I have written a Java code for zoo monitoring but for some reason I keep getting error messages when I run it. I am using Java Net Beans IDE to build the program. Could someone please help me so that I can get this to work properly in Net Beans IDE?

 

import java.io.IOException;

import java.util.List;

import java.util.Scanner;

import javax.swing.JFrame;

import javax.swing.JOptionPane;

 

//<editor-fold defaultstate="collapsed" desc="comment">

//</editor-fold>

public class ZooMonitoringSystem {

 

  @SuppressWarnings("empty-statement")

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

   //main() function will allow user to choose something to monitor.

    //regrdless of which is chosen the program will open a file, save each line

    //to a list then search the list for details on while keeping track of wherevr it is

    // on the list. It will the prompt the user for a specific animal and continue searching the

    //list from where it left of to the end...while outputing the things it finds relevant

 

    //while statement allows the user to return to main menu after completion

    while (true) {

      System.out.println("What would you like to monitor? ");

      System.out.println("Enter 1 to monitor Animals ");

      System.out.println("Enter 2 to monitor Habitats ");

      System.out.println("Enter 3 to Exit");

      int userInput = 0;

      // scanner reads input from user

      Scanner sc = new Scanner(System.in);

      userInput = sc.nextInt();

      // a variable to keep track of where we are searching in the file

      int write = 0;

      String animalName;

      String habitatName;

      //if the input from the user is the number 1

      if (userInput == 1) {

        System.out.println("List of Animals ");

        //calls from animals file

        Reader rd = new Reader("ANIMALS.txt");

       //rd.get() will store all contents of animals file into a list

        // the list's elements are each of the lines of the file

        List<String> list = rd.get();

        // a for loop to go through the list

        for (String line : list) {

          // if an element (line) in the list contains the words "Details on"

          if (line.toLowerCase().contains("Details on".toLowerCase())) {

            //increase the write variable that tracks the index of the list

            write = write + 1;

            //print out every line that has "details on" substring

            System.out.println(line);

          }

 

        }

        //allow user to input an animal's name for searching

        System.out.println("Enter name of animal you would like to monitor: ");

        animalName = sc.next();

        for (String category : list.subList(write, list.size()))//specific range within the list (From where we stopped searching as tracked by the write variable, to the end of the list) {

        //search for an animal in the list

        {

          if (category.toLowerCase().contains(animalName.toLowerCase())) {

            write = list.indexOf(category);

            // if an animal is found, then the next 5 elements in the list (next 5 lines in the file)

            // are info about the animal

            for (int i = write; i < write + 5; i++) {

              //displays alert message if file contains ******--indicating abnormal detection

              //check first if the line in the for loop contains ***

              if (list.get(i).contains("*****")) {

                JOptionPane.showMessageDialog(new JFrame(), list.get(i), "ALERT!!!", JOptionPane.ERROR_MESSAGE);

                break;

 

              } //if the line in the for loop doesn't contain a **** then print it printed 

              else {

 

                System.out.println(list.get(i));

              }

            }

 

          }

        }

 

      } else if (userInput == 2) {

        System.out.println("List of Habitats ");

        //calls from habitats file

        Reader rd = new Reader("HABITATS.txt");

                //rd.get() will store all contents of habitats file into a list

        // the list's elements are each of the lines of the file

        List<String> list = rd.get();

        //loop through the whole list

        for (String line : list) {

          //search for "details on" in the list's elements

          if (line.toLowerCase().contains("Details on".toLowerCase())) {

            //maintain the position of the line being searched using the write variable

            write = write + 1;

            //print out every line that has "details on" substring

            System.out.println(line);

 

          }

        }

 

        System.out.println("Enter the name of a habitat you would like to monitor: ");

        //ask user for a habitat name

        habitatName = sc.next();

          // search for a habitats beginning from where we left of our search as tracked by the write variable

        //we use sublist() to separate already searched items 

        for (String res : list.subList(write, list.size())) {

          //check if line contains a habitat name

          if (res.toLowerCase().contains(habitatName.toLowerCase())) {

            write = list.indexOf(res);

                  // if a habitat is found, then the next 4 elements in the list (next 4 lines in the file)

            // are info about the habitat

            for (int i = write; i < write + 4; i++) {

              //check if the line to be printed contains "****"

              if (list.get(i).contains("*****")) {

                //raise Alert box

                JOptionPane.showMessageDialog(new JFrame(), list.get(i), "ALERT!!!", JOptionPane.ERROR_MESSAGE);

                break;

              } //if the line in the for loop doesn't contain a **** then print it printed

              else {

                System.out.println(list.get(i));

              }

            }

          }

 

        }

 

      } //if the user chooses the third choice

      else if (userInput == 3) {

        //close the scanner

        sc.close();

        //exit the system

        System.exit(0);

      }

    }

 

  }

}