Q4(Practical).java

Q4 - Create an Exception subclass UnderAge, which prints “Under Age” along with the age value when an object of 
UnderAge class is printed in the catch statement. Write a class exceptionDemo in which the method test() throws 
UnderAge exception if the variable age passed to it as argument is less than 18. Write main() method also to show working of the program.
  
  
/**** UnderAge.java ****/
public class UnderAge extends Exception {
final private int age;
public UnderAge(int age) {
this.age = age;
}
@Override
public String getMessage() {
return "UnderAge: " + age + " is less than 18";
}
}
/**** exceptionDemo.java ****/
import java.util.Scanner;
class exceptionDemo {
static void test(int age) throws UnderAge {
if (age < 18)
throw new UnderAge(age);
}
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter Age: ");
int age = sc.nextInt();
try {
test(age);
System.out.println("Test Successful");
} catch (UnderAge e) {
System.err.println(e.getMessage());
System.out.println("Test Unsuccessful");
} finally {
sc.close();
}
}
}


Output -
  
Case 1: Age is lesser than 18

Enter Age: 17
UnderAge: 17 is less than 18
Test Unsuccessful
  
Case 2: Age is not lesser than 18
  
Enter Age: 19
Test Successful