throws FileNotFoundException. try/catch. n OUTPUT SAMPLE #1 for input.txt 1 OUTP

Question

throws FileNotFoundException. try/catch. n OUTPUT SAMPLE #1 for input.txt 1 OUTPUT SAMPLE #1 for input.txt 3 4 5 6 x x x 8 12 x x 34 x x 10 3 4 5 6 xx x 8 12 x x 34 x x 10 20 20 Number 1 is 1 Please input the name of the file Number 2 is: 2 to be opened input. tx Number 3 is 3 File Not Found Number 4 is 4 OUTPUT SAMPLE #2 for input.txt 1. Number 5 is: 5 2 3 4 5 6 x x x 8 12 x x 34 x x 10 Number 6 is: 6 20 Number 7 is: Please input the name of the file Number 8 is 12 to be opened input.txt Number 9 is 34 Number 1 is 1 Number 10 is: 10 Number 2 is 2 Number 11 is 20 Number 3 is: 3 The average of 11 numbers/file Number 4 is: 4 9.55 Number 5 is: 5 Number 6 is 6 OUTPUT SAMPLE #2 for input.txt xxxxx x x x x xx Number 7 is Number 8 is 12 X X X X X The file doesn't contain any Number 9 is 34 integers. Exit program Number 10 is: 10 Number 11 is 20 The average of 11 numbers/file 9.55 OUTPUT SAMPLE #3 for input.txt xxxxx x x x x xx X X X X X Please input the name of the file to be opened input.txt The file doesn't contain any integers Exit program

Explanation / Answer

import java.io.File;

import java.io.IOException;

import java.io.ClassNotFoundException;

public class Average

{

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

{

File infile = new File(" input.txt");

FileReader ins=null;

int sum =0;

int count =0;

int ch;

try {

while (( ch = ins.read())! = -1)

{

for (int i=0; i< ins.length;i++)

{ System.out.println(" Number #" +i "is:" (int)ch);

sum+=Interger.valueOf(ins.trim());

count++;

}

System.out.println("The average of" +count "numbers/file="+((double)sum/count));

}

catch (IOException ioe)

{ System.out.print(ioe);

System.out.print("The file doesn't contain any intergers. Exit program!");

System.exit(-1);

}

catch (ClassNotFoundException cnf)

{ System.out.print(" Please input the file name to be open");

}

}

}

here what I m doing is reading data with FileReader and displaying it on console. Please note that input.txt file already exists in your computer. Then I took sum and count variables where I directly get the sum of all the integers and as well as count the number of integers. I use trim() method to trim the space in between the variables. Then I calculate the average by simply dividing sum by count and displaying the same by converting it into double from integer. I m using try and catch blocks to catch the CNF and IO exceptions and exiting my program if the input file does not contain any integer value.

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