When a long integer is cast into a short one, what happened?

Question

I use java to copy one long integer y to a short integer x:

long y = 40002;
short x = (short) y;
System.out.println(\"x now equals \" + x);

Answer 1

Thank all of you guys. According to all of your answers, I summarize as follows: The long value 40002 is the following 64 bits:

00000000 00000000 00000000 00000000 00000000 00000000 10011100 01000010

The conversion only retains the least significant 16 bits:

10011100 01000010

When JVM regard 10011100 01000010 as a short integer, it will compute it like this:

-2^15 + 00011100 01000010 = -32768 + 7234 = -25534

This is it.