Question

In Java.

Create a class called FileSumWrapper with a method that has the signature

public static void handle(String filename, int lowerBound)

Make this method call FileSum.read and make your method catch all the errors.

FileSum.read is a method that takes a filename and a lower bound, then sums up all the numbers in that file that are equal to or above the given lower bound.

FileSum :

import java.io.File;
import java.rmi.UnexpectedException;
import java.util.Scanner;

public class FileSum {

    public static int read(String filename, int lowerBound) throws Exception {
        Scanner inputFile = new Scanner(new File(filename));

        int acc = 0;
        boolean atLeastOneFound = false;
        while (inputFile.hasNext()) {
            int data = inputFile.nextInt();
            if (data >= lowerBound) {
                acc += data;
                atLeastOneFound = true;
            }
        }

        if (!atLeastOneFound) {
            throw new UnexpectedException("");
        }

        return acc;
    }

}

Question1:

import java.util.Scanner;

public class Question1 {

    public static void main(String[] args) {
        Scanner keyboard = new Scanner(System.in);
        System.out.println("Enter a filename");
        String filename = keyboard.nextLine();
        System.out.println("Enter a lower bound");
        int lowerBound = keyboard.nextInt();

        FileSumWrapper.handle(filename, lowerBound);
    }
}

err.txt :

50 40 30
90
85
23
06
30x
54
675
875
34
2323
423
423
5
5
79
97
90y
7986
5
46
64656
66
6
333 93 9 300 20 2 9 209 290 39 48 85 7847 578048

t1.txt:

50 40 30
90
85
23
06
30x
54
675
875
34
2323
423
423
5
5
79
97
90y
7986
5
46
64656
66
6
333 93 9 300 20 2 9 209 290 39 48 85 7847 578048

Here is the input :

t1.txt 50

output:

Enter a filename\n
Enter a lower bound\n
Sum of all numbers in t1.txt is 665177\n

Answer 1

import java.io.File;
import java.rmi.UnexpectedException;
import java.util.Scanner;

class FileSum {

public static int read(String filename, int lowerBound) throws Exception {
Scanner inputFile = new Scanner(new File(filename));

int acc = 0;
boolean atLeastOneFound = false;
while (inputFile.hasNext()) {
int data = inputFile.nextInt();
if (data >= lowerBound) {
acc += data;
atLeastOneFound = true;
}
}

if (!atLeastOneFound) {
throw new UnexpectedException("");
}

return acc;
}

}
//created wrapper class
class FileSumWrapper {
   //create a hanlde method
   // which calles read method in FileSum class
   public static void handle(String filename, int lowerBound){
           try {
               int sum=FileSum.read(filename, lowerBound);
               System.out.println("Sum of all numbers in "+filename+" is "+sum);
           } catch (Exception e) {
               e.printStackTrace();
           }
   }
}
public class Question1 {

public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter a filename");
String filename = keyboard.nextLine();
System.out.println("Enter a lower bound");
int lowerBound = keyboard.nextInt();

FileSumWrapper.handle(filename, lowerBound);
}

}

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