How does Java store Negative numbers in an Integer Variable? [duplicate]

Question

How does this snippet of code prints "-511" as the output on the console?

   class Test
   {
    public static void main(String[] args) {
    int i = -0777; 
    System.out.printf("%d",i);
    }
   }

Is it to do with the way Java stores Negative numbers?

Answer 1

Integer numbers prefixed with 0 are octal numbers. To use decimal numbers remove the 0 prefix:

int i = -777;

Answer 2

Numbers starting with 0 are treated as being in octal by Java. -077 is equivalent to -63, which is what I get when I run your program.