Question

I have a issue i can’t get it to work now let going to the point a explain in the code thanks.

This is my class: what I want to do is insert the Integers sort the list and buffer writer in a column with out coma. Now I getting this:
[1110018, 1110032, 1110056, 1110059, 1110063, 1110085, 1110096, 1110123, 1110125, 1110185, 1110456, 1110459]

I want like this:
111xxxxx
111xxxx
xxxx…….

I can’t do it in single array, have to be in ArrayList.
This is my collecting:
list.addNumbers(numbers);
list.display();

This is my writer: Is buffered
coma.write(“\n”+list.display());

coma.flush();

**public class IdCount {
private ArrayList properNumber = new ArrayList<>();

 public void addNumbers(Integer numbers) {<br/>
properNumber.add(numbers);**<br/>  

Collections.sort(properNumber);
}
public String display() {
(I try .toString() Not work)
return properNumber.toString();

      }**  

My second issue is LineNumberReader: This is my collecting and my writing:
try {
Reader input = new BufferedReader( new FileReader(inputFile));
try (Scanner in = new Scanner(input)) {
while (in.hasNext()) {
(More Code)
asp = new LineNumberReader(input);
int rom = 0;

              while (asp.readLine()!=null){<br/>
                  rom++;<br/>
              }
          System.out.println(rom);<br/>coma.write(rom);<br/>

This one not write anything an my System Print give me only 12 0 in column.
Thank you for the help in advances. Any help it will appreciate.

Answer 1

I want like this:
111xxxxx
111xxxx
xxxx…….

Then in write your display method as follows:

public String display() {
  StringBuilder sb = new StringBuilder();
  Iterator i = properNumber.iterator();
  while(i.hasNext()){
   sb.append(i.next);
   sb.append("\n");
  }

  return sb.toString();
}

Explanation:

What you were doing :

return properNumber.toString(); will return a string that contains all values inside properNumber comma-seperated. so thats why you were getting that output.

What I have done

Made a StringBuilder object so that I can temporarily store the strings before returning all the values.

Then I made a iterator that iterates through properNumber and then append each entry to the StringBuilder object and appending \n after it.

Finally when the iterator completes meaning I have added all entries inside properNumber in StringBuilder object sb. So now I will return the content of sb as String using sb.toString() method.