Exception in thread “main” java.util.InputMismatchException error

I believe I wrote all my code correctly but Im getting this error, can someone help me understand:

Exception in thread "main" java.util.InputMismatchException
at java.base/java.util.Scanner.throwFor(Scanner.java:939)
at java.base/java.util.Scanner.next(Scanner.java:1594)
at java.base/java.util.Scanner.nextDouble(Scanner.java:2564)
at gangPackage.newClass.main(newClass.java:15)

Here is my code:

package gangPackage;
import java.util.*;
public class newClass {
    public static void main (String[] args) {
        Scanner Scan = new Scanner(System.in);
        String name;
        int age;
        double gpa;

        System.out.println("Enter your name: ");
        name = Scan.nextLine();
        System.out.println("Enter students age: ");
        age = Scan.nextInt();
        System.out.println("Enter your GPA: ");
        gpa = Scan.nextDouble();


        System.out.printf(name + " is " + age + " years old. And has a GPA of " + gpa);
    }
}

Answer

Your code looks OK.

An InputMismatchException occurs in a Scanner when a given input doesn’t match the expected input format. Your exception occurs on line 15, where a scanner expects a decimal number such as 3.14 (which, depending on your system’s locale, the decimal can be represented by a dot . or a comma ,!)

If you’re certain that the input you’re providing is absolutely a decimal number, but you’re not sure what locale you’re using, you can force a particular locale by using the useLocale method.

Scanner Scan = new Scanner(System.in).useLocale(Locale.US);