int current, prev = 1, prevprev = 0;// Initialize some variables
for(int i = 0; i < 20; i++) { // Loop exactly 20 times
current = prev + prevprev; // Next number is sum of previous two
System.out.print(current + " "); // Print it out
prevprev = prev; // First previous becomes 2nd previous
prev = current; // And current number becomes previous
}
System.out.println(); // Terminate the line, and flush output
