Java 中的 InputMismatchException 替换 while 循环

Question

In my task I need to put InputMismatchException when user tries to enter some values. User get some numbers from 1 to some number (simptoms.lenght).

int number=0;
            do{
                System.out.printf("Choose %d simptoms: \n", number+1);
                for(int j=0; j< simptomi.length;j++){
                    System.out.printf("%d. %s %s\n", j + 1, simptoms[j].getName(), 
simptoms[j].getValue());

            }
            System.out.print("Choose: ");

            while(!scanner.hasNextInt()){
                System.out.println("Please enter number!");
                scanner.next();
            }
            
            
            number=scanner.nextInt();
            scanner.nextLine();

            if(number<0 || number> simptoms.length){
                System.out.println("Error, choose again");

            }

        }while(number<0  || number> simptoms.length);

After this code I tried to do this: instead of while(!scanner.hasNextInt()) I tried with try and I get this message:

Declaration, final or effectively final variable expected.

Is this the right way of replacing while loop or I should try to add something else. I'm thinking about boolean = false and somehow try with that but I don't understand how to implement it properly.

I tried this:

  try{
     number=scanner.nextInt();
     scanner.nextLine();
     }

     catch (InputMismatchException ex){
     System.out.println("Please, enter number!");
            }

Answer 1

Try it out! hope it helps!

try {
    do {
        number = scanner.nextInt();

        if (!Character.isAlphabetic(number)) {
            if (number > simptoms.length) {
                System.out.println("Error, choose again");
                System.out.println("Please enter number!");
            }
        }
    } while (number != -1);
} catch (InputMismatchException e) {
    System.out.println("Enter number");
}