So I've been working on an assignment that requires us to build a "Patient manager", that bases which patient to be treated first based on the emergency level. The main issue I'm running into is that when the user enters something apart from a number into the emergency column, it crashes the program and gives me an InputMismatchException, despite with me attempting to catch it. Any ideas are greatly appreciated!
import java.util.*;
public class PatientManager {
private PriorityQueue<Patient> waitingList;
public PatientManager() {
waitingList = new PriorityQueue<Patient>();
}
// Starter method
public void start() {
String choice;
Scanner in = new Scanner(System.in);
String name;
int emergency = 0;
int order = 0;
Patient patient;
System.out.println("-------------------------------");
System.out.println("(1) New Patient.");
System.out.println("(2) Next Patient.");
System.out.println("(3) Waiting List.");
System.out.println("(4) Exit.");
System.out.println("-------------------------------");
while (true) {
System.out.print("* Choose an item from the menu:");
choice = in.next();
switch (choice) {
case "1":
System.out.println("Enter patient's name:");
name = in.next();
System.out.println("Enter emergency [1 (low) to 5 (life-and-death)]:");
while (true) {
try {
emergency = in.nextInt();
if (emergency >= 1 && emergency <= 5)
break;
else {
System.out.println("(x) Wrong value. Try again:");
emergency = in.nextInt();
}
} catch (Exception e) {
System.out.println("(x) Wrong value. Try again:");
emergency = Integer.parseInt(in.nextLine());
}
}
order++;
patient = new Patient(order, name, emergency);
waitingList.add(patient);
System.out.println("Patient added to the waiting list.");
break;
case "2":
if (waitingList.isEmpty()) {
System.out.println("No more patients.");
} else {
patient = waitingList.remove();
System.out.println(patient.getName() + " is treated.");
}
break;
case "3":
if (waitingList.size() == 0) {
System.out.println("No patients in the list.");
} else {
System.out.println("Waiting list includes:");
Iterator<Patient> iterator = waitingList.iterator();
while (iterator.hasNext()) {
patient = (Patient) iterator.next();
System.out.println("- " + patient.toString());
}
}
break;
case "4":
System.out.println("Program terminated. Good bye!!");
in.close();
System.exit(0);
break;
default:
System.out.println("(x) Wrong choice.");
break;
}
}
}
}
I managed to fix it. I cleared the result of scanner by just adding in.next() into the catch block. So it looks like this:
catch (Exception e) {
System.out.print("(x) Wrong value. Try again:");
in.next();
System.out.println(emergency);
}