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Showing the first record by press a button  RSS feed

Jay Thomas
Posts: 3
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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
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Posts: 140
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Your class Store has no first() method. So when you try to do this:

You are calling a non-existant method.
Jay Thomas
Posts: 3
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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
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Posts: 1923
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You didn't read my reply to your previous post - did you?
Will you read this one, or start a new Thread?
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