NOTE: My English isn't the best so Please Don't mind too much Grammar Mistakes.
Hey there, Java Starter here, Anyways i was Testing a mini "beta" version of the Program i'm planning to code, So i made a TextField And it wont go Under my JLabel i made, i tried to use BorderLayout.PAGE_END to get it under / at the bottom but it won't get it. Here's the Code:
package test;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TextTest {
private static TextField field;
private static void createGUI() {
Font a = new Font(null, Font.BOLD, 0);
Font size = a.deriveFont(20f);
JLabel test = new JLabel("");
test.setPreferredSize(new Dimension(200,200));
test.setText("<html> Welcome to the EMOJI Translator! Type the <br> Emoji in the Text Area And hit Enter! and it will say What the emoji means! <html>");
test.setFont(size);
field = new TextField(2);
field.setSize(new Dimension(200,200));
field.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String test = field.getText();
String search1 = ":D";
if(test.equals(search1)) {
System.out.println("This is an Happy Smiley.");
}
}});
JFrame b = new JFrame("TEST");
b.setLocationRelativeTo(null);
b.setPreferredSize(new Dimension(350,350));
b.setLayout(new FlowLayout());
b.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
b.getContentPane().add(field, BorderLayout.PAGE_END);
b.getContentPane().add(test, BorderLayout.CENTER);
b.pack();
b.setVisible(true);
}
public static void main(String[] args) {
createGUI();
}
}
Here's a Link to the screenshot of how it ended looking in my Computer:
http://imgur.com/y988zUx
If you know Whats wrong please respond to this question.
You are trying to use properties of BorderLayout for a gui make with FlowLayout. In Java, you cannot mix different layout managers, by doing this the layout properties will be ignored.
You should set you layout manager to BorderLayout, so it accepts your properties:
b.setLayout(new BorderLayout());
Related
So I am creating a project that is a skeleton of a Java GUI but I am having some alignment issues. When I run my code the centered top text that says "Help Page" is pushed to the left side, while the help string is shifted downwards a little bit but also pushed to the right.
My goal is to have the top text centered and underlined with the other text below it and also centered. I have tried using multiple panels but still nothing has worked, Im guessing it's the mismatching font size by I dont know. Any help is appreciated!
private void helpGUI() {
clearGUI();
helpStr = "<html><br>This is the help page where the user can come for help<html/>";
label = new JLabel("<html><u>Help Page</u></html>");
label.setFont(new Font("Times", Font.PLAIN, 24));
helpTxt = new JLabel(helpStr);
helpTxt.setFont(new Font("Times", Font.PLAIN, 16));
panel.add(label);
panel.add(helpTxt);
panel.setAlignmentX(CENTER_ALIGNMENT);
button = new JButton("Previous");
bttnPanel.setLayout(new FlowLayout(FlowLayout.RIGHT));
bttnPanel.add(button);
frame.add(panel);
class previousButton implements ActionListener {
public void actionPerformed (ActionEvent e) {
GUIPG1(name);
}
}
button.addActionListener(new previousButton());
}
It really depends on what you are trying to achieve (for instance, what other components is that JPanel supposed to contain. Is it just those two labels? You show a button in your code as well. Where is that supposed to be added?). Regardless, for that specific panel with the two texts on the top, you could use BoxLayout for adding your JLabels vertically, and use setAlignmentX() to set the horizontal alignment of the texts. Example below:
Edit:
