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Java Tutorial : Java Exception handling (Custom Exception or User defined Exception-Version1)

InvalidAgeException.java

public class InvalidAgeException extends Exception
{

    public InvalidAgeException(String message)
    {
        super(message);
    }

}

public class CustomExceptionDemo
{

    public static void main(String[] args)
    {
        try
        {
            CustomExceptionDemo customExceptionDemo = new CustomExceptionDemo();
            customExceptionDemo.validate(15);
        }
        catch (InvalidAgeException invalidAgeException)
        {
            invalidAgeException.printStackTrace();
            System.out.println("message = "+invalidAgeException.getMessage());
        }

    }

    public void validate(int age) throws InvalidAgeException
    {
        if (age < 25)
        {
            throw new InvalidAgeException("Not a valid age to apply for Govt. jobs");
        }
        else
        {
            System.out.println("Valid age to apply for Govt. jobs");
        }

    }
}