i have a classroom grading management application that i made in JAVA.

i set two arrays ( students, grades) and populated them with data already.

i built a menu that gives you option to type in so you can see the information.

with JOptionPane you input...

"a" to see the average of the grades

"v" to show student names and grades

"e" to enter a new grade for student

"q" to quit

i cannot figure out how to program the "e" i need to ask the user for the index position of the grade they wish to change using JOptionPane. Then i need to obtain a new grade from the users input and change the value of the index postion that the user specified.

example [ 98, 76, 88, 65, 92]

JOptionPane.showInputDialog( "Please enter the index position of the grade you wish to change");

if user inputs "2", then it should target the "88"

JOptionPane.showInputDialog( "please enter new grade");

if user puts in "83" it should replace that "88" with the new number grade.

public class project2 {

public static void main(String[] args) { String[] students = {"Bob", "Joe", "Paul", "Amanda", "Chris"}; int[] grades = {98, 76, 88, 65, 92}; String menuchoice = showMenu(); while (menuchoice.equalsIgnoreCase("q") == false ){ if(menuchoice.equalsIgnoreCase("a") == true) { int sum = 0; for( int i = 0; i < grades.length; i++) { sum += grades[i]; }//ends for loop double avg = sum / grades.length; JOptionPane.showMessageDialog(null, "Average of all 5 grades is: " + " " + avg); }// ends if statement else if(menuchoice.equalsIgnoreCase("v") == true) { String displayinfo = "Students names and grades "; for(int i =0; i < grades.length; i++ ) { displayinfo += students[i] + " -> " + grades[i] + " "; }//ends for loop JOptionPane.showMessageDialog(null, displayinfo ); }// ends 1st else if else if(menuchoice.equalsIgnoreCase("e") == true) { // ask user to input index position of the number they want to change [0, 1, 2, 3, 4] JOptionPane.showInputDialog("Please enter the index position of the grade you wish to change "); //obtain a new grade JOptionPane.showInputDialog("Please enter new grade "); //show new array

}//ends 2nd else if menuchoice = showMenu(); }//ends while loop "q" }// end main //show Menu Method first public static String showMenu() { String msg = "Please select a menu option "; msg += "(v)iew all students grades "; msg += "(a)verage of all grades "; msg += "(e)nter new grade for student "; msg += "(q)uit program "; return JOptionPane.showInputDialog( msg ); }//ends showMenu

}// end class