Java – How do I use counter data for analytics?

Java – How do I use counter data for analytics? - java

I have a JFrame with three tabs: Home, Statistics, and About.
On the Home tab, I have a counter that tracks how many times you click your left or right arrow, and it updates a counter (I use the KeyListener method):
On the Statistics tab, I want to somehow import these Left and Right values that I generate from the counter.
But, I don't know how to. Can someone help me out here?
Edit:
Here is the code for the Home tab (Left/Right counter)
import java.awt.*;
import java.awt.Color;
import java.awt.Component;
import java.awt.FlowLayout;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.*;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class HomePanel extends JPanel implements KeyListener {
// Variables
private int counter = 0;
private int counter2 = 0;
private JLabel counterLabel;
private JLabel counterLabel2;
private JButton countUpButton;
private JButton countDownButton;
// Panel Elements
public HomePanel() {
countUpButton = new JButton ("Left");
countUpButton.setBounds(195, 121, 75, 29);
countUpButton.addKeyListener(this);
countDownButton = new JButton ("Right");
countDownButton.setBounds(195, 162, 77, 29);
countDownButton.addKeyListener(this);
counterLabel = new JLabel("" + counter);
counterLabel.setBounds(282, 126, 34, 16);
counterLabel2 = new JLabel("" + counter2);
counterLabel2.setBounds(282, 167, 34, 16);
setLayout(null);
add (countUpButton);
add (counterLabel);
add (countDownButton);
add (counterLabel2);
}
// Key Listener
public void keyTyped(KeyEvent e) {
// TODO Auto-generated method stub
}
// Ensures counter updates once per stroke
#Override
public void keyPressed(KeyEvent e) {
// TODO Auto-generated method stub
if (e.getKeyCode() == KeyEvent.VK_LEFT) {
counter++;
counterLabel.setText("" + counter);
} else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
counter2++;
counterLabel2.setText("" + counter2);
}
}
#Override
public void keyReleased(KeyEvent e) {
// TODO Auto-generated method stub
}
}
And here is the code for the Statistics tab:
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class StatsPanel extends JPanel {
private JTextField textField;
private JTextField textField_1;
private JTextField textField_2;
private JTextField textField_3;
private JTextField textField_4;
private JTextField textField_5;
private JTextField textField_6;
public StatsPanel() {
setLayout(null);
JPanel panel = new JPanel();
panel.setBounds(41, 43, 371, 234);
add(panel);
panel.setLayout(null);
JLabel lblNewLabel = new JLabel("LEFT:");
lblNewLabel.setBounds(115, 39, 33, 16);
panel.add(lblNewLabel);
JLabel lblRight = new JLabel("RIGHT:");
lblRight.setBounds(105, 67, 43, 16);
panel.add(lblRight);
JLabel lblNewLabel_2 = new JLabel("TOTAL:");
lblNewLabel_2.setBounds(102, 95, 46, 16);
panel.add(lblNewLabel_2);
JLabel lblNewLabel_3 = new JLabel("% LEFT:");
lblNewLabel_3.setBounds(102, 123, 46, 16);
panel.add(lblNewLabel_3);
JLabel lblNewLabel_4 = new JLabel("% RIGHT: ");
lblNewLabel_4.setBounds(91, 151, 60, 16);
panel.add(lblNewLabel_4);
textField_2 = new JTextField();
textField_2.setBounds(160, 33, 134, 28);
panel.add(textField_2);
textField_2.setColumns(10);
textField_3 = new JTextField();
textField_3.setBounds(160, 61, 134, 28);
panel.add(textField_3);
textField_3.setColumns(10);
textField_4 = new JTextField();
textField_4.setBounds(160, 89, 134, 28);
panel.add(textField_4);
textField_4.setColumns(10);
textField_5 = new JTextField();
textField_5.setBounds(160, 117, 134, 28);
panel.add(textField_5);
textField_5.setColumns(10);
textField_6 = new JTextField();
textField_6.setBounds(160, 145, 134, 28);
panel.add(textField_6);
textField_6.setColumns(10);
JButton btnCalculate = new JButton("Calculate");
btnCalculate.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
// Variables
double num1, num2, ans, percEq1, percEq2, percLeft, percRight;
try {
num1 = Double.parseDouble(textField_2.getText());
num2 = Double.parseDouble(textField_3.getText());
ans = num1 + num2;
textField_4.setText(Double.toString(ans));
percEq1 = (num1/(num1+num2))*100;
percLeft = Math.round(percEq1);
textField_5.setText(Double.toString(percLeft));
percEq2 = (num2/(num1+num2))*100;
percRight = Math.round(percEq2);
textField_6.setText(Double.toString(percRight));
} catch (Exception e) {
JOptionPane.showMessageDialog(null, "Please enter a valid number!");
}
}
});
btnCalculate.setBounds(79, 185, 117, 29);
panel.add(btnCalculate);
JButton btnRest = new JButton("Reset");
btnRest.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
textField_2.setText("");
textField_3.setText("");
textField_4.setText("");
textField_5.setText("");
textField_6.setText("");
}
});
btnRest.setBounds(197, 185, 117, 29);
panel.add(btnRest);
}
}

