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Thread: File Input

  1. #1
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    Default File Input

    Hello all

    I require a bit of help with my program I am attempting to build. The final purpose of it is to allow a user to, through a keypad on a GUI enter a string of 5 numbers (a zip code), which will be compared to a set of data and output relevant information that pertains to that area. Right now, I think I am having trouble getting the data into the arrays themselves I have set up. I am pretty sure the file is being read in because when I do a System.out.println() inside the while loop ( the loop I have set up to load data from the text files into the arrays) using inputFile.nextLine, or Array[any number] I get a value. But when I do System.out.println(Array[any number]) outside of the while loop, or use i outside or inside the loop I get nothing but null values. To anyone who can help, thankyou.

    Here is the gui
    import java.awt.* ;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import javax.swing.*;
     
    public class MichiganZip extends JFrame {
     
    	//Variables
    	JTextField zipField;
    	JButton zero, one, two, three, four, five, six, seven, eight, nine, submit, clear;
    	JPanel keyPad, visual;
    	String zip = "";
     
    	public MichiganZip() {
    		ZipManager zipmanager = new ZipManager();
     
    		keyPad = new JPanel();
    		keyPad.setLayout(new GridLayout(4, 3));
     
    		visual = new JPanel();
    		visual.setLayout(new FlowLayout());
     
    		zipField = new JTextField(6);
    		zipField.setEditable(false);
     
    		visual.add(zipField);
     
    		zero = new JButton("0");
    		one = new JButton("1");
    		two = new JButton("2");
    		three = new JButton("3");
    		four = new JButton("4");
    		five = new JButton("5");
    		six = new JButton("6");
    		seven = new JButton("7");
    		eight = new JButton("8");
    		nine = new JButton("9");
    		submit = new JButton("Submit");
    		clear = new JButton("clear");
     
    		zero.addActionListener(new ButtonListener());
    		one.addActionListener(new ButtonListener());
    		two.addActionListener(new ButtonListener());
    		three.addActionListener(new ButtonListener());
    		four.addActionListener(new ButtonListener());
    		five.addActionListener(new ButtonListener());
    		six.addActionListener(new ButtonListener());
    		seven.addActionListener(new ButtonListener());
    		eight.addActionListener(new ButtonListener());
    		nine.addActionListener(new ButtonListener());
    		submit.addActionListener(new ButtonListener());
    		clear.addActionListener(new ButtonListener());
     
    		keyPad.add(one);
    		keyPad.add(two);
    		keyPad.add(three);
    		keyPad.add(four);
    		keyPad.add(five);
    		keyPad.add(six);
    		keyPad.add(seven);
    		keyPad.add(eight);
    		keyPad.add(nine);
    		keyPad.add(submit);
    		keyPad.add(zero);
    		keyPad.add(clear);
     
    		Container Gui =  getContentPane();
    		Gui.setLayout(new GridLayout(1,1));
    		Gui.add(keyPad);
    		Gui.add(visual);
     
    		setTitle("Michigan Zips") ;
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) ;
            setSize(500, 300) ;
            setVisible(true) ;
    	}
     
    	private class ButtonListener implements ActionListener{
    		public void actionPerformed(ActionEvent e){
    			String actionCommand = e.getActionCommand();
     
    			if(actionCommand.equals("1"))
    			{
    				zip += "1";
    				zipField.setText(zip);
    			}
     
    			if(actionCommand.equals("2"))
    			{
    				zip += "2";
    				zipField.setText(zip);
    			}
     
    			if(actionCommand.equals("3"))
    			{
    				zip += "3";
    				zipField.setText(zip);				
    			}
     
    			if(actionCommand.equals("4"))
    			{
    				zip += "4";
    				zipField.setText(zip);
    			}
     
    			if(actionCommand.equals("5"))
    			{
    				zip += "5";
    				zipField.setText(zip);
    			}
     
    			if(actionCommand.equals("6"))
    			{
    				zip += "6";
    				zipField.setText(zip);
    			}
     
    			if(actionCommand.equals("7"))
    			{
    				zip += "7";
    				zipField.setText(zip);
    			}
     
    			if(actionCommand.equals("8"))
    			{
    				zip += "8";
    				zipField.setText(zip);
    			}
     
    			if(actionCommand.equals("9"))
    			{
    				zip += "9";
    				zipField.setText(zip);
    			}
     
    			if(actionCommand.equals("0"))
    			{
    				zip += "0";
    				zipField.setText(zip);
    			}
     
    			if(actionCommand.equals("clear"))
    			{
    				zip = " ";
    				zipField.setText(zip);
    			}
     
    		}
    	}
     
     
    	public static void main(String[] args){
    		MichiganZip search = new MichiganZip();
    	}
     
     
    }

    Here is the Zip code manager
    import java.io.*;
    import java.util.*;
    import javax.swing.JOptionPane;
     
    public class ZipManager {
     
     
    	//Variables
    	final static int NUM_ELM = 1300;
    	static String Zip[] = new String[NUM_ELM];
    	static double cordOne[] = new double[NUM_ELM];
    	static double cordTwo[] = new double[NUM_ELM];
    	static String State[] = new String[NUM_ELM];
    	static String City[] = new String[NUM_ELM];
    	int i = 0;
    	File file;
    	Scanner inputFile;
     
    	//attempt to open the file
    	{
    		try
    		{
    			file = new File("zipMI.txt");
    			inputFile = new Scanner(file);
    		}
    		catch (FileNotFoundException e)
    		{
    			JOptionPane.showMessageDialog(null, "File not found" + e);
    		}
    	}
     
    	{
    		while (inputFile.hasNext())
    		{
    			Zip[i] = inputFile.next();
    			cordOne[i] = inputFile.nextDouble();
    			cordTwo[i] = inputFile.nextDouble();
    			State[i] = inputFile.next();
    			City[i] = inputFile.next();
    			i++;						
    		}
    	}
     
    	public static void main(String[] args){
    		for(int i = 0; i < NUM_ELM; i++ ){
    		System.out.println(Zip[i]);}
    	}
     
    }

    And the text file with the zip codes is attached as a text file.
    Attached Files Attached Files


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: File Input

    Nothing prints out when I execute the code???

    I get a keypad in a GUI.

    Where do you see the problem?
    If you don't understand my answer, don't ignore it, ask a question.

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