User-defined Exception.java

// To see if entered number is 5, 6 or 7
import java.util.*;

class NumberException extends Exception 
{
    NumberException(String str) 
    {
        super(str);
    }
}

class Handle 
{
    public static void main(String a[]) 
    {
        int s = 0;
        boolean continueInput = true;
        do 
        {
            try 
                {
                Scanner sc = new Scanner(System.in);
                System.out.println("\nEnter the number");
                s = sc.nextInt();
                if (s == 5 || s == 6 || s == 7) 
                {
                    System.out.println("Valid input");
                } 
                else 
                {
                    NumberException e = new NumberException("Incorrect Input. Please try again.");
                    throw e;
                }
                continueInput = false;
            } catch (NumberException e) {
                System.out.println("Exception is : " + e);
            }
        } 
        while (continueInput);
    }
}