Type your age: hello
Type your age: ?
Type your age: 3.14
Type your age: 25
Type your GPA: a
Type your GPA: bcd
Type your GPA: 2.5
age = 25, GPA = 2.5

Type your age: hello
Type your age: ?
Type your age: 3.14
25
Type your GPA: a
Type your GPA: bcd
2.5
age = 25, GPA = 2.5

Scanner console = new Scanner(System.in);
System.out.print("Type your age: ");
console.next();
while (!console.hasNextInt()) {
  System.out.print("Type your age: ");
  console.next();
}
int age = console.nextInt();

System.out.print("Type your GPA: ");
console.next();
while (!console.hasNextDouble()) {
  System.out.print("Type your GPA: ");
  console.next();
}
double gpa = console.nextDouble();
System.out.println("age = " + age + ", GPA = " + gpa);