Question

Java

Create an object that will read from a file: The file name is: yourNameln.txt Example: JeanIn.txt Your input file contains integers. 3/3 You will read in the numbers until end of input file; and calculate the average of all the numbers. 10/10

Answer 1

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;

public class Abc
{
public static void main(String[] args) throws FileNotFoundException, IOException
{
try
{
String fileName = "In.txt"; //File to be read
File file = new File(fileName); // File object
FileInputStream fis = new FileInputStream(file); //FileInputStream used to connect to file
InputStreamReader isr = new InputStreamReader(fis); // file data read
BufferedReader br = new BufferedReader(isr); // data put in the buffer

String line;
int sum=0,count=0;
while(true)
{
line=br.readLine(); // read line by line the file
if(line==null) // when there is end of file it returns null
{
break;
}
int num=Integer.parseInt(line);
sum+=num; // calculate sum of all numbers in every iteration
count++; // count the number of integers
}
if(count!=0) // if file not empty print the average
System.out.println("Average of all the numbers is "+(double)sum/count);
else // if file empty write the message
System.out.println("File Empty");
br.close();
}
catch(Exception e)
{
System.out.println(e);
}
}
}