Can't seem to add a clear button
Hi,
I'm new to java and I'm having problems creating a clear button. Basically I want to have a button once clicked that would clear some text fields and a JComboBox. Here's what I've got so far.
JButton clear = new JButton("<html><b>CLEAR");
clearFields.addActionListener();
content.add(clear);This should add the button and attach it to the action listener.
private void clearFields() {
ProjectOfficer.setText("");
}As you can see I'm only trying to clear one field at the moment. I've got 6 more textfields and one JComboBox to clear as well. Problem I'm getting is that on the clearFields.addActionListener(); line I get an error saying Cannot find symbol; variable clearFields.
I'm not sure why I'm getting this error because clearFields is clearly there?
Any help Please?
Thanks for both replies.
I'm very new to this which is why I've had so many problems. I've more or less been using the approach of learn as I go along. I know that isn't the best thing to do but at them moment its my only option. With your help cotton.m I've added the clear button but as you guessed it doesnt work. I've had a look through my code and with my basic knowledge I can't seem to figure out what the problem is. Here is my full code.
import java.awt.Container;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTextField;
import javax.swing.UIManager;
import java.sql.*;
import javax.swing.table.*;
import javax.swing.event.*;
* heckley.java
* Created on 25 August 2007, 10:42
* @author Tahir Malik
public class heckley {
//field variables - created here so all of our methods have access to them
protected JFrame window;
protected Container content;
//these ones are for the form objects
protected JTextField projectOfficer;
protected JTextField projectName;
protected JTextField projectDescription;
protected JTextField paymentSchedule;
protected JTextField banksInvestment;
protected JTextField paymentsMade;
protected JComboBox projectType;
* Creates a new instance of heckley
public heckley() {
//draw the GUI
drawGUI();
/** Adds a standard menubar to the window*/
private void menuBar() {
//create a new menubar
JMenuBar bar = new JMenuBar();
//attach the menubar to the window
window.setJMenuBar(bar);
//create the file menu
JMenu fileMenu = new JMenu("File");
fileMenu.setMnemonic('F');
bar.add(fileMenu);
JMenuItem quit = new JMenuItem("Quit");
quit.setMnemonic('Q');
//quit.setIcon(new ImageIcon("images/quit.png"));
quit.addActionListener(new QuitListener());
fileMenu.add(quit);
/** Draws the GUI **/
private void drawGUI() {
//set the user interface look and feel
try {
//if the user is using windows
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception ex) {
try {
//if the user is usisng Mac, Unix, OS/2, Solaris or Linux
UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
} catch(Exception xtc) {
System.err.println("Unable to determine a UI look and feel");
//create the main JFrame
window = new JFrame("Heckley");
//set close operation
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//add the menu bar
this.menuBar();
//create the container
content = window.getContentPane();
content.setLayout(new GridLayout(9,2,1,5));
Font f = new Font( "Courier", Font.ITALIC, 18 );
content.add(new JLabel(" Project Officer "));
projectOfficer = new JTextField();
content.add(projectOfficer);
content.add(new JLabel(" Project Name "));
projectName = new JTextField();
content.add(projectName);
content.add(new JLabel(" Project Description "));
projectDescription = new JTextField();
content.add(projectDescription);
content.add(new JLabel(" Payment Schedule "));
paymentSchedule = new JTextField();
content.add(paymentSchedule);
content.add(new JLabel(" Banks Investment "));
banksInvestment = new JTextField();
content.add(banksInvestment);
content.add(new JLabel(" Payments Made "));
paymentsMade = new JTextField();
content.add(paymentsMade);
content.add(new JLabel(" Project Type "));
projectType = new JComboBox();
String [] comboOptions = new String[] {"Leasing", "Profit Sharing", "Trade Financing" };
