title: java byte data type
body: <p>In Sun' tutorial it says about a byte:</p>
  
  <blockquote>
    <p>byte: The byte data type is an 8-bit signed two's complement integer. It has a minimum value of -128 and a maximum value of 127 (inclusive). The byte data type can be useful for saving memory in large arrays, where the memory savings actually matters. They can also be used in place of int where their limits help to clarify your code; the fact that a variable's range is limited can serve as a form of documentation. </p>
  </blockquote>
  
  <p>How does it save memory? What is 2's compliment?</p>