Alternatively (regarding underlying and centering the text), you can use the following in the example below:
titleLbl = new JLabel("<html><u>Help Page</u></html>", SwingConstants.CENTER);
titleLbl.setFont(new Font("Times New Roman", Font.PLAIN, 24));
titleLbl.setAlignmentX(JLabel.CENTER_ALIGNMENT);
App.java
import java.awt.*;
import java.awt.font.*;
import javax.swing.*;
import java.util.*;
public class App {
private void addComponentsToPane(Container pane) {
JLabel titleLbl = new JLabel("Help Page");
// add text attributes (i.e., underline, font family, font size, etc)
Font font = titleLbl.getFont();
Map<TextAttribute, Object> attributes = new HashMap<>(font.getAttributes());
attributes.put(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON);
attributes.put(TextAttribute.FAMILY, "Times New Roman");
attributes.put(TextAttribute.SIZE, 24);
titleLbl.setFont(font.deriveFont(attributes));
titleLbl.setAlignmentX(JLabel.CENTER_ALIGNMENT);
JLabel infoLbl = new JLabel("This is the help page where the user can come for help");
infoLbl.setAlignmentX(JLabel.CENTER_ALIGNMENT);
infoLbl.setFont(new Font("Times New Roman", Font.PLAIN, 16));
Box box = new Box(BoxLayout.Y_AXIS);
box.add(titleLbl);
box.add(Box.createRigidArea(new Dimension(0, 5)));// creates space between the JLabels
box.add(infoLbl);
pane.add(box, BorderLayout.NORTH);
}
private void createAndShowGUI() {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
addComponentsToPane(frame.getContentPane());
frame.setSize(640, 480);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
new App().createAndShowGUI();
}
});
}
}
Im creating a programme using java. I want the user to enter some text, then push the button so the text entered shows in the label. However, I have 2 problems. First, the text are isn´t displaying when I execute the app. Second, I don´t know how to allow the user to type in the area. Im new in java so that´s why Im asking. Here is the code. Thank you.
import javax.swing.*;
import java.awt.event.*;
class Boton extends JFrame implements ActionListener {
JButton boton;
JTextArea textArea = new JTextArea();
JLabel etiqueta = new JLabel();
public Boton() {
setLayout(null);
boton = new JButton("Escribir");
boton.setBounds(100, 150, 100, 30);
boton.addActionListener(this);
add(boton);
}
#Override
public void actionPerformed(ActionEvent e) {
if (e.getSource() == boton) {
try {
String texto = textArea.getText();
etiqueta.setText(texto);
Thread.sleep(3000);
System.exit(0);
} catch (Exception excep) {
System.exit(0);
}
}
}
}
public class Main{
public static void main(String[] ar) {
Boton boton1 =new Boton();
boton1.setBounds(0,0,450,350);
boton1.setVisible(true);
boton1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
Problems:
You never add the JTextArea into your GUI, and if it doesn't show, a user cannot directly interact with it.
You are calling Thread.sleep on the Swing event thread, and this will put the entire application to sleep, meaning the text that you added will not show.
Other issues include use of null layouts and setBounds -- avoid doing this.
Solutions:
Set the JTextArea's column and row properties so that it sizes well.
Since your JTextArea's text is going into a JLabel, a component that only allows a single line of text, I wonder if you should be using a JTextArea at all. Perhaps a JTextField would work better since it allows user input but only one line of text.
Add the JTextArea to a JScrollPane (its viewport actually) and add that to your GUI. Then the user can interact directly with it. This is most easily done by passing the JTextArea into a JScrollPane's constructor.
