 8 and 9, the result is not the same as expected,

• If the program treats 11111110 as a decimal number (the binary of 11111110 decimal is ‭101010011000101011000110‬)

• So how do you explain the results of the previous 7 loops?
  
  The reason for the output:
  
  
  or the following code can also achieve the effect: