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Thread: ArrayList Boolean Issue

  1. #1
    Junior Member kite98765's Avatar
    Join Date
    Jan 2010
    Thanked 0 Times in 0 Posts

    Red face ArrayList Boolean Issue

    Hello everyone!

    I was busy writing an application program with mulitple classes, and it deteremines if a applicant is approved or not is like an application database. I was running through the first two options, and noticed that a boolean was returning incorrectly. I know this is simple, but the coding looks fine to me. Here's the ApplyList class code that puts everything an applicant says into ArrayLists:
     import java.util.ArrayList;
    public class ApplyList {
    		Applicant app = new Applicant();
    		static ArrayList <String> FirstName = new ArrayList <String>();
    		static ArrayList <String> LastName = new ArrayList <String>();
    		static ArrayList <String> SSN = new ArrayList <String>();
    		static ArrayList <String> Approved = new ArrayList <String>();
    		static String temp;
    		static String temp1;
    		static String temp2;
    		static String temp3;
    	public void List() {
    		for(int q = 0; q <FirstName.size(); q++){
    			System.out.println((q + 1) +". " + FirstName.get(q) + " " +
    					LastName.get(q) + " " + SSN.get(q) + " " + Approved.get(q));

    Here's the Applicant Class, where the information is inputted:
     import java.util.*;
    public class Applicant {
    	public static String Firstname;
    	public static String Lastname;
    	public static String SSN;
    	public static String Married;
    	public static boolean pending;
    	int income, age, approval;
    	public static int run = 0;
    	public void App(){
    		Scanner indata = new Scanner(System.in);				
    		System.out.println("Please enter your first name: ");
    		Firstname = indata.next();		
    		System.out.println("Please enter your last name: ");
    		Lastname = indata.next();
    		System.out.println("Please enter your Social Security Number: ");
    		SSN = indata.next();
    		System.out.println("Please enter your yearly income: ");
    		income = indata.nextInt();
    		System.out.println("Please enter your marital status(Y/N): ");
    		Married = indata.next();
    		System.out.println("Please enter your age: ");
    		age = indata.nextInt();
    		if(Married.equals("y") || Married.equals("Y")){
    		income += 5000;
    		approval = (income / 1000)/ age;
    	void Approve(){
    		pending = Yes();
    	public boolean Yes(){
    			return (approval >= 1.0);

    And finally here's the main class that runs everything:
     import java.util.*;
    public class ApplicationCenter {
    	 * @param args
    	public static void main(String[] args) {
    		// TODO Auto-generated method stub
    		Scanner indata = new Scanner(System.in);
    		ApplyList list = new ApplyList();
    		Applicant app = new Applicant();
    		int selection = 0;
    		String choice;
    			System.out.println("1. Add an applicant");
    			System.out.println("2. Search applicants by Social Security Number");
    			System.out.println("3. View a list of all applicants");
    			System.out.println("4. View a list of approved applicants");
    			System.out.println("5. View a list of declined applicants");
    			System.out.println("6. Exit the Application Database");
    			selection = indata.nextInt();
    			case 1 : System.out.println("You've decided to fill out an application.");
    			case 2 : System.out.println("You've decided to search for an applicant by Social Security Number.");
    					System.out.println("Please enter the Social Security Number you would like to search: ");
    					choice = indata.next();
    					int location = Collections.binarySearch(ApplyList.SSN, choice);
    					if(location >= 0){
    						System.out.println("Applicant found: ");
    						System.out.println((ApplyList.FirstName.get(location)) + " " + 
    							(ApplyList.LastName.get(location)) + ", " + ApplyList.SSN.get(location) + 
    							", Status: ");
    						if("Y".compareTo(ApplyList.Approved.get(location)) == 0){
    			case 3 : System.out.println("You've decided to view a list of all applicants.");
    					for(int q = 0; q < ApplyList.FirstName.size(); q++){
    						System.out.println((q + 1) +". " + ApplyList.FirstName.get(q) + " " +
    						ApplyList.LastName.get(q) + " " + ApplyList.SSN.get(q) + " " + ApplyList.Approved.get(q));

    Thanks in advance for any help you can give.

  2. #2
    Join Date
    Aug 2009
    Thanked 3 Times in 2 Posts

    Default Re: ArrayList Boolean Issue

    Your structure seems a little confusing.
    First of, you should generaly aim to avoid using static fields and objects. While it is usefull at times, OOP is exactly aiming to avoid this as much as possible.
    A solution could be include storing each application in an Arraylist object, like this ArrayList<Applicant>.
    As far as I can see, the only place the applicant is stored is in the app field in ApplicationCenter class. So if you use selection one, you overwrite existing data in that field.

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