Long var = (long) 999; // Line 3
long x1 = var.longValue(); // Line 5
double x2 = var.longValue(); // Line 7
double x3 = (double) var.longValue(); // Line 9
Double x4 = Long.valueOf("999"); // Line 11
Number x5 = Integer.parseInt("999"); // Line 13
Long x6 = Integer.parseInt("999"); // Line 15
Which lines are not valid and produce compile time exception ?
