The application as written does not display certain class names included in the instructions as written.

Write an application that stores at least four different course names and meeting days and times in a two-dimensional string array. Allow the user to enter a course name (such as CIS 110) and display the day of the week and times that the course is held (such as Th 330). If the course does not exist, display an error message.

import javax.swing.JOptionPane;
import java.util.Scanner;

public class Schedule {
public static void main(String[] args) {
//declare variables and arrays
final int NUM_RANGES = 4;
int sub = NUM_RANGES - 1;

String[][] classNames = {
{"COM 209", "MAT 201", "MAT 141", "ENG 220"},
{"Mon 1:00","Tue 8:30","Thu 7:30","Fri 9:15",}
};

//get input
String classInput = JOptionPane.showInputDialog("Please input a class name: ");

//match to output and print
while(sub >= 0)
--sub;

if (classInput.equals(classNames[0])) {
JOptionPane.showMessageDialog(null, "Class time is: " + classNames[0][0]);
System.exit(0);
}
else if (classInput.equals("COM 209")) {
JOptionPane.showMessageDialog(null, "Class time is: " + classNames[1][1]);
System.exit(0);
}
else if (classInput.equals("MAT 201")) {
JOptionPane.showMessageDialog(null, "Class time is: " + classNames[2][2]);
System.exit(0);
}
else if (classInput.equals("MAT 141")) {
JOptionPane.showMessageDialog(null, "Class time is: " + classNames[3][3]);
System.exit(0);
}
else if (classInput.equals("ENG 220")) {
JOptionPane.showMessageDialog(null, "Class time is: " + classNames[4][4]);
System.exit(0);
}

else {
JOptionPane.showMessageDialog(null, "Please enter a valid class name.");
System.exit(0);
}
}
}