Question

Exception handling is a powerful tool used to help programmers understand exception errors. This tool separates the error handling routine from the rest of the code. In this application, you practice handling exception errors. You use sample code that was purposefully designed to generate an exception error, and then you modify the code so that it handles the errors more gracefully.

For this Assignment, submit the following program:

The following code causes an exception error:

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class Ex02 {

    public static void main(String[] args) throws IOException {

        BufferedReader userInput = new BufferedReader
            (new InputStreamReader(System.in));

        ArrayList<String> myArr = new ArrayList<String>();
        myArr.add("Zero");
        myArr.add("One");
        myArr.add("Two");
        myArr.add("Three");        
        System.out.println(myArr.get(7));
               
    }
}

Starting with this provided code, add the following functionality:

1. Use a Try/Catch block so that the exception is caught and the program exits a bit more gracefully. Save this file as TryCatch.java. (Be sure to rename the Public Class accordingly.)
2. Starting with the provided code again (without the Try/Catch block), fix the code so that it runs correctly. That is to say, it should display the last item in the ArrayList. Save this file as Fixed.java. (Be sure to rename the Public Class accordingly.)

Compile, run, and check the results.

Submit the following:

3. The source file for each of the classes created (If more than one file has been created, zip them into one .zip file for posting.)
4. An MS .doc file with explanations/comments of your solution and the results of a test run, including a screen shot picture

Answer 1

TryCatch.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class TryCatch {

   public static void main(String[] args) throws IOException {

       try {
           BufferedReader userInput = new BufferedReader(new InputStreamReader(System.in));

           ArrayList<String> myArr = new ArrayList<String>();
           myArr.add("Zero");
           myArr.add("One");
           myArr.add("Two");
           myArr.add("Three");
           System.out.println(myArr.get(7));
       } catch (Exception e) {
           System.out.println("Exception caught:");
       }

   }
}

============================================================
SEE OUTPUT




=======================================================

Fixed.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;

public class Fixed {

public static void main(String[] args) throws IOException {

BufferedReader userInput = new BufferedReader
(new InputStreamReader(System.in));

ArrayList<String> myArr = new ArrayList<String>();
myArr.add("Zero");
myArr.add("One");
myArr.add("Two");
myArr.add("Three");
System.out.println(myArr.get(3));

}
}

===============================================================

SEE OUTPUT

Thanks, PLEASE COMMENT if there is any concern.