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Thread: Need help with array code

  1. #1
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    Default Need help with array code

    Hi I'm just beginning to learn and work with arrays and I was going to try a program that ask the user to enter 8 hourly temperatures and let the program output these temperatures.

    When I run the program and enter the 8 temperatures this is what my prompt says:

    'Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 8 at TemperatureArray.main(TemperatureArray.java:18)'

    I have never seen this before.. my code compiles fine but here it is also:

    import java.util.*;
     
    public class TemperatureArray
    {
    	static Scanner console = new Scanner(System.in);
     
    	public static void main(String[] args)
    	{
    		int[] temp = new int[8];
     
    		int avg;
    		int index;
     
    		System.out.println("Enter 8 numbers: ");
     
    		for (index = 0; index < temp.length; index++)
    			temp[index] = console.nextInt();
    			System.out.print(temp[index] + " ");
     
    	}
    }


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Need help with array code

    You forgot to put the braces around the for loop. Also, as a good programming practice, don't declare for loop counters outside of the for loop.

    // ex.
    for (int index = 0; index < temp.length; index++)
    {
         temp[index] = console.nextInt();
         System.out.print(temp[index] + " ");
    }

  3. The Following User Says Thank You to helloworld922 For This Useful Post:

    n00bprogrammer (April 6th, 2010)

  4. #3
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    Default Re: Need help with array code

    Thanks a lot for the tip and correction.. now I have to figure out how to get the output to print after I type all of the input lol

    It's a shame I've had to pay $80 for a book full of errors. My book was saying to print an array do a for loop like:

    for (index = 0; index < array.length; index++)
         System.out.print(array[index] + " ");

  5. #4
    Super Moderator helloworld922's Avatar
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    Default Re: Need help with array code

    That's actually correct. Again, from a programming style I prefer to put the index declaration inside the for loop as a second check just to make sure I don't use that variable anywhere else (at least not without re-declaring it).

    If you want to have the display after, simply use two loops: one to get the input from the user, and the second loop to print out the display.

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