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How is JFrame.setResizable supposed to be used?

I'm trying to followed java tutorials and now I am going over JFrame.
This is a information inquiry more than help question.
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Login {
public static void main(String[] args){
//Creating object of LoginFrame class and setting some of its properties
LoginFrame frame = new LoginFrame();
frame.setTitle("LoginForm");
frame.setVisible(true);
frame.setBounds(10, 10, 370, 600);
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
This code will cause the frame to be resized to a very small size at the top left corner regardless of the bounds I set.
A simple fix for this is to place frame.setResizable() before setting its bounds.
Does anyone know why this happens or am I doing something wrong?
I'm also on Ubuntu 20.04, maybe this matters but I haven't found an answer.
Tutorial shows above code.
The following is the code for LoginFrame
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
//Creating LoginFrame class
public class LoginFrame extends JFrame implements ActionListener {
//Creating constructor of LoginFrame() class
LoginFrame(){
}
//Overriding actionPerformed() method
#Override
public void actionPerformed(ActionEvent e){
}
}
Like I was saying I was only following a tutorial. This was only the beginning of the tutorial but I had the same issue when starting another very simple frame tutorial.

The following works fine for me :
import javax.swing.*;
class Scratch extends JFrame {
public Scratch() {
super();
}
public static void main(String[] args){
//Creating object of LoginFrame class and setting some of its properties
Scratch frame = new Scratch();
frame.setTitle("LoginForm");
frame.setVisible(true);
frame.setBounds(10, 10, 370, 600);
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
Result : I see a big rectangular window - in the shape of a smart phone screen I'd say.
setResizable(false) means you cannot resize the frame. I suspect the problem you're trying to identify lies somewhere in the LoginFrame class... no code for this was included though so hard to comment furhter.

Display transparent text from Java program

I want to create a Java application that displays text on the screen, in such a way that it is not contained in any form or canvas, at least not any visible one, but rather just display it on top of the thing that is currently displaying on the computer.
I'd prefer to use it in pure Java, but I guess if there is some third party library or compiled C API's then that's fine too.
If possible then I'd also like something like Ubuntu's Always on top feature, so that if I click some other window the text still is displayed on top of it.
Is there any way to make JFrames transparent?
This is kind of what I'm aiming for, only doing it in Java
http://2.bp.blogspot.com/-QkxT8pC17nw/T1n_rlr20aI/AAAAAAAAAj0/xbJjYObc4Bw/s1600/screenCaptureRainmeter.png

Conceptually, you problem basically boils down to making the window transparent. To that end you should start by looking at How to Create Translucent and Shaped Windows
The next thing to keep in mind is the fact that most Swing component's are opaque by default, so just beware of that
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setUndecorated(true);
frame.setBackground(new Color(0, 0, 0, 0));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setOpaque(false);
setLayout(new GridBagLayout());
JLabel label = new JLabel("I'm on top");
label.setFont(label.getFont().deriveFont(Font.BOLD, 64));
label.setForeground(Color.WHITE);
add(label);
}
}
}
You may also want to have a look at Window#setAlwaysOnTop

JDialog in center of screen instead of desired center of JApplet

In my Java applet I have JDialog with couple of radioButtons.
The problem is that this applet is of dimensions 700x300 and the JDialog appears in the center of screen. I want this JDialog to appear in the center of JApplet layout. My constructor invocation looks like this:
final JDialog dialog = new JDialog(
SwingUtilities.windowForComponent(GUIComponentContainer.getInstance().getDocumentTable()),
I18nCommonsImpl.constants.selectCertificate(), ModalityType.APPLICATION_MODAL);
This method:
GUIComponentContainer.getInstance().getDocumentTable()
returns JTable component which is a child of my JApplet.
I also used JDialog "setLocationRelativeTo" method:
dialog.setLocationRelativeTo(GUIComponentContainer.getInstance().getApplet());
None of these seem to work. Is there any other way to accomplish my goal?
I searched along SO for similar questions, but didn't see any working solutions.
Thanks in advance.