I suggest using variables in the parent container so every tab can access them or, from the statistics tab, ask the values to the parent frame and the parent asks to the home tab.
It's not a short code and you haven't attached yours, so I hope your get the idea.
In the main container you have something like this:
KeyPressStats statistics = new KeyPressStats();
HomePanel home = new HomePanel(statistics);
StatsPanel stats = new StatsPanel(statistics);
JTabbedPane tabbed = new JTabbedPane();
tabbed.addTab("Home", home);
tabbed.addTab("Stats", stats);
tabbed.setVisible(true);
KeyPressStats is as follows:
public class KeyPressStats {
private int leftCount = 0;
private int rightCount = 0;
public int getLeftCount() {
return leftCount;
}
public void setLeftCount(int leftCount) {
this.leftCount = leftCount;
}
public int getRightCount() {
return rightCount;
}
public void setRightCount(int rightCount) {
this.rightCount = rightCount;
}
public void incrementRight() {
rightCount++;
}
public void incrementLeft() {
leftCount++;
}
}
And the code in the Home and stats tabs will have these changes:
public class HomePanel extends JPanel implements KeyListener {
...
private KeyPressStats stats;
public HomePanel(KeyPressStats stats) {
this.stats = stats;
countUpButton = new JButton("Left");
countUpButton.setBounds(195, 121, 75, 29);
...
}
#Override
public void keyPressed(KeyEvent e) {
if (e.getKeyCode() == KeyEvent.VK_LEFT) {
stats.incrementLeft();
counterLabel.setText("" + stats.getLeftCount());
} else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
stats.incrementRight();
counterLabel2.setText("" + stats.getRightCount());
}
}
public class StatsPanel extends JPanel {
...
public StatsPanel(KeyPressStats stats) {
...
textField_2 = new JTextField(""+stats.getLeftCount());
textField_2.setBounds(160, 33, 134, 28);
...
textField_3 = new JTextField(""+stats.getRightCount());
textField_3.setBounds(160, 61, 134, 28);
...
}
}

