Clearing, Reset, Removing Array Int.

Question

I'm having a problem with a small class exersize. So far I am able to find the max, min, and average of the grades. As well as have them being entered. My teacher recently wanted us to add a try/catch methods so in case a user enters a negative grade it will catch it.
Ok...so that works. But now when the user enters new grades, and then decides to select the average, it averages some of the grades from the previous entries. Then the max, min cannot be found either.
This program is based on a switch method with cases. Here is the first case. where the grades are entered and the try and catch method is use.
I know, or at least I think I know that I need to clear or reset the array so that new entries can be entered successfully. I looked all over the net. I saw methods such as these:
gradebook.clear()
gradebook.remove()
removeAll()I played around with them for a bit to see what I can get out of it, but nothing is working. These methods are not recognized. Any suggestions guys/gals?
If I cant find a solution I will have the user select case 5 and exit the program and start it over. No biggy.
Thanks !
Mike
public class GradeBookSolution2
  public static void main(String[] args)
    Scanner keyboard = new Scanner(System.in);
    int[] gradebook = new int[11];
    int grade = 0;
    int choice = 0;     
    while(choice != 5)
         Menu();
         choice = keyboard.nextInt();
         switch(choice)
            case 1:
            System.out.println("Please enter 10 class grades followed by any number.");
            try
                for (int i = 0; i < 11; i++)
                     gradebook[i] = grade;                          grade = keyboard.nextInt();
                     if(grade < 0)                     
                          throw new IOException("Exception: YOU CANNOT HAVE A NEGATIVE GRADE");                    
          catch(IOException e)           
        removeAll(); //  <-- This is where and when I want to clear the array?
       System.out.println(e.getMessage());
       //System.out.println("Please exit the program and start over");
break;

Answer 1

The methods you are trying to use are part of the Collections API. arrays do not have these methods you would need to use a Collection like an array that would have these methods... like an ArrayList for example.