Converting lines of text from a file to String Array

Question

I read the information in a .txt file and now I would like to store the lines of information from the text into a String Array or a variable.

The information in the .txt file is as given:

Onesimus, Andrea
BAYV
Twendi, Meghan
RHHS
Threesten, Heidi
MDHS

I want to store BAYV, RHHS, MDHS into a different array from the names.

import java.io.File;
import java.util.Scanner;

class testing2 {
 public static void main(String [] args) throws Exception {


File Bayviewcamp = new File ("H:\\Profile\\Desktop\\ICS3U\\Bayviewland Camp\\Studentinfo.txt");
Scanner scanner = new Scanner (Bayviewcamp);

while (scanner.hasNextLine())
  System.out.println(scanner.nextLine());

What have you tried so far? Also, your requirements are not very clear, do you want to store only the uppercase words? — Gabriel Prá, Dec 13 '18 at 14:57
@GabrielPrá No, I want to store the names (e.g Onesimus, Andrea) into an array and the upper case letters into another array — Christian, Dec 13 '18 at 15:00
They are always in that format : Names and next line is value? — Rafał Sokalski, Dec 13 '18 at 15:02
Please read [Under what circumstances may I add “urgent” or other similar phrases to my question, in order to obtain faster answers?](//meta.stackoverflow.com/q/326569) - the summary is that this is not an ideal way to address volunteers, and is probably counterproductive to obtaining answers. Please refrain from adding this to your questions. — halfer, Dec 13 '18 at 19:35

Rafał Sokalski · Answer 1 · 2018-12-13T15:25:00.827

Below code has few restrictions like:

There must be format that you said (name and next line value)
Array size is 100 by default but you can change as you want

By name I mean one line: (Onesimus, Andrea) it's under first index in names array.

private static final int ARRAY_LENGTH = 100;

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

  boolean isValue = false;
  File txt = new File("file.txt");
  Scanner scanner = new Scanner(txt);

  String[] names = new String[ARRAY_LENGTH];
  String[] values = new String[ARRAY_LENGTH];
  int lineNumber = 0;
  while (scanner.hasNextLine()) {
    if (isValue) {
        values[lineNumber / 2] = scanner.nextLine();
    } else {
        names[lineNumber / 2] = scanner.nextLine();
    }
    isValue = !isValue;
    lineNumber++;
  }
  for (int i = 0; i < ARRAY_LENGTH; i++) {
    System.out.println(names[i]);
    System.out.println(values[i]);
  }
}

Below code return separated names:

private static final int ARRAY_LENGTH = 100;

public static void main(String[] args) throws FileNotFoundException {
    boolean isValue = false;
    File txt = new File("file.txt");
    Scanner scanner = new Scanner(txt);

    String[] names = new String[ARRAY_LENGTH];
    String[] values = new String[ARRAY_LENGTH];
    int namesNumber = 0;
    int valuesNumber = 0;
    while (scanner.hasNextLine()) {
        if (!isValue) {
            String tempArrayNames[] = scanner.nextLine().split(",");
            values[valuesNumber++] = tempArrayNames[0].trim();
            values[valuesNumber++] = tempArrayNames[1].trim();
        } else {
            names[namesNumber++] = scanner.nextLine();
        }
        isValue = !isValue;
    }
}

Naghaveer R · Answer 2 · 2018-12-13T15:19:51.167

Check whether names matches with the regex "[A-Z]+"

        List<String> upperCaseList = new ArrayList<>();
        List<String> lowerCaseList = new ArrayList<>();

        while (scanner.hasNextLine()) {
              String[] names = scanner.nextLine().split(",");
              for(String name:names) {
                  if(name.matches("[A-Z]+")) {
                      upperCaseList.add(name);
                  }
                  else {
                      lowerCaseList.add(name);
                  }
              }
        }

As per your example, some of the names has leading spaces. you may have to trim those spaces before you compare with the regex

              for(String name:names) {
                  if(name.trim().matches("[A-Z]+")) {
                      upperCaseList.add(name.trim());
                  }
                  else {
                      lowerCaseList.add(name.trim());
                  }
              }

Converting lines of text from a file to String Array

2 Answers2