Related

Graphical User Interface and Main Method needs sorting

Im trying to sort my GUI so it will be able to use the methods from the other classes
in the JProject i also want to call it from the main.
The action listeners i had just learnt today so i need feedback on what to do there as well.
Any Ideas??
It would be a great help to get some insight on this!
(I am new to stack so my code posted in the explanation and in the actual script idk
why).
package test;
import javax.swing.JPanel;
import javax.swing.JLabel;
import com.jgoodies.forms.factories.DefaultComponentFactory;
import java.awt.Container;
import java.awt.SystemColor;
import java.awt.Color;
import javax.swing.JRadioButton;
import java.awt.Font;
import java.io.File;
import javax.swing.JTextField;
import javax.swing.JTextPane;
import javax.swing.JComboBox;
import javax.swing.JButton;
import java.util.ArrayList;
import java.util.Scanner;
//Main Method
public class TextUI{
protected StormTracker var;
public TextUI(StormTracker var)
{
this.var=var;
}
public static void main(String[] args)
{
ShowGUI gui = new SHOWGUI();
while(gui.running)
if(gui.buttonPress == -1)
continue;
StormTracker obj = new StormTracker("config.txt");
WeatherAuthority wa = new WeatherAuthority("stormfile.txt");
int xcoord=0;
int ycoord=0;
TextUI uiobj = new TextUI(obj);
Scanner scan = new Scanner(System.in);
while(true){
System.out.println("---------------------------------------------------------------");
System.out.println("Welcome to the StormTracker Application.");
System.out.println("Type the following commands to carry out the associated actions.");
System.out.println("\n");
System.out.println("----------------------{Commands Menu}---------------------
-------");
System.out.println("(1) NEW STORM x y");
System.out.println("(2) UPGRADE <name of storm>");
System.out.println("(3) DOWNGRADE <name of storm>");
System.out.println("(4) TICK");
System.out.println("(5) EXIT");
System.out.println("----------------------------------------------------------------");
String option=scan.nextLine();
if (option.substring(0,4).equals("TICK")){
obj.tick();
continue;
}
if (option.substring(0,9).equals("NEW STORM")){
if(option.length()==13){
xcoord = Integer.parseInt(option.substring(10,11));
ycoord = Integer.parseInt(option.substring(12,13));
}
else if (option.length()==14){
if (option.substring(11,12).equals(" ")){
xcoord = Integer.parseInt(option.substring(10,11));
ycoord = Integer.parseInt(option.substring(12,14));
}
else{
xcoord = Integer.parseInt(option.substring(10,12));
ycoord = Integer.parseInt(option.substring(13,14));
}
}
else if (option.length()==15){
xcoord = Integer.parseInt(option.substring(10,12));
ycoord = Integer.parseInt(option.substring(13,15));
}
obj.newstorm(xcoord,ycoord);
}
if (option.substring(0,7).equals("UPGRADE")){
String storm_name = option.substring(8);
obj.upgrade(storm_name);
}
if (option.substring(0,9).equals("DOWNGRADE")){
String storm_name = option.substring(10);
obj.downgrade(storm_name);
}
}
}
//GUI Class
public ShowGUI extends JPanel {
private JTextField textField;
private JTextField textField_1;
private JTextField textField_2;
private JTextField textField_3;
private JTextField textField_4;
System.out.println("GUI Successfully Loaded");
createAndShow();
setToolTipText("Select Storm");
setBackground(Color.WHITE);
}
private void createAndShow(){
JPanel mainFrame = new JPanel("Storm Tracker V1.0");
}
private void addComponents(Container pane){
pane.setLayout(null);
JLabel lblStormTrackerV = DefaultComponentFactory.getInstance().createTitle("
Storm Tracker V1.0");
lblStormTrackerV.setBackground(SystemColor.activeCaption);
lblStormTrackerV.setFont(new Font("Calibri", Font.PLAIN, 22));
lblStormTrackerV.setBounds(162, 11, 430, 41);
add(lblStormTrackerV);
JRadioButton rdbtnMap = new JRadioButton("MAP");
rdbtnMap.setBounds(283, 59, 72, 23);
add(rdbtnMap);
JRadioButton rdbtnBulletin = new JRadioButton("Bulletin");
rdbtnBulletin.setBounds(406, 60, 72, 23);
add(rdbtnBulletin);
textField = new JTextField();
textField.setBounds(61, 103, 72, 20);
add(textField);
textField.setColumns(10);
textField_1 = new JTextField();
textField_1.setBounds(61, 134, 72, 20);
add(textField_1);
textField_1.setColumns(10);
JTextPane txtpnX = new JTextPane();
txtpnX.setText("X:");
txtpnX.setBounds(23, 103, 28, 20);
add(txtpnX);
JTextPane txtpnY = new JTextPane();
txtpnY.setText("Y:");
txtpnY.setBounds(23, 134, 12, 20);
add(txtpnY);
JTextPane txtpnSpeed = new JTextPane();
txtpnSpeed.setText("Speed:");
txtpnSpeed.setBounds(10, 165, 41, 20);
add(txtpnSpeed);
textField_2 = new JTextField();
textField_2.setBounds(61, 165, 72, 20);
add(textField_2);
textField_2.setColumns(10);
textField_3 = new JTextField();
textField_3.setBounds(61, 196, 72, 20);
add(textField_3);
textField_3.setColumns(10);
JTextPane txtpnSpeed_1 = new JTextPane();
txtpnSpeed_1.setText("Speed:");
txtpnSpeed_1.setBounds(10, 196, 41, 20);
add(txtpnSpeed_1);
JTextPane txtpnBearing = new JTextPane();
txtpnBearing.setText("Bearing:");
txtpnBearing.setBounds(10, 227, 41, 20);
add(txtpnBearing);
textField_4 = new JTextField();
textField_4.setBounds(61, 227, 72, 20);
add(textField_4);
textField_4.setColumns(10);
File input = new File(new
FileReader("C:\\Users\\620086793\\Documents\\test\\src\\test"));
List<String> strings = new ArrayList<String>();
try {
String line = null;
while (( line = input.readLine()) != null){
strings.add(line);
}
}
catch (FileNotFoundException e) {
System.err.println("Error, file " + "C:\\Users\\620086793\\Documents\\test\\src\\test" + " didn't exist.");
}
finally {
input.close();
}
String[] lineArray = strings.toArray(new String[]{});
JComboBox comboBox = new JComboBox(lineArray);
JComboBox comboBox = new JComboBox();
comboBox.setToolTipText("Select Storm");
comboBox.setEditable(true);
comboBox.setBounds(20, 60, 113, 20);
add(comboBox);
JButton btnUpdate = new JButton("UPDATE");
btnUpdate.setFont(new Font("Calibri", Font.BOLD, 11));
btnUpdate.setBounds(10, 273, 110, 28);
add(btnUpdate);
JButton btnNewButton = new JButton("NEW STORM\r\n");
btnNewButton.setFont(new Font("Calibri", Font.BOLD, 11));
btnNewButton.setBounds(10, 312, 110, 28);
add(btnNewButton);
addActionListeners();
pane.add(rdbtnMap);
pane.add(rdbtnBulletin);
pane.add(textField);
pane.add(textField_1);
pane.add(textField_2);
pane.add(textField_3);
pane.add(textField_4);
pane.add(comboBox);
pane.add(btnUpdate);
pane.add(btnNewButton);
}
//Im not sure how to properly add the action listeners i first learned about them
today.
private void addActionListeners(){
rdbtnMap.addActionListener(new ActionListener){
public void actionPerformed(ActionEvent ){
}
}
rdbtnBulletin.addActionListener(){
public void actionPerformed(ActionEvent ){
}
}
textField.addActionListener(){
public void actionPerformed(ActionEvent ){
}
}
textField_2.addActionListener(){
public void actionPerformed(ActionEvent ){
}
}
textField_3.addActionListener(){
public void actionPerformed(ActionEvent ){
}
}
textField_4.addActionListener(){
public void actionPerformed(ActionEvent ){
stormTracker.tick = textField_4;
}
}
comboBox.addActionListener(){
public void actionPerformed(ActionEvent ){
}
}
btnUpdate.addActionListener(){
public void actionPerformed(ActionEvent ){
obj.upgrade() = btnUpdate;
return btnUpdate;
}
}
btnNewButton.addActionListener(){
public void actionPerformed(ActionEvent ){
}
}
}

