Question

Having trouble with my code, it keeps giving me an error every time I run it. Can someone please help me understand what I'm doing wrong?

*********CODE***************

// Java program to read the file contents, sort it and output the sorted content to another file
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;

public class Datasort {

public static void main(String[] args) throws IOException {
File fin = new File("input.txt"); // input file
File fout = new File("sorted_input.txt"); // 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) {
al.add(aLine);   
}
// set the sort for values is greater than 0
Collections.sort(al); // sorted content to the output file
// writer object of BufferedWriter class to write to the output file
BufferedWriter writer = new BufferedWriter(new FileWriter(fout));
// loop to write the sorted contents to output file
for(i=0;i<al.size();i++)
{
if(i < al.size()-1)
writer.write(al.get(i)+"\n");
else // last line shouldn't end with a new line
writer.write(al.get(i));

}
// close the 2 files   
writer.close();
in.close();
}

}

//end of program

ERROR:

run:
Error: Could not find or load main class datasort.Datasort
Caused by: java.lang.ClassNotFoundException: datasort.Datasort
C:\Users\jonni\AppData\Local\NetBeans\Cache\11.1\executor-snippets\run.xml:111: The following error occurred while executing this line:
C:\Users\jonni\AppData\Local\NetBeans\Cache\11.1\executor-snippets\run.xml:68: Java returned: 1
BUILD FAILED (total time: 0 seconds)

Answer 1

//The program working is fine without any issues:

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;

public class Datasort {

   public static void main(String[] args) throws IOException {
       File fin = new File("input.txt"); // input file
       File fout = new File("sorted_input.txt"); // 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) {
           al.add(aLine);
       }
// set the sort for values is greater than 0
       Collections.sort(al); // sorted content to the output file
// writer object of BufferedWriter class to write to the output file
       BufferedWriter writer = new BufferedWriter(new FileWriter(fout));
// loop to write the sorted contents to output file
       for (i = 0; i < al.size(); i++) {
           if (i < al.size() - 1)
               writer.write(al.get(i) + "\n");
           else // last line shouldn't end with a new line
               writer.write(al.get(i));

       }
// close the 2 files   
       writer.close();
       in.close();
   }

}

Please follow the below instructions:

1) copy the code to notepad

2) delete the file from the netbeans

3)create new file with name Datasort.java

4)copy code from notepad and paste

5) Run the program

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