projectType.setModel(new DefaultComboBoxModel(comboOptions));
content.add(projectType);
JButton add = new JButton("<html><b>Add");
add.addActionListener(new AddToDatabaseListener());
content.add(add);
JButton remove = new JButton("<html><b>REMOVE");
remove.addActionListener(new RemoveFromDatabaseListener());
content.add(remove);
JButton clear = new JButton("CLEAR");
clear.addActionListener(this);// assuming your class implements ActionListener
content.add(clear);
JButton search = new JButton("<html><b>SEARCH");
search.addActionListener(new SearchFromDatabaseListener());
content.add(search);
//ALL MAIN GUI GENERATION HERE//
protected JTextField projectName;
protected JTextArea projectDescription;
protected JTextField paymentSchedule;
protected JTextField banksInvestment;
protected JTextField paymentsMade;
protected JComboBox projectType;*/
//pack the window
window.pack();
//display the window
window.setLocation(400,400);
window.setVisible(true);
//window.setResizable(false);
/** addToDatabase - Adds a set of data to the database
* @param project_officer The officers name
* @param project_name The projects name
* @param project_description The projects description
* @param payment_schedule The payment schedule
* @param already_paid The amount already paid
* @param banks_investment The amount the bank has invested
* @param project_type The type of project
* @returns zero for failiure, 1 for addition
public static int addToDatabase(String PROJECT_OFFICER, String PROJECT_NAME, String PROJECT_DESCRIPTION, String PAYMENT_SCHEDULE, int ALREADY_PAID, int BANKS_INVESTMENT, String PROJECT_TYPE) {
int added = 0;
Statement s = null;
try {
Class.forName("org.apache.derby.jdbc.ClientDriver").newInstance();
Connection connection = DriverManager.getConnection("jdbc:derby://localhost:1527/PROJECT;user=nbuser;password=nbuser");
s = connection.createStatement();
} catch (SQLException se) {
System.err.println("We got an exception while creating a statement:" +
"that probably means we're no longer connected.");
se.printStackTrace();
System.exit(1);
} catch (ClassNotFoundException cnfex) {
System.err.println("We got an exception while trying to import the Derby library. Check installation.");
cnfex.printStackTrace();
} catch (Exception ex) {
System.err.println("We got an exception while trying to use the Derby library. Check installation.");
ex.printStackTrace();
int m = 0;
try {
m = s.executeUpdate("INSERT INTO \"NBUSER\".\"TABLE\" VALUES" +
"('"+PROJECT_OFFICER+"', '"+PROJECT_NAME+"', '"+PROJECT_DESCRIPTION+"', '"+PAYMENT_SCHEDULE+"', "+ALREADY_PAID+", "+BANKS_INVESTMENT+", '"+PROJECT_TYPE+"')");
} catch (SQLException se) {
System.err.println("We got an exception while executing our query:" +
"that probably means our SQL is invalid");
se.printStackTrace();
return added;
/* Action listeners - we need 1 for every button or menu option we have */
class AddToDatabaseListener implements ActionListener {
public void actionPerformed(ActionEvent ent) {
//add to database event - call the function with correct parameters
System.out.println("This entry has been added to the database!");
//because all of the form objects are protected, we can directly get thier contents
String projectOfficerV = projectOfficer.getText();
String projectNameV = projectName.getText();
String projectDescriptionV = projectDescription.getText();
String paymentScheduleV = paymentSchedule.getText();
int banksInvestmentV = Integer.parseInt(banksInvestment.getText());
int paymentsMadeV = Integer.parseInt(paymentsMade.getText());
String projectTypeV = (String)projectType.getSelectedItem();
//call method to add
addToDatabase(projectOfficerV,projectNameV,projectDescriptionV,paymentScheduleV,banksInvestmentV,paymentsMadeV,projectTypeV);
class QuitListener implements ActionListener {
public void actionPerformed(ActionEvent ent) {
//action for file>quit
System.exit(0);
public static int removeFromDatabase(String PROJECT_NAME) {
int added = 0;
Statement s = null;
try {
Class.forName("org.apache.derby.jdbc.ClientDriver").newInstance();
