Answered! Question: Write a program that reads the integers in the text file integers.dat and: Displays the number of……

ReadIntegers.java

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class ReadIntegers {
public static void main(String[] args) throws FileNotFoundException {

ArrayList<Integer> allInts = new ArrayList<>();
ArrayList<Integer> allEvenInts = new ArrayList<>();
ArrayList<Integer> allOddInts = new ArrayList<>();
Scanner sc = new Scanner(System.in);
System.out.println(“Welcome to Wake’s Integer processing Agency”);
System.out.print(“What is name of the input file?”);
String fileName = sc.next();
readFile(allInts, allEvenInts, allOddInts, fileName);
System.out.println(“The number of integers in the file is ” + allInts.size());
System.out.println(
“There are ” + allOddInts.size() + ” odd integers and ” + allEvenInts.size() + ” even integers”);
System.out.println(“The sum of the odd integers is ” + getSum(allOddInts));
System.out.println(“The sum of the even integers is ” + getSum(allEvenInts));
System.out.println(“The sum of all the integers is ” + getSum(allInts));
Collections.sort(allInts);
int largest = allInts.get(allInts.size() – 1);
int smallest = allInts.get(0);
System.out.println(“The largest integer is ” + largest);
System.out.println(“The smallest integer is “+ smallest);
System.out.println(“The average of “+largest+” and “+smallest+” is “+((largest+smallest)/2.0));
}

public static void readFile(ArrayList<Integer> allInts, ArrayList<Integer> allEvenInts,
ArrayList<Integer> allOddInts, String fileName) throws FileNotFoundException {
Scanner sc = new Scanner(new File(“integers.dat”));
String line;
String[] word;
while (sc.hasNextLine()) {
line = sc.nextLine();
word = line.split(” “);
int x;
for (int i = 0; i < word.length; i++) {
x = Integer.parseInt(word[i]);
allInts.add(x);
if (x % 2 == 0) {
allEvenInts.add(x);
} else {
allOddInts.add(x);
}
}
}
}

public static int getSum(ArrayList<Integer> ints) {
int sum = 0;
for (int i = 0; i < ints.size(); i++) {
sum = sum + ints.get(i);
}
return sum;
}
}

Sample Run: –

Welcome to Wake’s Integer processing Agency
What is name of the input file?integers.dat
The number of integers in the file is 20
There are 11 odd integers and 9 even integers
The sum of the odd integers is 2645
The sum of the even integers is 4390
The sum of all the integers is 7035
The largest integer is 952
The smallest integer is 7
The average of 952 and 7 is 479.5