Average grade program

[sun20j2001]

i need help with my array ad parameters i don't know how to fix this program.
This is a program that allows a user to enter class grades into an array of floats. The app will prompt for the total number of grades to be entered, then call a method to average the grades, and display the grades and the resulting average.

This is my code
import javax.swing.JOptionPane;
public class Average {
public static void main(String[]args)
{
String input,amount;
double data[], gradetotal1;
double sum=0,average;

System.out.println("\tAverage Program");
amount=JOptionPane.showInputDialog("Input Number of grades to enter");
gradetotal1=Double.parseDouble(amount);

data[]=gradetotal1;

for (int i=0;i<data.length;i++){
input=JOptionPane.showInputDialog("Enter grades");
data[i]=Double.parseDouble(input);
}
for(int i=0;i<data.length;i++){
sum+=data[i];

average=sum/data.length;

JOptionPane.showMessageDialog(null, "The total is:"+sum+"The Average is:"+average, JOptionPane.INFORMATION_MESSAGE);
}
}

}

[javinpaul]

Try this, now finding out what I have changed and why is your job

import javax.swing.JOptionPane;

public class Average{

	public static void main(String[] args) {
		String input, amount;
		double data[];
		int gradetotal1;
		double sum = 0, average = 0;

		System.out.println("\tAverage Program");
		amount = JOptionPane.showInputDialog("Input Number of grades to enter");
		gradetotal1 = Integer.parseInt(amount);
		data = new double[gradetotal1];

		for (int i = 0; i < data.length; i++) {
			input = JOptionPane.showInputDialog("Enter grades");
			data[i] = Double.parseDouble(input);
		}
		for (int i = 0; i < data.length; i++) {
			sum += data[i];

			average = sum / data.length;

		}
		JOptionPane.showMessageDialog(null, "The total is: " + sum
				+ " The Average is: " + average, "Result",
				JOptionPane.INFORMATION_MESSAGE);
	}

}

[cens]

data[] = new double(gradetotal1);

[keang]

data[] = new double(gradetotal1);

What is that supposed to do?

[cens]

Just corrected a mistake he said data[] = gradetotal1; which is a mistake.

[Peter_B]

data[] = new double(gradetotal1);

Just corrected a mistake he said data[] = gradetotal1; which is a mistake.

The correct code (which is in javinpaul's last post) is

double data[];
...
data = new double[gradetotal1];

You don't need the [] in the assignment, just in the declaration.