Toggle Java JPanels - each panel deifferent class

I'm a beginer in Java GUI, and i have an issue with trying to toggle between panel in other class.
My main Class "MyBoxGUI" has 2 Panels, "Login" and "UserMenu"
The default is "Login" panel, when pressing "OK" the window moved to "UserMenu" Panel.
So far so good while in the same class.
The issue is, when i set a new panel in new class and setvisibe that panel, i can't go back to "UserMenu" panel - (The actionlistener is working fine).
Can someone help me please?
MyBoxGUI Class
package main;
import java.awt.EventQueue;
import javax.swing.JFrame;
import java.awt.CardLayout;
import java.awt.Component;
//import javax.swing.JDialog;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import java.awt.Font;
import java.awt.Color;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import java.awt.Toolkit;
import GUIs.*;
//import ocsf.client.*;
public class MyBoxGUI extends JPanel
{
private Mtds mtd;
public JFrame frmMybox;
private static JTextField UserName;
private static JTextField port;
private static JTextField IP;
private static JPasswordField passwordField;
public final JPanel Login = new JPanel();
public final JPanel UserMenu = new JPanel();
/**
* Launch the application.
*/
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
try
{
MyBoxGUI window = new MyBoxGUI();
window.frmMybox.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public MyBoxGUI()
{
mtd = new Mtds();
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize()
{
frmMybox = new JFrame();
frmMybox.setFont(new Font("Tempus Sans ITC", Font.BOLD, 15));
// frmMybox.setIconImage(Toolkit.getDefaultToolkit().getImage(MyBoxGUI.class.getResource("/images/gift-ideas-gift-card-bridal-gift-baby-shower-gift-gift-box-groom-gift-christmas-gift-party-gift-gift-for-wedding-friend-gift-birthday-gift-baby-gift-good-gift-box-ideas-for-friend-necklace-gift-box.jpg")));
frmMybox.setBounds(100, 100, 800, 500);
frmMybox.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frmMybox.getContentPane().setLayout(new CardLayout(0, 0));
frmMybox.setTitle("MyBox");
frmMybox.getContentPane().add(Login);
Login.setLayout(null);
JButton btnNewButton = new JButton("OK");
btnNewButton.addActionListener(new ActionListener()
{
#SuppressWarnings("deprecation")
public void actionPerformed(ActionEvent arg0)
{
Boolean ok = false;
String UName, Pass, Prt, SIP;
UName = UserName.getText();
Pass = passwordField.getText();
Prt = port.getText();
SIP = IP.getText();
if( ( mtd.isUserValid(UName) && mtd.isPasswordValid(Pass) && mtd.isPortValid(Prt) && mtd.isIPValid(SIP))
&& ( !UName.equals("") && !Pass.equals("") && !Prt.equals("") && !SIP.equals("") ) )
ok = true;
else
{
if(!mtd.isUserValid(UName) || UName.equals(""))
JOptionPane.showMessageDialog(frmMybox,"User Name Can Contain Only The Following Characters: ( 0-9 , a-z , A-Z , _ )"
+ " ","Invalid characters",JOptionPane.WARNING_MESSAGE);
else if(!mtd.isPasswordValid(Pass) || Pass.equals(""))
JOptionPane.showMessageDialog(frmMybox,"Invalid characters","Error Message",JOptionPane.WARNING_MESSAGE);
else if(!mtd.isPortValid(Prt) || Prt.equals(""))
JOptionPane.showMessageDialog(frmMybox,"Port Can Contain Only Numbers","Invalid characters",JOptionPane.WARNING_MESSAGE);
else if(!mtd.isIPValid(SIP) || SIP.equals(""))
JOptionPane.showMessageDialog(frmMybox,"IP Address Can Contain Only Numbers seperated By Dots '.' ","Invalid characters",JOptionPane.WARNING_MESSAGE);
}
if(ok)
{
//LoginController user = new LoginController();
//chat= new ClientGUI(IP.getText(),port.getText());
//client = ClientGUI.getClient();
//msg=new Msg("login",user);
//client.handleMessageFromClientUI(msg);
setScreen(Login,UserMenu);
// frmMybox.getContentPane().add(UserMenu, "UserMenu");
// UserMenu.setVisible(true);
// Login.setVisible(false);
}
}
});
btnNewButton.setBounds(344, 313, 82, 48);
Login.add(btnNewButton);
JLabel lblWellcomeToMybox = new JLabel("Wellcome to MyBox");
lblWellcomeToMybox.setForeground(new Color(51, 204, 255));
lblWellcomeToMybox.setFont(new Font("Arial", Font.PLAIN, 36));
lblWellcomeToMybox.setBounds(224, 23, 327, 42);
Login.add(lblWellcomeToMybox);
JLabel lblUserName = new JLabel("User Name:");
lblUserName.setBounds(268, 109, 89, 14);
lblUserName.setFont(new Font("Arial", Font.PLAIN, 14));
Login.add(lblUserName);
JLabel lblPassword = new JLabel("Password:");
lblPassword.setBounds(268, 139, 69, 14);
lblPassword.setFont(new Font("Arial", Font.PLAIN, 14));
