File APIs for Java Developers
Manipulate DOC, XLS, PPT, PDF and many others from your application.
The moose likes Java in General and the fly likes Showing the first record by press a button Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Java in General
Bookmark "Showing the first record by press a button" Watch "Showing the first record by press a button" New topic

Showing the first record by press a button

Jay Thomas

Joined: Mar 25, 2004
Posts: 3
For some reason I'm coding the .first() incorrectly because I get a compile error. This program is going to have a lot more navigating button but I decided to start will first record button first. Can someone help please, I really appreciate your time.
This is my code:
// Make it easy to access packaged code.
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.util.*;
* This class defines an applet to display store locations with four navigating
* buttons, First, Previous, Next, and Last.
* Written by: Jay Thomas
public class App extends Applet implements ActionListener, MouseListener {
// These object references have broad scope so they may be used throughout
// the class.
private SortedMap items; // The HashMap.
private Store current; // The current Item object being processed.
private TextField numberFld; // For entering/displaying the store number.
private TextField addressFld; // For displaying the store address.
private TextField phoneFld; // For entering/displaying the store phone number.
private Button bfirst; // The FIRST button.
private Button bnext; // The NEXT button.
private Button bprevious; // The PREVIOUS button.
private Button blast; // The LAST button.
private Label message; // The current message.
private String savedMessage; // For saving the previous message.
// This method defines initial (one-time) applet processing.
public void init() {
// Create the HashMap collection and load it with Item objects.

SortedMap items = new TreeMap();
current = new Store(56521, "4812 State Ave. Grand Rapids, MI", "616-567-1564");
current = new Store(56548, "1882 Luvs St. Big Rapids, MI", "231-452-4525");
current = new Store(56522, "1578 Main St. Pearl, MI", "564-254-4878");
// Set the size, background color, and layout manager for the applet window.
// NOTE: Because no layout manager is used, each component's size and
// location must be specifically set.
setSize(300, 300);
// Construct and set the main applet heading.
Label mainHdg = new Label("Store Phone Book");
mainHdg.setSize(250, 50);
mainHdg.setFont(new Font("SansSerif", Font.BOLD, 24));
mainHdg.setLocation(25, 25);
// Construct and set components for entering and displaying the store number.
Label numberHdg = new Label("Store #");
numberHdg.setSize(50, 25);
numberHdg.setLocation(20, 100);
numberFld = new TextField();
numberFld.setSize(25, 25);
numberFld.setLocation(20, 125);
// Construct and set components for displaying the store address.
Label addressHdg = new Label("Item address");
addressHdg.setSize(70, 25);
addressHdg.setLocation(70, 100);
addressFld = new TextField();
addressFld.setSize(130, 25);
addressFld.setLocation(70, 125);
// Construct and set components for entering and displaying the store phone number.
Label phoneHdg = new Label("Phone");
phoneHdg.setSize(50, 25);
phoneHdg.setLocation(205, 100);
phoneFld = new TextField();
phoneFld.setSize(75, 25);
phoneFld.setLocation(205, 125);
// Construct and set the FIRST button.
bfirst = new Button("First");
bfirst.setSize(60, 50);
bfirst.setLocation(30, 175);
// Construct and set the CHANGE button.
bnext = new Button("Next");
bnext.setSize(60, 50);
bnext.setLocation(120, 175);
// Construct and set the CANCEL button.
bprevious = new Button("Previous");
bprevious.setSize(60, 50);
bprevious.setLocation(210, 175);
// Construct and set the LAST button.
blast = new Button("Last");
blast.setSize(60, 50);
blast.setLocation(210, 175);
// Construct and set a label for displaying messages.
message = new Label("");
message.setSize(250, 25);
message.setLocation(25, 250);
// This method implements the abstract event handler method of the
// ActionListener interface to handle ActionEvents.
public void actionPerformed(ActionEvent e) {
// This block handles the processing of the FIRST button.
if (e.getSource().equals(bfirst)) {
current = (Store) items.get(current.first());
public void mouseEntered(MouseEvent e) {
savedMessage = message.getText();
if (e.getSource().equals(bnext))
message.setText("Proceed to the next record");
public void mouseExited(MouseEvent e) {
// Other required methods of the MouseListener interface. In this applet,
// they do nothing.
public void mouseClicked(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
// This class encapsulates the attributes and methods of an Item. It is by no
// means complete, but ONLY used to support the testing of the applet.
class Store {
// Instance variables.
private int number;
private String address;
private String phone;
// This constructor initializes the instance variables to values received
// from the class client without editing.
public Store(int iStoreNumber, String iAddress, String iPhone) {
number = iStoreNumber;
address = iAddress;
phone = iPhone;
// These methods are used to set the value of their associated instance
// variable.
public void setNumber(int nStoreNumber) {
number = nStoreNumber;
public void setAddress(String nAddress) {
address = nAddress;
public void setPhone(String nPhone) {
phone = nPhone;
// These methods are used to get the value of their associated instance
// variable.
public int getStoreNumber() {
return number;
public String getAddress() {
return address;
public String getPhone() {
return phone;
eammon bannon
Ranch Hand

Joined: Mar 16, 2004
Posts: 140
Your class Store has no first() method. So when you try to do this:

You are calling a non-existant method.
Jay Thomas

Joined: Mar 25, 2004
Posts: 3
How would I go abouts and making it possible for the Store Information to show by using .first()? I'm sorry it's just getting confusing.. Can you please give an example?
Stefan Wagner
Ranch Hand

Joined: Jun 02, 2003
Posts: 1923

You didn't read my reply to your previous post - did you?
Will you read this one, or start a new Thread?
I agree. Here's the link:
subject: Showing the first record by press a button
It's not a secret anymore!