Question

1. Create a program with the exception example code from Hour14Exceptions.java

1. the Hour14Exceptions shows examples of string and number exception handling, as well as a user defined exception
2. CREATE A NEW PROGRAM that demonstrates Any 2 of the following 3 choices:
   1. 1 numeric and 1 string exception
   2. make the program require 1 input argument and throw an exception if there are no command line arguments passed in.
      1. In the exception, inform the user that an input argument is required. (You can go further, and require a numeric in put, and throw an exception if a non numeric string is passed in)
   3. Create your own user defined exception, COMMENT it well, and add code so that it is thrown.
   4. COMMENTS ARE REQUIRED IN THE CODE TO EXPLAIN WHAT IS HAPPENING OR IT WILL BE MARKED INCOMPLETE

__________________________________________________________________________

The Hour14Exceptions.java Code

package hour14exceptions;

//user defined exception accepts string as input
class MyException extends Exception
{
public MyException(String s)
{
// Call constructor of parent Exception
super(s);
}
}

class MyException_Demo
{
public static void main(String args[])
{
   //divide by 0; arithmetic exception
try {
int n1 = 30, n2 = 0;
int n3 = n1/n2;
System.out.println ("Answer=" + n3);
}
catch(ArithmeticException e) {
System.out.println ("ArithmeticException");
}

   //null string pointer (would work for any bad pointer)
try {
String mys = null; //no data in string
System.out.println(mys.charAt(0));
}
catch(NullPointerException e) {
System.out.println("NullPointerException");
}

//string character index out of bounds exception
try {
String mysoob = "Test for out of bounds character access";
char myc = mysoob.charAt(99);
System.out.println(myc);
}
catch(StringIndexOutOfBoundsException e) {
System.out.println("StringIndexOutOfBoundsException");
}

//array index out of bounds exception
try{
int myarray[] = new int[20];
myarray[20] = 9; // last element of array is [19]
}
catch(ArrayIndexOutOfBoundsException e){
System.out.println ("ArrayIndexOutOfBoundsException");
}
try {
// convert non numeric string to number = format exception
int mynum = Integer.parseInt ("qwerty") ;
System.out.println(mynum);
}
catch(NumberFormatException e) {
System.out.println("NumericFormatException");
}

//custom exception
try
{
for (int idx = 0; idx < 6; ++idx)
{
switch (idx)
{
//all 'even' values are acceptable
case 0:
case 2:
case 4:
System.out.println("EvenValue=" + idx);
break;
  
case 1:
case 3:
case 5:
// Throw an object of user defined exception on 3 only
if (idx == 3)
throw new MyException("String to print with user information = " + idx);
else
System.out.println("OddValue=" + idx);
break;
}
}
}
catch (MyException e)
{
System.out.println("User exception caught!!!");
// Print the message from MyException object
System.out.println(e.getMessage());
}
}
}

Answer 1

Code:

package assignment;
import java.util.Scanner;
class SI extends Exception{
   public SI(String s)
   {
   // Call constructor of parent Exception
   super(s);
   }}
public class Hour14Exceptions{
   static void validate(int age)throws SI{
   if(age<18)
   throw new SI("not valid");
   else
   System.out.println("welcome to vote");
   }
   public static void main(String[] args) {
       // TODO Auto-generated method stub
       Scanner sc=new Scanner(System.in);
       System.out.println("choose the Exception");
       System.out.println("1. String Exception");
       System.out.println("2. numeric Exception");
       System.out.println("3. Exit");
       int n=sc.nextInt();
       switch(n) {
       case 1:
           try
       {
       // Throw an object of user defined exception
       throw new SI("Mouni"); }
       catch (SI ex){          
       System.out.println(ex.getMessage()); //// Print the message from SI object
       }
           break;
       case 2:
           try{
           validate(13);}//throws the user defined Exception
                       catch(Exception m){System.out.println("Exception occured: "+m);}
           break;
       case 3:break;
       }}}

Note:***I hope your happy with my answer****If you like my answer please give me upvote***Thank you.....