Introduction to Java Programming编程题12.3<ArrayIndexOutBoundsException>

Enter the array's index less than 100: -5 q 111 9
Out of bounds.
Enter the array's index less than 100: qq
Index must be digital.
Enter the array's index less than 100: 5
Index 5: 144

import java.util.InputMismatchException;
import java.util.Scanner;

public class ArrayIndexOutBounds {
public static void main(String[] args) {
int[] a = new int[100];
for (int i = 0; i < 100; i++) {
a[i] = (int) (Math.random() * 200);
}
Scanner input = new Scanner(System.in);
boolean n = true;
do {
System.out.print("Enter the array's index less than 100: ");
try {
int index = input.nextInt();
if (index >= 0 || index < 100) {
System.out.println("Index " + index + ": " + a[index]);
n = false;
}
} catch (InputMismatchException e) {
System.out.println("Index must be digital.");
} catch (ArrayIndexOutOfBoundsException e) {
System.out.println("Out of bounds.");
}
input.nextLine();
} while (n);
}
}