Collection.sort when getting array values from a text file

[NewbieGramer]

Hello all,

I'm currently a Java student. I working on a bank program that gets a user id, name and balance from a text file. I need to be able to sort based on each field. I'm using Collection.sort and Comparator. I'm using String[] array = file.toFile().list(); to get the values for the array from the text file. I can't figure out how to make this into an arraylist. I understand the concept when hardcoding the data but having trouble doing it from a text file.

[Norm]

how to make this into an arraylist.

One way is to have a loop that accesses each element in the array and adds it to the arraylist.
Also the Arrays class has a useful method.

Post the code you are having problems with. Be sure to wrap the code in code tags.

[NewbieGramer]

Here's what I have so far. Thanks in advanced for any help.

public class BankSorter extends JFrame
{
	private static final String String = null;
	private static JTextArea area = new JTextArea(8 , 35);
	private JLabel totLabel = new JLabel("     Total # of Bank Accounts: ");
	private static JTextField totacct = new JTextField(5);
	
	
    public BankSorter()
	{	
       super("Account Sorter");
       acct = new JLabel("  Bank Account Sorter"); 
       acct.setFont(new Font("Ariel", Font.BOLD, 26));	      
       FlowLayout flow = new FlowLayout(); 
       setLayout(flow);
       add(acct);
       
       JCheckBox nameBox = new JCheckBox();
   	   JLabel nameLabel = new JLabel("Name:");
 	   
 	   JCheckBox custBox = new JCheckBox();
	   JLabel custLabel = new JLabel("Customer #:");
 	  
 	   JCheckBox balanceBox = new JCheckBox();
 	   JLabel balanceLabel = new JLabel("Balance:");	  
 	   
 	   JLabel sortLabel = new JLabel("Sort by ");
       	   
 			   
       add(acct);  
 	   add(area);
 	   add(new JScrollPane(area));
   	   add(sortLabel);
 	   add(nameLabel);
 	   add(nameBox);
 	   add(custLabel);
 	   add(custBox);
 	   add(balanceLabel);
 	   add(balanceBox);	  
 	   add(totLabel);
 	   add(totacct);
 	   
 	   nameBox.addItemListener(new ItemListener()
 	   {
 		  public void itemStateChanged(ItemEvent e) 
 		  {
 			  if(nameBox.isSelected())
 			  {
 				 balanceBox.setSelected(false);
 	             custBox.setSelected(false); 
 			  }	
 		   } 
 		} 
 	 );
 	   
 	   custBox.addItemListener(new ItemListener()
	   {
		  public void itemStateChanged(ItemEvent e) 
		  {
			  if(custBox.isSelected())
			  {
				 balanceBox.setSelected(false);
	             nameBox.setSelected(false);
			  }
		  }
	   }
	   );
 	  
 	   balanceBox.addItemListener(new ItemListener()
	   {
		  public void itemStateChanged(ItemEvent e) 
		  {
			  if(balanceBox.isSelected())
			  {
				 nameBox.setSelected(false);
	             custBox.setSelected(false);
			  }
		  }
	   }
	   );		
	}
    
    public class Sort
    {
      private String name;
      private double balance;
      private int idString;
      
      public void Name(String n, double b, int i)
      {
    	  name = n;
    	  balance = b;
    	  idString = i;
      }   
      public String getName()
      {
        return name;
      }
      public double getBalance()
      {
    	  return balance;
      }    
      public int getIdString()
      {
    	  return idString;
      }
      public String toString()
      {
    	  return idString + name + balance;
      }  
    }
	public static void BankFiles()
	{
		Path file = Paths.get("C:\\Java\\Account.txt");

		
		final String EMPTY_ACCT = "0000";
		final String ID_FORMAT = "0000";
		final String NAME_FORMAT = "        ";
		final String BALANCE_FORMAT = "00000.00";	
		
		String temp = "";
		String delimiter = ",";
		String s = ID_FORMAT + delimiter + NAME_FORMAT + delimiter + BALANCE_FORMAT + System.getProperty("line.separator");
		
		String[] array = file.toFile().list();
		
		
		
		
        try
		{
		   InputStream iStream = new BufferedInputStream(Files.newInputStream(file));
		   BufferedReader reader = new BufferedReader(new InputStreamReader(iStream));     

		  while(s != null)
		  {
		    array = s.split(delimiter);
		     if(!array[0].equals(EMPTY_ACCT))
		     { 
		        area.append("Customer #: " + array[0] + "  " + " Name: " + array[1] + "     " + "Balance: " + "       $" + array[2]  + System.getProperty("line.separator"));                   
		     }                               
		        s = reader.readLine();                                          
		   } 
		        reader.close();
		 }
		 catch(Exception e)
	      {
		    System.out.println("Message: " + e);
	      }   
		   totacct.setText(temp);
	}   
	
		    Collections.sort(array, new Comparator<>() {
	            public int compare(array a1, array a2){
	 
	                if(a1.getId() > a2.getId()) {
	                    return 1;
	                }
	                else if(a1.getId() < a2.getId()) {
	                    return -1;
	                }
	                 
	                return 0;
	            }
	        });
	}
		
	public static void main(String[] args)
	{
		BankSorter frame = new BankSorter();		
		frame.setTitle("BankSorter");
		frame.setSize(450, 325);
		frame.setLocationRelativeTo(null);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
		
		BankFiles();
		
	}
}

[Norm]

Do you have any specific questions?

[NewbieGramer]

Yes,
How to make an array list for the balance,name and id from the text file. So, I can complete the collection.sort and compareTo methods.

[Tolls]

First thing I see is:

String[] array = file.toFile().list();

That simply lists the files in a directory, or null if it's not a directory.

Not that it matters, as you never use the returned results anyway.

For your actual question, write a class that represents those values and build an ArrayList<BankAccount>.
That's the first step.

[NewbieGramer]

First thing I see is:

String[] array = file.toFile().list();

That simply lists the files in a directory, or null if it's not a directory.

Not that it matters, as you never use the returned results anyway.

For your actual question, write a class that represents those values and build an ArrayList<BankAccount>.
That's the first step.

public class Record
	{
	  String name;
	  double balance;
	  int idString;
	    
	    public Record(int idString, double balance, String name)
	    {
	    	this.idString = idString;
	    	this.balance = balance;
	    	this.name = name;
	    }
		public String getName() 
		{
			return name;
		}
		public void setName(String name)
		{
			this.name = name;
		}
		public double getBalance() 
		{
			return balance;
		}
		public void setBalance(double balance)
		{
			this.balance = balance;
		}
		public int getIdString() 
		{
			return idString;
		}
		public void setIdString(int idString) 
		{
			this.idString = idString;
		}
}

Is this what you meant?

[Tolls]

Something like that, though I'd name it what it is.