11.Throwexample.java

/*Question - 
 User define exception , try catch blocks , Throw example in Java*/

//Code-
import java.util.Scanner;
class UserDefinedException extends Exception{
  String ms;
  UserDefinedException()
  {
  }
  UserDefinedException(String ms)
  {
    this.ms = ms;
  }
  @Override
  public String toString()
  {
    return "Invalid! UserDefinedException :" + ms;
  }
}
public class throwexample {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    System.out.println("Enter a number :");
    try
    {
      int num = sc.nextInt();
      try
      {
        if(num < 0)
        {
          throw new UserDefinedException("Number is negative");
        }
        else if(num >= 0 && num <= 25)
        {
          throw new UserDefinedException("Number is in the range of 0-25");
        }
      }
      catch (UserDefinedException e){System.out.println(e);}
      finally
      {
        System.out.println("The number entered by the user is: " + num); //this code is always executed
      }
    }
    catch (Exception e)
    {
      System.out.println(e);
    }
  }
}