Question

Problem: Use the code I have provided to start writing a program that accepts a large file as input (given to you) and takes all of these numbers and enters them into an array. Once all of the numbers are in your array your job is to sort them. You must use either the insertion or selection sort to accomplish this.

Input: Each line of input will be one item to be added to your array.

Output: Your output will be a file that is your sorted list.

Sample Input File:

65

3

91

12

Sample Output File:

3

12

65

91

Program

 package Lab02;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.util.Scanner;

public class Lab02 {
        int[] list;

        public static void main(String[] args) throws FileNotFoundException {
                new Lab02();
        }

        public Lab02() throws FileNotFoundException {
                readInFile(countLinesInFile());

                sort();

                printFile();
        }

        private void sort() {
                // TODO: YOUR CODE GOES HERE

        }

        private void printFile() throws FileNotFoundException {
                File outFile = new File("answer.txt");
                FileOutputStream outFileStream = new FileOutputStream(outFile);
                PrintWriter outStream = new PrintWriter(outFileStream);

                for (int i = 0; i < list.length; i++) {
                        outStream.println(list[i]);
                }

                outStream.close();
        }

        private int countLinesInFile() {
                Scanner file = null;
                try {
                        file = new Scanner(new File("input.txt"));
                } catch (FileNotFoundException e) {
                        System.out.println("System Error, exiting the program!");
                        System.exit(0);
                }

                int count = 0;
                while (file.hasNextLine()) {
                        if (file.nextLine().equals("#"))
                                break;
                        count++;
                }
                return count;
        }

        private void readInFile(int count) {
                Scanner file = null;
                try {
                        file = new Scanner(new File("input.txt"));
                } catch (FileNotFoundException e) {
                        System.out.println("System Error, exiting the program!");
                        System.exit(0);
                }

                list = new int[count];
                for (int i = 0; i < list.length; i++) {
                        list[i] = file.nextInt();
                }
        }
}

Answer 1

If you have any doubts,p lease give me comment...

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.PrintWriter;

import java.util.Scanner;

public class Lab02 {

    int[] list;

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

        new Lab02();

    }

    public Lab02() throws FileNotFoundException {

        readInFile(countLinesInFile());

        sort();

        printFile();

    }

    public void sort() {

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

            for (int j = i + 1; j < list.length; j++) {

                if (list[i] > list[j]) {

                    int temp = list[i];

                    list[i] = list[j];

                    list[j] = temp;

                }

            }

        }

    }

    private void printFile() throws FileNotFoundException {

        File outFile = new File("answer.txt");

        FileOutputStream outFileStream = new FileOutputStream(outFile);

        PrintWriter outStream = new PrintWriter(outFileStream);

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

            outStream.println(list[i]);

        }

        outStream.close();

    }

    private int countLinesInFile() {

        Scanner file = null;

        try {

            file = new Scanner(new File("input.txt"));

        } catch (FileNotFoundException e) {

            System.out.println("System Error, exiting the program!");

            System.exit(0);

        }

        int count = 0;

        while (file.hasNextLine()) {

            if (file.nextLine().equals("#"))

                break;

            count++;

        }

        return count;

    }

    private void readInFile(int count) {

        Scanner file = null;

        try {

            file = new Scanner(new File("input.txt"));

        } catch (FileNotFoundException e) {

            System.out.println("System Error, exiting the program!");

            System.exit(0);

        }

        list = new int[count];

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

            list[i] = file.nextInt();

        }

    }

}