Get rid of the Thread.sleep and instead, if you want to use a delay, use a Swing Timer. check out the tutorial here
For example:
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Window;
import java.awt.event.KeyEvent;
import javax.swing.*;
public class Main2 {
public static void main(String[] args) {
// create GUI in a thread-safe manner
SwingUtilities.invokeLater(() -> createAndShowGui());
}
private static void createAndShowGui() {
BotonExample mainPanel = new BotonExample();
JFrame frame = new JFrame("GUI");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
}
class BotonExample extends JPanel {
private JLabel etiqueta = new JLabel(" ");
private JButton boton = new JButton("Escribir");
// jtext area rows and column properties
private int rows = 5;
private int columns = 30;
private JTextArea textArea = new JTextArea(rows, columns);
public BotonExample() {
// alt-e will activate button
boton.setMnemonic(KeyEvent.VK_E);
boton.addActionListener(e -> {
boton.setEnabled(false); // prevent button from re-activating
String text = textArea.getText();
etiqueta.setText(text);
// delay for timer
int delay = 3000;
Timer timer = new Timer(delay, e2 -> {
// get current window and dispose ofit
Window window = SwingUtilities.getWindowAncestor(boton);
window.dispose();
});
timer.setRepeats(false);
timer.start(); // start timer
});
// create JPanels to add to GUI
JPanel topPanel = new JPanel(new FlowLayout(FlowLayout.LEADING, 5, 5));
topPanel.add(new JLabel("Etiqueta:"));
topPanel.add(etiqueta);
JPanel bottomPanel = new JPanel();
bottomPanel.add(boton);
JScrollPane scrollPane = new JScrollPane(textArea);
// use layout manager and add components
setLayout(new BorderLayout());
add(topPanel, BorderLayout.PAGE_START);
add(scrollPane, BorderLayout.CENTER);
add(bottomPanel, BorderLayout.PAGE_END);
}
}
textarea.setText("Text"); // this will insert text into the text area
textarea.setVisable(true); // this will display the text area so you can type in it
textarea.setSize(500,500); // set size of the textarea so it actually shows
The user should be able to type in the TA when it is displayed and just do a getText to pull the text
I'm trying to make a little game that will first show the player a simple login screen where they can enter their name (I will need it later to store their game state info), let them pick a difficulty level etc, and will only show the main game screen once the player has clicked the play button. I'd also like to allow the player to navigate to a (hopefully for them rather large) trophy collection, likewise in what will appear to them to be a new screen.
So far I have a main game window with a grid layout and a game in it that works (Yay for me!). Now I want to add the above functionality.
How do I go about doing this? I don't think I want to go the multiple JFrame route as I only want one icon visible in the taskbar at a time (or would setting their visibility to false effect the icon too?) Do I instead make and destroy layouts or panels or something like that?
What are my options? How can I control what content is being displayed? Especially given my newbie skills?
A simple modal dialog such as a JDialog should work well here. The main GUI which will likely be a JFrame can be invisible when the dialog is called, and then set to visible (assuming that the log-on was successful) once the dialog completes. If the dialog is modal, you'll know exactly when the user has closed the dialog as the code will continue right after the line where you call setVisible(true) on the dialog. Note that the GUI held by a JDialog can be every bit as complex and rich as that held by a JFrame.
Another option is to use one GUI/JFrame but swap views (JPanels) in the main GUI via a CardLayout. This could work quite well and is easy to implement. Check out the CardLayout tutorial for more.
Oh, and welcome to stackoverflow.com!
Here is an example of a Login Dialog as #HovercraftFullOfEels suggested.
Username: stackoverflow Password: stackoverflow
import java.awt.*;
import java.awt.event.*;
import java.util.Arrays;
import javax.swing.*;
public class TestFrame extends JFrame {
private PassWordDialog passDialog;
public TestFrame() {
passDialog = new PassWordDialog(this, true);
passDialog.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new TestFrame();
frame.getContentPane().setBackground(Color.BLACK);
frame.setTitle("Logged In");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
}
});
}
}
class PassWordDialog extends JDialog {
private final JLabel jlblUsername = new JLabel("Username");
private final JLabel jlblPassword = new JLabel("Password");
private final JTextField jtfUsername = new JTextField(15);
private final JPasswordField jpfPassword = new JPasswordField();
