New to Java

import javax.swing.JOptionPane;

public class ArrayExceptionDemo
{
	double num[] = new double[15];
	
	int howManyNums;
	String sHowMany;
	String title = "Array Exception Demo";
	
	public ArrayExceptionDemo()
	{
		fillArray();
	{
	
	public void fillArray()   //MY ERRORS ARE HERE WITH IT  PUBLIC, I Have it typed out just like my book says and have gone over the spelling with a fine tooth comb
	{
	
			sHowMany + JOptionPane.showInputDialog(null, 
			"How many random numbers do you wish to place in the array (15 max).",
			title, JOptionPane.QUESTION_MESSAGE);
			
//Now we put the code that might generate an error inside a try block
			try 
			{
			//The parseInt will throw an exception if it doesn't get a valid int.
					howManyNums = Integer.parseInt(sHowMany);
					
	//If we try to go beyond our array bounds we will ger an exception!
	//(This is a good example why we should use number.length
	//in for loops that traverse arrays.)
					for(int i = 0; i < howManyNums; ++i)
					{
						num[i] = Math.random();
						System.out.println( num[i] );
					}
			}
			
	//We use the superclass exception to catch everything!
			catch(Exception e)
			{
					JOptionPane.showMessageDialog(null, "Error happened ",
					"In the catch", 2);
					
					
	//printStackTrace prints the exception to the command window.
				e.printStackTrace();
			}
			
	}
	
	
	public static void main(String args[] )
	{
			ArrayExceptionDemo theApp = new ArrayExceptionDemo();
			System.exit(0);
	}
}//It is also expecting a ";" at the end here.