Getting the Window for the applet works for me, at least when the applet is launched in Eclipse. For example:
import java.awt.Dimension;
import java.awt.Window;
import java.awt.Dialog.ModalityType;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.Box;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
#SuppressWarnings("serial")
public class AppletCentering extends JApplet {
#Override
public void init() {
final JPanel panel = new JPanel();
panel.add(new JButton(new AbstractAction("Press Me") {
#Override
public void actionPerformed(ActionEvent e) {
Window win = SwingUtilities.getWindowAncestor(panel);
System.out.println("win class: " + win.getClass().getCanonicalName());
JDialog dialog = new JDialog(win, "My Dialog", ModalityType.APPLICATION_MODAL);
dialog.add(Box.createRigidArea(new Dimension(200, 200)));
dialog.pack();
dialog.setLocationRelativeTo(win);
dialog.setVisible(true);
}
}));
add(panel);
}
}
But having said this, your question begs the question: why are you even coding for an applet? These have been out of favor for years, and just recently has lost support from Oracle who has decided to finally drop applet browser plug in support.

How To Add JLabel to Already Existing Jframe?

lol i dont even know if i worded that right
i am a really new programmer and this is my code for the main class:
package culminatingnew;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
public class CulminatingNew {
public static void main(String[] args) {
Container container = null;
JFrame jframe = new JFrame("Math Adventure");
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jframe.setLocationRelativeTo(null);
jframe.setBounds (150, 0, 1000, 1000);
jframe.setBackground(Color.blue);
jframe.setVisible(true);
JLabel labelText = new JLabel("Welcome!");
jframe.getContentPane().add(new CharacterChoose());//
jframe.setVisible(true);
jframe.getContentPane().add(labelText);
jframe.setVisible(true);
So basically, I'm making a game. In another class in the assignment package is CharacterChoose, where the user is greeted with a picture of their character. All I want to do is add text to this same screen saying "Welcome", but whenever I try this it just ignores the CharacterChoose screen and opens a new blank frame that says "Welcome". Is there any way to fix this?

GUI's are not linear/procedural programs, the are event driven, that is, something happens and you respond to it.
Instead, maybe consider using a button saying "Continue" or something, which the user must press, once pressed, you can then present the next view.
I'd recommend having a look at CardLayout for easier management of switching between views.
See How to Use Buttons, Check Boxes, and Radio Buttons, How to Write an Action Listeners and How to Use CardLayout for more details

Can't dispose of jframe window?

I'm trying to dispose of the difficulty window after any one of the difficulty button's are clicked but it won't happen. I've tried .dispose and frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); but i can't get it. Is it just placement or more?
import java.awt.FlowLayout;
import java.awt.event.*;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.GridLayout;
public class Game extends JFrame{
public static JFrame frame = new JFrame();
private JLabel lab;
public static void main(String[] args) {
Game difficulty = new Game();
difficulty.setSize(350,105);
difficulty.setTitle("Difficulty.");
difficulty.setVisible(true);
difficulty.setLocationRelativeTo(null);
/**Game sudoku = new Game();
sudoku.setSize(900, 900);
sudoku.setVisible(false);*/
}
public Game(){
setLayout(new FlowLayout());
lab = new JLabel("Please select your difficulty.");
add(lab);
JButton easy;
easy = new JButton("Easy");
add(easy);
easy.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
//Execute when button is pressed
System.out.println("You clicked the button");
JFrame.dispose();
}
});
JButton medium;
medium = new JButton("Medium");
add(medium);
JButton hard;
hard = new JButton("Hard");
add(hard);
JButton evil;
evil = new JButton("Evil!");
add(evil);
}
}

First of all you're extending JFrame and creating an object of JFrame, if I'm not wrong, this shouldn't be done.
public class Game extends JFrame{
public static JFrame frame = new JFrame();
And as #Salah said, JFrame is not static, so it should be:
public JFrame frame = new JFrame();
To solve your problem, you're disposing a new JFrame (yes, you have 3 JFrames in one class, instead of 1, which is what you want), with: JFrame.dispose(); if you already created an object or you're extending JFrame, you can:
this.dispose(); //For the extended JFrame
or
frame.dispose(); //For the object you created

dispose() method is not a static, so it'll not work by calling it directly from JFrame class
JFrame.dispose();
try to do :
dispose();
Or to dispose the frame object you have created
frame.dispose();
Read more about JFrame

I had the same problem:
this.dispose();
solved my problem.

Try setting the jFrame to invisible before disposing it:
public void disposeJFrame(JFrame frame){
frame.setVisible(false);
frame.dispose();
}

If you're wanting to close the whole program, you can use System.exit(0);

Instead JFrame.dispose();, use frame.dispose() or JFrame.this.dispose();