Login.add(lblPassword);
JLabel lblServerPort = new JLabel("Server port:");
lblServerPort.setBounds(268, 197, 82, 14);
lblServerPort.setFont(new Font("Arial", Font.PLAIN, 14));
Login.add(lblServerPort);
JLabel lblServerIp = new JLabel("Server IP:");
lblServerIp.setBounds(266, 222, 71, 14);
lblServerIp.setFont(new Font("Arial", Font.PLAIN, 14));
Login.add(lblServerIp);
UserName = new JTextField();
UserName.setBounds(406, 107, 96, 20);
Login.add(UserName);
UserName.setColumns(10);
port = new JTextField();
port.setBounds(406, 195, 96, 20);
Login.add(port);
port.setColumns(10);
IP = new JTextField();
IP.setBounds(406, 220, 96, 20);
Login.add(IP);
IP.setColumns(10);
passwordField = new JPasswordField();
passwordField.setBounds(406, 137, 96, 20);
Login.add(passwordField);
frmMybox.getContentPane().add(UserMenu, "User Menu");
UserMenu.setLayout(null);
JButton LeaveGOI = new JButton("Back");
LeaveGOI.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0)
{
setScreen(UserMenu,Login);
}
});
LeaveGOI.setBounds(10, 66, 153, 23);
UserMenu.add(LeaveGOI);
JButton btnJoinAGoi = new JButton("Join a GOI");
btnJoinAGoi.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
}
});
btnJoinAGoi.setBounds(10, 100, 153, 23);
UserMenu.add(btnJoinAGoi);
JButton btnSearchForA = new JButton("Search for a GOI");
btnSearchForA.setBounds(10, 134, 153, 23);
UserMenu.add(btnSearchForA);
JButton btnCreateAGoi = new JButton("Create a GOI");
btnCreateAGoi.setBounds(10, 32, 153, 23);
UserMenu.add(btnCreateAGoi);
JButton btnFilesSharedWith = new JButton("Files shared with you");
btnFilesSharedWith.setBounds(271, 66, 153, 23);
UserMenu.add(btnFilesSharedWith);
JButton btnUploadAFile = new JButton("Upload a file");
btnUploadAFile.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
JPanel UpLoad = new UploadFile();
setScreen(UserMenu,UpLoad);
// frmMybox.getContentPane().add(UpLoad, "UpLoad");
// UserMenu.setVisible(false);
// UpLoad.setVisible(true);
}
});
btnUploadAFile.setBounds(271, 32, 153, 23);
UserMenu.add(btnUploadAFile);
JButton btnSignout = new JButton("Sign-Out");
btnSignout.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
int dialog=JOptionPane.showConfirmDialog(Login, getUserName()+", are you sure you wants to leave?", "Do you want to leave?", JOptionPane.YES_NO_OPTION);
if(dialog==0){
//client.quit();
}
}
});
btnSignout.setBounds(293, 227, 131, 23);
UserMenu.add(btnSignout);
JButton btnHelpme = new JButton("Help-Me");
btnHelpme.addActionListener(new ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
JOptionPane.showMessageDialog(Login,"Hello "+ getUserName()+", wellcom to Mybox!\n"
+ "Inside GOIs buttons you can ask to join, leave and even create a GOI.\n"
+ "Inside Files buttons you can check and edit files people shared with you.\n"
+ "You can even become an uploader and share files you own.\n"
+ "We wish you good luck and have fun using MyBox!");
}
});
btnHelpme.setBounds(10, 227, 131, 23);
UserMenu.add(btnHelpme);
}
public static String getUserName(){
return UserName.getText();
}
#SuppressWarnings("deprecation")
public static String getPassword(){
return passwordField.getText();
}
public static String getIP(){
return IP.getText();
}
public static String getPort(){
return port.getText();
}
public void setScreen(JPanel fls, JPanel tru)
{
frmMybox.getContentPane().add(tru);
tru.setVisible(true);
fls.setVisible(false);
}
}
UploadFile Class
package GUIs;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JTextField;
import main.MyBoxGUI;
public class UploadFile extends MyBoxGUI {
private JTextField textField;
/**
* Create the panel.
*/
public static final JPanel UpLoad = new JPanel();
public UploadFile()
{
setBounds(100, 100, 800, 500);
setLayout(null);
JButton btnNewButton = new JButton("Back");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0)
{
setScreen(UpLoad,UserMenu);
System.out.print("A+++");
}
});
btnNewButton.setBounds(126, 145, 205, 30);
add(btnNewButton);
textField = new JTextField();
textField.setBounds(409, 150, 300, 20);
add(textField);
textField.setColumns(10);
JButton btnDone = new JButton("Done");
btnDone.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
btnDone.setBounds(365, 223, 89, 30);
add(btnDone);
JButton btnHelpMe = new JButton("Help Me");
btnHelpMe.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
btnHelpMe.setBounds(188, 390, 122, 52);
add(btnHelpMe);
JButton SignOut = new JButton("Sign-Out");
SignOut.setBounds(501, 392, 122, 48);
add(SignOut);
}
}

