If Statment - Java2

package lesson;
// write a program hat uses the JOptionPane to calc the avg of three test scores
//program should ask user for three test scoresand calc avg,
//if avg >= 95 output "thats a great score"
// avg
import javax.swing.JOptionPane;
public class IfStatment
{

	public static void main(String[] args)
	{
		String s;
		double s1, s2, s3, avg;
		JOptionPane.showMessageDialog(null,"this program will find the average of three text scores");
		s = JOptionPane.showInputDialog("enter test score 1");
		s1 = Double.parseDouble(s);
		s = JOptionPane.showInputDialog("enter test score 2");
		s2 = Double.parseDouble(s);
		s = JOptionPane.showInputDialog("enter test score 3");
		s3 = Double.parseDouble(s);

		avg = (s1+s2+s3)/3.0;

		if (avg >= 95 )
		{
		JOptionPane.showMessageDialog(null,"Thats a great score");
		}

			System.exit(0);
		//comparison operators
			// '==' equality operator
			// >, < greater/ less than
			// >=, <= greater/less than or equal to
			// != not equal to

	}

}