parser.java

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;

public class parser {
    public static Integer[] getId(String nameGoal) {
        ArrayList<Integer> ids = new ArrayList<Integer>();
        try {
            BufferedReader in = new BufferedReader(new FileReader("C:\\Users\\John\\IdeaProjects\\Example\\src\\npcList.txt")); //Java doesn't like referencing local files so you need the full path

            String readLine = "";
            do {
                try {
                    readLine = in.readLine();
                    if (readLine != null) {
                        if (readLine.contains(" - ")) {
                            String[] arr = readLine.split("-", 2);
                            String name = arr[1];
                            if (name.trim().toLowerCase().equals(nameGoal.trim().toLowerCase())){

                                int id = Integer.parseInt(arr[0].trim());
                                ids.add(id);
                            }
                        }
                    }
                } catch (IOException io) {
                    io.printStackTrace();
                }
            }
            while (readLine != null);

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        Integer[] idArr = new Integer[ids.size()];

        return ids.toArray(idArr);
    }

    public static void main(String args[]) {
        for(Integer i : getId("nex"))
            System.out.println(i);
    }

}