public void setScreen(JPanel fls, JPanel tru)
{
frmMybox.getContentPane().add(tru);
tru.setVisible(true);
fls.setVisible(false);
frmMybox.getContentPane().revalidate();
frmMybox.getContentPane().repaint();
}
update your setScreen method as above.

Frame active, but setting visible to false = nullpointer

So i have a bit of a weird issue, i just posted and fixed my other error, but that seems to have created this one, and it makes no sense.
Basically, the user presses a button, this window opens, then whether he presses cancel, or register, this window should setVisible to false. but when this code gets executed, it says my window is null.
package frontend;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.SQLException;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;
public class Registration extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
private static boolean ranOnce = false;
private JPanel contentPane;
private Registration reg;
private JTextField userTF;
private JTextField passTF;
private JTextField emailTF;
private LoginProcess lp = new LoginProcess();
private JLabel error;
private JButton cancelBtn;
/**
* Create the frame.
*/
public Registration() {
if (!ranOnce) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
reg = new Registration();
reg.setVisible(true);
ranOnce = true;
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 245, 212);
setLocationRelativeTo(null);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblUsername = new JLabel("Username:");
lblUsername.setBounds(10, 11, 75, 14);
contentPane.add(lblUsername);
JLabel lblPassword = new JLabel("Password:");
lblPassword.setBounds(10, 36, 75, 14);
contentPane.add(lblPassword);
JLabel lblEmail = new JLabel("Email:");
lblEmail.setBounds(10, 61, 75, 14);
contentPane.add(lblEmail);
userTF = new JTextField();
userTF.setBounds(95, 8, 130, 20);
contentPane.add(userTF);
userTF.setColumns(10);
passTF = new JTextField();
passTF.setColumns(10);
passTF.setBounds(95, 33, 130, 20);
contentPane.add(passTF);
emailTF = new JTextField();
emailTF.setColumns(10);
emailTF.setBounds(95, 58, 130, 20);
contentPane.add(emailTF);
error = new JLabel("");
error.setBounds(10, 154, 215, 14);
contentPane.add(error);
JButton regBtn = new JButton("Register");
regBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if (!userTF.getText().equals("") || !passTF.getText().equals("") || !emailTF.getText().equals("")) {
try {
if (lp.newUser(userTF.getText(), passTF.getText(), emailTF.getText())) {
// THIS IS LINE 117 reg.setVisible(false);
Main.mainFrame.setVisible(true);
} else {
if (lp.duplicateAccount) {
error.setText("Error: Username already in use.");
}
}
} catch (SQLException e) {
}
}
}
});
regBtn.setBounds(10, 120, 215, 23);
contentPane.add(regBtn);
cancelBtn = new JButton("Cancel");
cancelBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
reg.setVisible(false);
Main.mainFrame.setVisible(true);
}
});
cancelBtn.setBounds(10, 86, 215, 23);
contentPane.add(cancelBtn);
}
}
this is the abnormal error:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at frontend.Registration$3.actionPerformed(Registration.java:117)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
i really have no clue as to why it's saying my window is null, when it's not. it has to be something i've done when initialising the window.

