Get organization name from mac address prefix. compile and run "java ListFile <mac address prefix(multiple)>. file:https://drive.google.com/file/d/16a1oCASZcM6NUU7t2dVKYFYi4D9_kvKY/view?usp=sharing

ListFile.java

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;

public class ListFile {
    String fileName = "address_book.txt";
    List<String> list;

    ListFile() {
        try {
            Path path = Paths.get(fileName);
            list = Files.readAllLines(path);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    int getSize() {
        return list.size();
    }

    String getAddr(int index) {
        return list.get(index).substring(0, 6);
    }

    String getOrgName(int index) {
        String name = "[NO MATCHES]";
        if(index > 0)
             name = list.get(index).substring(11);
        return name;
    }
    
    int find(String x) {
        int low = 0;
        int high = list.size() - 1;
        int mid;

        while (low <= high) {
            mid = (low + high) / 2;

            if (getAddr(mid).compareTo(x) < 0) {
                low = mid + 1;
            } else if (getAddr(mid).compareTo(x) > 0) {
                high = mid - 1;
            } else {
                return mid;
            }
        }

        return -1;
    }

    int stringCompare(String str1, String str2) { 
        int l1 = str1.length(); 
        int l2 = str2.length(); 
        int lmin = Math.min(l1, l2); 
  
        for (int i = 0; i < lmin; i++) { 
            int str1_ch = (int)str1.charAt(i); 
            int str2_ch = (int)str2.charAt(i); 
  
            if (str1_ch != str2_ch) { 
                return str1_ch - str2_ch; 
            } 
        } 
  
        if (l1 != l2)
            return l1 - l2; 
        else
            return 0; 
    } 
    public static void main(String[] args) {
        ListFile lf = new ListFile();
        for(String addr: args)
            System.out.println(lf.getOrgName(lf.find(addr)));
    }
}