Creating a personal exception class.

[Zoralink23]

We're supposed to create a program for a class wherein it accepts an input for an age, then if the age is less than 0 throws an exception and stops the program. I cannot figure out how exception classes work for the life of me. Any help on where I'm going wrong? Thanks!

import java.util.Scanner;

public class A {


	public static void checkAge(int age) throws Exception{
		if(age < 0){
			ageException b = new ageException("Invalid.");
		}
	}
	
	public static void main(String[] args) throws Exception {
		A a = new A();
		Scanner keyboard = new Scanner(System.in);
		System.out.print("Enter your age: ");
		int age = 0;
		try{ 
			age = keyboard.nextInt();
			checkAge(age);
		}
		catch (ageException b) {
			System.out.println(b.v);
		}
			System.out.println("Thanks. You say you are "+ age + " years old.");
	}

}

Exception:

public class ageException extends Exception {
	
	String v;

	public ageException(){
		
	}
	ageException(String z){
		String v = z;
	}
	
	public static void main(String[] args) {
		
	}

}

[quad64bit]

Your overloaded constructor on line 8 is missing the the scope - it should also be public. In your checkAge method, you need to throw a new exception:

throw new ageException("My message here");

Also, this is just a style note (but an important one), your class names should never start with a lowercase letter - lowercase is reserved for methods, variables, and key words.