Question

Can someone please help me? I'm having trouble with this assignment and have been stuck trying to figure it out for over an hour.

Here's the assignment details below:

For this assignment, you will develop "starter" code. After you finish, your code should access an existing text file that you have created, create an input stream, read the contents of the text flie, sort and store the contents of the text file into an ArrayList, then write the sorted contents via an ouput stream to a separate output text file.

Copy and paste the following Java™ code into a JAVA source file in NetBeans:

import java.io.BufferedReader;

import java.io.BufferedWriter;

public class Datasort {

public static void main (String [] args) {

File fin =     // input file

File fout =   // create an out file

// Java FileInputStream class obtains input bytes from a file

FileInputStream fis = new FileInputStream(fin);     

// buffering characters so as to provide for the efficient reading of characters, arrays, and lines

BufferedReader in = new BufferedReader(new InputStreamReader(fis));

// 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

Collections.sort(al);   // sorted content to the output file

{

System.out.println(s);             

}

// close the 2 files                       

}

}

Answer 1

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

public class Datasort {

public static void main (String [] args) {

File fin = new File("input.txt"); // input file

File fout = new File("output.txt"); // create an out file

// Java FileInputStream class obtains input bytes from a file

FileInputStream fis;   
ArrayList<String> al= new ArrayList<String> ();;
try {
fis = new FileInputStream(fin);
// buffering characters so as to provide for the efficient reading of characters, arrays, and lines

BufferedReader in = new BufferedReader(new InputStreamReader(fis));

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

String aLine;

while ((aLine = in.readLine()) != null) {
al.add(aLine);
}   

in.close();
} catch (FileNotFoundException ex) {
System.out.println("File not found");
}
catch (IOException ex) {
System.out.println("File read error");
}

// set the sort for values is greater than 0

Collections.sort(al); // sorted content to the output file

for(int i=0;i<al.size();i++){

// write in console
System.out.println(al.get(i));   

}

// write sorted data in file

FileWriter fileWriter = null;
       BufferedWriter writer = null;
try {
fileWriter = new FileWriter(fout);
  
if(fout.exists()==false){
fout.createNewFile();
}
  
writer=new BufferedWriter(fileWriter);
  
for(int i=0;i<al.size();i++){
// write sorted array data in file
writer.write(al.get(i));
  
// write new in file , except last line
  
if(i<al.size()-1){
writer.write("\n");
}
}
  
writer.close();
fileWriter.close();
  
  
} catch (IOException ex) {
System.out.println("File writing error.");
}

}

}