Question

This is a java assignment Please help me

Write the body of the fileAverage() method. Have it open the file specified by the parameter, read in all of the floating point numbers in the file and return their average (rounded to 1 decimal place).

For the testing system to work, don't change the class name nor the method name.

Additionally, the file will have different contents during testing.

public class Main {
public double fileAverage( String filename ){
  
}
  
public static void main( String[] args ){
Main obj = new Main();
System.out.println( obj.fileAverage( "numbers.txt") );
}
}

Answer 1

import java.io.*;
import java.util.Scanner;

public class Main {
  public double fileAverage( String filename ){
    Scanner sc = null;
    try {
      sc = new Scanner(new File(filename));
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
    float f;
    int count = 0;
    double sum = 0;
    while(sc.hasNextDouble()){
      f = sc.nextFloat();
      sum += f;
      count += 1;
    }
    return sum/count;
  }

  public static void main( String[] args ){
    Main obj = new Main();
    System.out.println( obj.fileAverage( "numbers.txt"));
  }
}

numbers.trt :

1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4

Output:

2.5

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