import java.util.*;		// Random and Scanner

public class Ch14_3		// program demonstrates use of ArrayIndexOutOfBoundsException by filling an array[100] with random elements
{						// and asking the user for an index to return the random value, but if the index is out of bounds, throw an exception
	public static void main(String[] args)
	{
		int[] values=new int[100];	// our array
		int i, index;				// i used in the for loop, index is the input from the user which may be out of bounds
		Random g=new Random();		// used to randomly generate numbers
		Scanner s=new Scanner(System.in);	// for input from user to get an index
		for(i=0;i<100;i++)
			values[i]=g.nextInt(10000)+1;	// fill array with random values
		System.out.print("Enter an index, I will tell you the value (enter -9999 to quit):  ");	
		index=s.nextInt();				// get user's input index, could be out of bounds
		while(index!=-9999)				// use a loop here so you can test out several values, notice the placement of the try and catch blocks inside this loop
		{
			try				// try to access the array element
			{
				System.out.println("The value at index " + index + " is " + values[index]);	// try to access values[index], may throw an Exception
			}
			catch(ArrayIndexOutOfBoundsException e)	// on erroneous array element, get caught here		
			{
				System.out.println(e);				// output the exception
			}
			System.out.print("Enter an index, I will tell you the value (enter -9999 to quit:  ");
			index=s.nextInt();
		}		// we could put more of the code inside the try block but really only the values[index] needs to go there
	}
}