Question

Using JAVA

For this assignment, you will analyze code that uses a file input stream and a file output stream.

Read through the linked Java™ code.

In a Microsoft^® Word document, answer the following questions:

• Could this program be run as is? If not, what is it lacking?
• Does this program modify the contents of an input stream? In what way?
• What are the results of running this code?

********************************************** CODE TO ANALYZE  ********************************************************

/**********************************************************************
*   Program:   Datasort
*   Purpose:    Java code that sorts, extracts data and saves it to a collection
*   Programmer:   I am student          
*   Class:       PRG/421r13, Java Programming II          
*   Instructor:              
*   Creation Date:   12/01/2017  
*
* Comments:
* Extracts data from a file, sorts it, displays it onscreen, and saves it.
*
***********************************************************************/

// import the needed classes

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;


public class Datasort {

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

File fin = new File("e:\\input.txt");   // input file on e: drive (with data)   
File fout = new File("e:\\sorted.txt");   // create an out file on e: drive

// Java FileInputStream class obtains input bytes from a file
FileInputStream fis = new FileInputStream(fin);  
FileOutputStream fos = new FileOutputStream(fout);

// buffering characters so as to provide for the efficient reading of characters, arrays, and lines
BufferedReader in = new BufferedReader(new InputStreamReader(fis));
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(fos));

// declare an array in-line, ready for the sort

String aLine;
ArrayList<String> al = new ArrayList<String> ();

int i = 0;
while ((aLine = in.readLine()) != null) {
// set the sort for values is greater than 0
   if (!aLine.trim().startsWith("-") && aLine.trim().length() > 0) {
       al.add(aLine);
       i++;
           }
       }

Collections.sort(al);   // sorted content to the output file
for (String s : al) {
System.out.println(s);
   out.write(s);
   out.newLine();
   out.newLine();
   }
// close the 2 files
       in.close();
       out.close();
   }
}

Answer 1

1)

Ans:- This program runs and executed successfully but only works for string data not for integer data.

for example file contains only integer data then

/**********input.txt**************/

12
132
0
34
-5
7
344
654
98


/**********************output*********************/

0
12
132
34
344
654
7
98

Ans:- it will ignore the line in the file that length is zero and start with "-" character. if line contains extra space then trim the spaces of the line and put it into the array list of string type and sort it.

Q3)

/*********************input.txt***********************/

Jugal Kishor
Virat Kohli
MS Dhoni
-JKS
Thanks

/*********************output************************/

Jugal Kishor
MS Dhoni
Thanks
Virat Kohli

Please let me know if you have any doubt or modify the answer, Thanks :)