Need help with an Array!

How do I get the variable checkNumber to read from the input and exit if the user enters a value less than 0? I initially created the array to accept 10 integer values and then average and sum them using JOptionPane. Now I would like the user to be able to exit the program if a negative value is entered in the input. Here's how it looks so far and I understand the if statement is where I am losing it.

Code :

import java.text.NumberFormat;
import java.text.DecimalFormat;
import javax.swing.*;
 
class originalArray
{
    public static void main(String args[])
    {
        int checkNumber;
        int inputArray[] = new int[10]; 
        int arrayLength = inputArray.length;
        Boolean keepRunning = true;
 
            while (keepRunning)
            {
                for(int i=0;i<arrayLength;i++) 
                inputArray[i]=Integer.parseInt(JOptionPane.showInputDialog("Enter integer for array location "+i+" :")); 
                //checkNumber = inputArray;
                if (checkNumber <0)
                    {
                        System.exit(0);
                    }   
                else           
                    {
                        int sum = 0;
                        String loc = "";
 
                        for(int i=0; i<arrayLength; i++)
                        {
                            sum+= inputArray[i];
                            loc+= "Array location " + i + " is " + inputArray[i] + "\n";
                        }
 
                            double avg;
                            NumberFormat formatter = new DecimalFormat ("#0.000");
                            avg =(double)sum/10;
 
 
                            JOptionPane.showMessageDialog (null, loc + "The sum or the array is " + sum + "\n The average of the array is " + formatter.format(avg));
                        }
                    }
              }       
 
}