Exception Handling

[link6790]

I'm trying to write a program that throws an exception if the input value is between 0 and 125 using exception errors. I'm not sure where to define the parameters.

import java.util.Scanner;
class InvalidAgeException extends Exception
{
public InvalidAgeException()
{
super("The Age you've entered is not valid");
}
}
class InputAge
{
public static void main(String args[])
{
try
{
Scanner inputdata = new Scanner( System.in );
System.out.print("Enter your name");
inputdata.nextInt();
System.out.print("Now enter your age");
int x = inputdata.nextInt();
}
catch(InvalidAgeException ae)
{
System.out.println("Invalid Age");
}
finally
{
System.out.println("Program Execution Completed");
}
}
}

[JosAH]

Where in your code are you going to throw an InvalidAgeException? I don't see it anywhere.

kind regards,

Jos

[DarrylBurke]

How to Throw Exceptions (The Java™ Tutorials > Essential Classes > Exceptions)

db

edit Now I know I'm getting old :(

[Solarsonic]

Why create an exception? Just have an if statement...

[sunde887]

Also, of you post, please wrap our code in code tags.

[code]
YOUR CODE HERE
[/code]

[link6790]

So now I've got the code in but it says "Exception in thread "main" java.lang.NoSuchMethodError: main"

import java.util.Scanner;
class InvalidAgeException extends Exception
{
	public InvalidAgeException()
	{
		super("The Age you've entered is not valid");
	}
}
class InputAge
{
	public static void main(String args[])
	{
		try
		{
			Scanner inputdata = new Scanner( System.in );
			System.out.print("Enter your name");
			inputdata.nextInt();
			System.out.print("Now enter your age");
			int x = inputdata.nextInt();
			if (x < 0 && x > 125)
			{
				throw new InvalidAgeException();
			}
		}
		catch(InvalidAgeException ae)
		{
			System.out.println("Invalid Age");
		}
		finally
		{
			System.out.println("Program Execution Completed");
		}
	}
}

[Toll]

Is your file called InputAge.java? Also, you need to make the InputAge class public.

[link6790]

now I got the program itself to work, but when i put in an age that is above 125, It doesn't throw an exception.

import java.util.Scanner;
public class InvalidAgeException extends Exception
{
	public InvalidAgeException()
	{
		super("The Age you've entered is not valid");
	}
}
class InputAge
{
	public static void main(String args[])
	{
		try
		{
			Scanner inputdata = new Scanner( System.in );
			System.out.print("Enter your name");
			String str1 = inputdata.nextLine();
			System.out.print("Now enter your age");
			int x = inputdata.nextInt();
			if (x < 0 && x > 125)
			{
				throw new InvalidAgeException();
			}
		}
		catch(InvalidAgeException ae)
		{
			System.out.println("Invalid Age");
		}
		finally
		{
			System.out.println("Program Execution Completed");
		}
	}
}

[Toll]

You're checking to see if the age is below 0 AND above 125. That'd be rather tricky.

[link6790]

so do I have to create two separate exceptions?

[Toll]

While that would work, I think it would be easier to check if the age is below 0 OR above 125.

[link6790]

O...Duh! I can be pretty retarded sometimes...

[link6790]

nvrmnd. It still doesn't work

import java.util.Scanner;
public class InvalidAgeException extends Exception
{
	public InvalidAgeException()
	{
		super("The Age you've entered is not valid");
	}
}
class InputAge
{
	public static void main(String args[])
	{
		try
		{
			Scanner inputdata = new Scanner( System.in );
			System.out.print("Enter your name");
			String str1 = inputdata.nextLine();
			System.out.print("Now enter your age");
			int age = inputdata.nextInt();
			if (age < 0 || age > 125)
			{
				throw InvalidAgeException(age);
			}

		}
		catch(InvalidAgeException ae)
		{
			System.out.println("Invalid Age");
		}
		finally
		{
			System.out.println("Program Execution Completed");
		}
	}
}

[Toll]

What, more precisely, doesn't work? It doesn't throw an exception when you enter 125 as the age?

[JosAH]

nvrmnd. It still doesn't work

public class InvalidAgeException extends Exception
{
	public InvalidAgeException()
	{
		super("The Age you've entered is not valid");
	}
[ ... ]
				throw InvalidAgeException(age);
[ ... ]

You don't have a constructor with a parameter.

kind regards,

Jos

[JosAH]

darn, I replied twice; my keyboard mustn't be properly debounced ...

[link6790]

Not sure exactly what I did to change it but now it works :). Thanks for all your help guys!