getting input from stdin

Question

I want to get input from stdin in the for of

3
10 20 30

the first number is the amount of numbers in the second line. Here's what I got, but it is stuck in the while loop... so I believe. I ran in debug mode and the array is not getting assign any values...

import java.util.*;

public class Tester {   

   public static void main (String[] args)
   {

       int testNum;
       int[] testCases;

       Scanner in = new Scanner(System.in);

       System.out.println("Enter test number");
       testNum = in.nextInt();

       testCases = new int[testNum];

       int i = 0;

       while(in.hasNextInt()) {
           testCases[i] = in.nextInt();
           i++;
       }

       for(Integer t : testCases) {
           if(t != null)
               System.out.println(t.toString());               
       }

   } 

} 

Answer 1

It has to do with the condition.

in.hasNextInt()

It lets you keep looping and then after three iterations 'i' value equals to 4 and testCases[4] throws ArrayIndexOutOfBoundException.

The Solution to do this could be

for (int i = 0; i < testNum; i++) {
 *//do something*
}