попробуйте это
int[] cw_Mark = new int[6];
for (int i = 0; i < cw_Mark.length; i++) {
System.out.println("Please Enter Your Module " + (i + 1) + " Coursework Mark: ");
while (true) {
String next = input.next();
try {
cw_Mark[i] = Integer.parseInt(next);
if (i >= 0 || i <= 100) {
break;
}
} catch (NumberFormatException e) {
}
System.out.println("Please Enter a Number Between 1 and 100");
}
}