import javax.swing.JOptionPane;

public class lab8 {
	public static void main(String[] args) {
   //getStudentLevel
   String studentLevel = getStudentLevel();
	//getNumberOfCredits
   int numberOfCredits = getNumberOfCredits();
	//getCalculateTotalCostGraduate
   double totalCost = getCalculateTotalCost(studentLevel, numberOfCredits);
	//displayMessage
   displayMessage(totalCost);
}

public static String getStudentLevel(){

    String studentLevel;
   do{
      try{
         studentLevel = JOptionPane.showInputDialog("Enter your student level (Graduate or UnderGraduate) ");
      }catch(NumberFormatException e){
     studentLevel = "G";
      }

   }while (!(studentLevel.equals("Graduate") || studentLevel.equals("UnderGraduate")));

   return studentLevel;
   };

 public static int getNumberOfCredits(){

   int numberOfCredits;

   do{
     try{
         numberOfCredits = Integer.parseInt(JOptionPane.showInputDialog("Enter number of credits 1-21: "));
     }catch (NumberFormatException nfe) {
      numberOfCredits = 0;
     }

   }while(numberOfCredits <= 0 || numberOfCredits >= 21);

   return numberOfCredits;
   };

    public static double getCalculateTotalCost(String studentLevel, int numberOfCredits){
    double totalCost;

      if (studentLevel.equals("Graduate")){
      totalCost = numberOfCredits * 750;
         }else {
        totalCost =  numberOfCredits * 400;
        }
      if (numberOfCredits >= 16) {
      totalCost = totalCost + 500;
      }
      return totalCost;
   };

   public static void displayMessage(double totalCost){

            JOptionPane.showMessageDialog(null, "The total enrollment cost is: $" + totalCost);
   };

}