Why is it not working ?
You are not using Singleton design pattern correctly. Did you notice that you have two JFrame popping up ?
if (!ranOnce)
{
EventQueue.invokeLater(new Runnable()//this call the run method in a separate thread
{
public void run()
{
try
{
// for the current instance of Registration, you are setting
// the reg variable by calling another instance of Registration => thats not the correct way to do a Singleton
reg = new Registration();
reg.setVisible(true);
ranOnce = true;
}
catch (Exception e)
{
e.printStackTrace();
}
}
});
}
So, let's assume you are calling new Registration() in your main method, you will enter the public Registration() constructor (let's call it instance1) and set the variable reg by calling one more time the constructor new Registration() (instance2) but by this time, ranOnce will be true and so EventQueue.invokeLater will not be called => reg will not be set in instance2 => NullPointerException when clicking on Jbutton in the second frame (the one on the top) (instance2). Clicking on first frame (instance1) button's will hide the second frame (instance2).
How to fix it ?
Use a proper Singleton :
private static final long serialVersionUID = 1L;
private static boolean ranOnce = false;
private JPanel contentPane;
private static Registration reg;
private JTextField userTF;
private JTextField passTF;
private JTextField emailTF;
private LoginProcess lp = new LoginProcess();
private JLabel error;
private JButton cancelBtn;
public static synchronized Registration getRegistration()
{
if(reg == null)
reg = new Registration();
return reg;
}
/**
* Create the frame.
*/
private Registration()
{
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 245, 212);
setLocationRelativeTo(null);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel lblUsername = new JLabel("Username:");
lblUsername.setBounds(10, 11, 75, 14);
contentPane.add(lblUsername);
JLabel lblPassword = new JLabel("Password:");
lblPassword.setBounds(10, 36, 75, 14);
contentPane.add(lblPassword);
JLabel lblEmail = new JLabel("Email:");
lblEmail.setBounds(10, 61, 75, 14);
contentPane.add(lblEmail);
userTF = new JTextField();
userTF.setBounds(95, 8, 130, 20);
contentPane.add(userTF);
userTF.setColumns(10);
passTF = new JTextField();
passTF.setColumns(10);
passTF.setBounds(95, 33, 130, 20);
contentPane.add(passTF);
emailTF = new JTextField();
emailTF.setColumns(10);
emailTF.setBounds(95, 58, 130, 20);
contentPane.add(emailTF);
error = new JLabel("");
error.setBounds(10, 154, 215, 14);
contentPane.add(error);
JButton regBtn = new JButton("Register");
regBtn.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
if (!userTF.getText().equals("") || !passTF.getText().equals("") || !emailTF.getText().equals("")) {
try {
if (lp.newUser(userTF.getText(), passTF.getText(), emailTF.getText())) {
setVisible(false);
Main.mainFrame.setVisible(true);
} else {
if (lp.duplicateAccount) {
error.setText("Error: Username already in use.");
}
}
} catch (SQLException e) {
}
}
}
});
regBtn.setBounds(10, 120, 215, 23);
contentPane.add(regBtn);
cancelBtn = new JButton("Cancel");
cancelBtn.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0)
{
setVisible(false);
}
});
cancelBtn.setBounds(10, 86, 215, 23);
contentPane.add(cancelBtn);
}
public static void main(String[] args)
{
Registration registration = Registration.getRegistration();
registration.setVisible(true);
}

Try setVisible(fasle) instead of reg.setVisible(false)

when i am writing ActionListener this one should be error public class ex12 extends JFrame implements ActionListene

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.event.ActionEvent;
public class ex12 extends JFrame implements ActionListener {
JPanel contentPane;
JTextField textField;
JTextField textField_1;
JTextField textField_2;
JTextField textField_3;
JTextField textField_4;
JTextField textField_5;
public ex12() {
setTitle("Student marks");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 472, 411);
contentPane = new JPanel();
contentPane.setBorder(null);
contentPane.setLayout(null);
setContentPane(contentPane);
JLabel lblNewLabel = new JLabel("Name");
lblNewLabel.setBounds(62, 61, 46, 14);
contentPane.add(lblNewLabel);
textField = new JTextField();
textField.setBounds(153, 58, 86, 20);
contentPane.add(textField);
textField.setColumns(10);
JLabel lblNewLabel_1 = new JLabel("m1");
lblNewLabel_1.setBounds(62, 108, 46, 14);
contentPane.add(lblNewLabel_1);
textField_1 = new JTextField();
textField_1.setBounds(153, 105, 86, 20);
contentPane.add(textField_1);
textField_1.setColumns(10);
JLabel lblNewLabel_2 = new JLabel("m2");
lblNewLabel_2.setBounds(62, 157, 46, 14);
contentPane.add(lblNewLabel_2);
textField_2 = new JTextField();
textField_2.setBounds(153, 154, 86, 20);
contentPane.add(textField_2);
textField_2.setColumns(10);
JLabel lblNewLabel_3 = new JLabel("tot");
lblNewLabel_3.setBounds(62, 213, 46, 14);
contentPane.add(lblNewLabel_3);
textField_3 = new JTextField();
textField_3.setBounds(153, 210, 86, 20);
contentPane.add(textField_3);
textField_3.setColumns(10);
JLabel lblNewLabel_4 = new JLabel("Avg");
lblNewLabel_4.setBounds(62, 270, 46, 14);
contentPane.add(lblNewLabel_4);
textField_4 = new JTextField();
textField_4.setBounds(153, 267, 86, 20);
contentPane.add(textField_4);
textField_4.setColumns(10);
JLabel lblNewLabel_5 = new JLabel("Grade");
lblNewLabel_5.setBounds(62, 317, 46, 14);
contentPane.add(lblNewLabel_5);
textField_5 = new JTextField();
textField_5.setBounds(153, 314, 86, 20);
contentPane.add(textField_5);
textField_5.setColumns(10);
JButton ok = new JButton("Ok");
ok.setBounds(313, 73, 89, 23);
contentPane.add(ok);
ok.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent arg0) {
double bsal,tax,allo,nsal;
if (arg0. getSource().equals(ok))
{
if(bsal > 5000 )
{
tax = bsal * 0.15;
allo = bsal * 0.2;
}
else if (bsal > 30000)
{
tax = bsal * 0.5;
allo = bsal * 0.1;
}
else if (bsal > 20000)
{
tax = 0;
allo = 0;
}
else
{
tax = 0;
allo = 0;
}
}
}
});
}
public static void main(String[] args) {
ex12 e = new ex12();
e.show();
}
}
above program i tried to write ActionListener it is giving error.
this is code
public class ex12 extends JFrame implements ActionListener
i wrote this program on eclipse
please any one fix this error