Connection connection = DriverManager.getConnection("jdbc:derby://localhost:1527/PROJECT;user=nbuser;password=nbuser");
s = connection.createStatement();
} catch (SQLException se) {
System.err.println("We got an exception while creating a statement:" +
"that probably means we're no longer connected.");
se.printStackTrace();
System.exit(1);
} catch (ClassNotFoundException cnfex) {
System.err.println("We got an exception while trying to import the Derby library. Check installation.");
cnfex.printStackTrace();
} catch (Exception ex) {
System.err.println("We got an exception while trying to use the Derby library. Check installation.");
ex.printStackTrace();
int m = 0;
try {
m = s.executeUpdate("DELETE FROM \"NBUSER\".\"TABLE\" WHERE PROJECT_NAME = '" + PROJECT_NAME + "'");
} catch (SQLException se) {
System.err.println("We got an exception while executing our query:" +
"that probably means our SQL is invalid");
se.printStackTrace();
return added;
/* Action listeners - we need 1 for every button or menu option we have */
class RemoveFromDatabaseListener implements ActionListener {
public void actionPerformed(ActionEvent ent) {
//remove from database event - call the function with correct parameters
System.out.println("This entry has been removed to the database!");
//because all of the form objects are protected, we can directly get thier contents
String projectNameV = projectName.getText();
//call method to add
removeFromDatabase(projectNameV);
public static int searchFromDatabase(String PROJECT_NAME) {
int added = 0;
Statement s = null;
// Connection con = DriverManager.getConnection("jdbc:derby://localhost:1527/PROJECT;user=nbuser;password=nbuser");
try {
Class.forName("org.apache.derby.jdbc.ClientDriver").newInstance();
Connection connection = DriverManager.getConnection("jdbc:derby://localhost:1527/PROJECT;user=nbuser;password=nbuser");
s = connection.createStatement();
} catch (SQLException se) {
System.err.println("We got an exception while creating a statement:" +
"that probably means we're no longer connected.");
se.printStackTrace();
System.exit(1);
} catch (ClassNotFoundException cnfex) {
System.err.println("We got an exception while trying to import the Derby library. Check installation.");
cnfex.printStackTrace();
} catch (Exception ex) {
System.err.println("We got an exception while trying to use the Derby library. Check installation.");
ex.printStackTrace();
int m = 0;
try {
s.executeQuery("SELECT * FROM \"NBUSER\".\"TABLE\" WHERE PROJECT_NAME LIKE '" + PROJECT_NAME + "'");
// Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
// ResultSet.CONCUR_READ_ONLY);
// ResultSet srs = stmt.executeQuery("SELECT * FROM \"NBUSER\".\"TABLE\"");
} catch (SQLException se) {
System.err.println("We got an exception while executing our query:" +
"that probably means our SQL is invalid");
se.printStackTrace();
return added;
/* Action listeners - we need 1 for every button or menu option we have */
class SearchFromDatabaseListener implements ActionListener {
public void actionPerformed(ActionEvent ent) {
//remove from database event - call the function with correct parameters
System.out.println("SEARCHING THE DATABASE!");
//because all of the form objects are protected, we can directly get thier contents
String projectNameV = projectName.getText();
//call method to add
searchFromDatabase(projectNameV);
public void actionPerformed(ActionEvent evt){
if(evt.getActionCommand().equals("CLEAR")){
projectOfficer.setText("");
public static void main(String [] args) {
//create a new instance of the object
heckley h1 = new heckley();
}I'm getting this error on the following line.
AddActionListener (java.awt.event.ActionListener) in javax.swing.AbstractButton cannot be applied to (heckley)
clear.addActionListener(this);// assuming your class implements ActionListenerThanks for your help. I know I need to improve my java and I'm working towards that and have managed to fix most of my problems but for some reason I can't get this to work!
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