You need to implement the required methods that come from ActionListener interface because you're implementing the ActionListener interface.
First you could implement the actionPerformed method, and do like this
#override
public void actionPerformed(ActionEvent arg0) {
}
Then you can just add action listener.
ok.addActionListener(this);
Second you could just remove the implementing the ActionListener at all, and keep your class like:
public class ex12 extends JFrame {
//rest of your code.

if you want to write your own ActionListener try this:
public class Example extends JFrame {
private JButton ok = new JButton("ok");
public Example() {
ok.addActionListener(new OwnActionListener());
}
private class OwnActionListener implements ActionListener {
#Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
}
}
}
Or you can just implement the Interface like that:
public class Example extends JFrame implements ActionListener {
private JButton ok = new JButton("ok");
public Example() {
ok.addActionListener(this);
}
#Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
}
}

Using Radio Buttons to set labels in Java

So for class I'm suppose to make a Celsius to Fahrenheit converter GUI. With that said, it's a pretty simple and easy program to create. I want to do more with it though. What I want to do is have one window that changes depending on which radio button is selected in a buttongroup. I want the selected radiobutton for "To Fahrenheit" or "To Celsius" to update the labels for the input and output. I have tried using an actionlistener for when one is selected, but it doesn't change the labels. Am I using the wrong listener? What's the correct way to do this?
Here's my code:
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;
public class Converter extends JFrame {
private JPanel contentPane;
private JTextField tfNumber;
private JLabel lblCelsius;
private JLabel lblFahrenheit;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Converter frame = new Converter();
frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public Converter() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
setTitle("Celsius Converter");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 308, 145);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
tfNumber = new JTextField();
tfNumber.setText("0");
tfNumber.setBounds(10, 11, 123, 20);
contentPane.add(tfNumber);
tfNumber.setColumns(10);
lblCelsius = new JLabel("Celsius");
lblCelsius.setFont(new Font("Tahoma", Font.BOLD, 15));
lblCelsius.setBounds(143, 12, 127, 14);
contentPane.add(lblCelsius);
lblFahrenheit = new JLabel("Fahrenheit");
lblFahrenheit.setBounds(187, 46, 95, 14);
contentPane.add(lblFahrenheit);
final JLabel lblNum = new JLabel("32.0");
lblNum.setBounds(143, 46, 43, 14);
contentPane.add(lblNum);
final JRadioButton rdbtnF = new JRadioButton("to Fahrenheit");
rdbtnF.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(rdbtnF.isSelected()) {
lblCelsius.setText("Celsius");
lblFahrenheit.setText("Fahrenheit");
}
}
});
rdbtnF.setSelected(true);
rdbtnF.setBounds(10, 72, 109, 23);
contentPane.add(rdbtnF);
final JRadioButton rdbtnC = new JRadioButton("to Celsius");
rdbtnC.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(rdbtnF.isSelected()) {
lblCelsius.setText("Fahrenheit");
lblFahrenheit.setText("Celsius");
}
}
});
rdbtnC.setBounds(121, 72, 109, 23);
contentPane.add(rdbtnC);
ButtonGroup bg = new ButtonGroup();
bg.add(rdbtnF);
bg.add(rdbtnC);
JButton btnConvert = new JButton("Convert");
btnConvert.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if(rdbtnF.isSelected()) {
String num = String.valueOf(convertToF(tfNumber.getText()));
lblNum.setText(num);
}
if(rdbtnC.isSelected()) {
String num = String.valueOf(convertToC(tfNumber.getText()));
lblNum.setText(num);
}
}
});
btnConvert.setBounds(10, 42, 123, 23);
contentPane.add(btnConvert);
}
private double convertToF(String celsius) {
double c = Double.parseDouble(celsius);
double fahren = c * (9/5) + 32;
return fahren;
}
private double convertToC(String fahren) {
double f = Double.parseDouble(fahren);
double celsius = (f - 32) * 5 / 9;
return celsius;
}
}

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Java – How do I use counter data for analytics? - java

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Frame active, but setting visible to false = nullpointer

when i am writing ActionListener this one should be error public class ex12 extends JFrame implements ActionListene

Using Radio Buttons to set labels in Java

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