private final JButton jbtOk = new JButton("Login");
private final JButton jbtCancel = new JButton("Cancel");
private final JLabel jlblStatus = new JLabel(" ");
public PassWordDialog() {
this(null, true);
}
public PassWordDialog(final JFrame parent, boolean modal) {
super(parent, modal);
JPanel p3 = new JPanel(new GridLayout(2, 1));
p3.add(jlblUsername);
p3.add(jlblPassword);
JPanel p4 = new JPanel(new GridLayout(2, 1));
p4.add(jtfUsername);
p4.add(jpfPassword);
JPanel p1 = new JPanel();
p1.add(p3);
p1.add(p4);
JPanel p2 = new JPanel();
p2.add(jbtOk);
p2.add(jbtCancel);
JPanel p5 = new JPanel(new BorderLayout());
p5.add(p2, BorderLayout.CENTER);
p5.add(jlblStatus, BorderLayout.NORTH);
jlblStatus.setForeground(Color.RED);
jlblStatus.setHorizontalAlignment(SwingConstants.CENTER);
setLayout(new BorderLayout());
add(p1, BorderLayout.CENTER);
add(p5, BorderLayout.SOUTH);
pack();
setLocationRelativeTo(null);
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
addWindowListener(new WindowAdapter() {
#Override
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
jbtOk.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
if (Arrays.equals("stackoverflow".toCharArray(), jpfPassword.getPassword())
&& "stackoverflow".equals(jtfUsername.getText())) {
parent.setVisible(true);
setVisible(false);
} else {
jlblStatus.setText("Invalid username or password");
}
}
});
jbtCancel.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
setVisible(false);
parent.dispose();
System.exit(0);
}
});
}
}
I suggest you insert the following code:
JFrame f = new JFrame();
JTextField text = new JTextField(15); //the 15 sets the size of the text field
JPanel p = new JPanel();
JButton b = new JButton("Login");
f.add(p); //so you can add more stuff to the JFrame
f.setSize(250,150);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Insert that when you want to add the stuff in. Next we will add all the stuff to the JPanel:
p.add(text);
p.add(b);
Now we add the ActionListeners to make the JButtons to work:
b.addActionListener(this);
public void actionPerforemed(ActionEvent e)
{
//Get the text of the JTextField
String TEXT = text.getText();
}
Don't forget to import the following if you haven't already:
import java.awt.event*;
import java.awt.*; //Just in case we need it
import java.x.swing.*;
I hope everything i said makes sense, because sometimes i don't (especially when I'm talking coding/Java) All the importing (if you didn't know) goes at the top of your code.
Instead of adding the game directly to JFrame, you can add your content to JPanel (let's call it GamePanel) and add this panel to the frame. Do the same thing for login screen: add all content to JPanel (LoginPanel) and add it to frame. When your game will start, you should do the following:
Add LoginPanel to frame
Get user input and load it's details
Add GamePanel and destroy LoginPanel (since it will be quite fast to re-create new one, so you don't need to keep it memory).
I'm trying to make button show a message when pressed, it's not working. Can anyone tell me what I missed?
In the end I have the KeyListener and the if for JOptionPane, but the website is not letting me post it (I'm new to this).
Anyway, it would be really nice if someone could tell me what I'm doing wrong, thanks.
public javalearning(){
FlowLayout f = new FlowLayout();
setLayout(f);
this.setSize(200,200);
JFrame j = new JFrame();
this.setTitle("this is a tittle");
JButton button = new JButton();
button.setText("Button");
this.add(button);
JButton button2 = new JButton();
button2.setText("Button2");
this.add(button2);
this.setVisible(true);
}
please follow example in this code and you will be fine. If at the end of the day you are unable to resolve it. you can write back. i believe this will help you.
import javax.swing.*;
import java.awt.event.*;
public class ChangeButtonLabel{
JButton button;
public static void main(String[] args){
ChangeButtonLabel cl = new ChangeButtonLabel();
}
public ChangeButtonLabel(){
JFrame frame = new JFrame("This is a Frame");
button = new JButton("Button");
button.addActionListener(new MyAction());
frame.add(button);
frame.setSize(400, 400);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public class MyAction implements ActionListener{
public void actionPerformed(ActionEvent e){
String text = (String)e.getActionCommand();
if (text.equals("Button2")){
button.setText("I am Sectona");
}
else{
button.setText("Click Me");
}
}
}
}
You state:
In the end I have the KeyListener and the if for JOptionPane,
As the tutorial that I've linked to in my comment will explain, you don't use KeyListeners with JButtons but rather ActionListeners.
e.g.,
myButton.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent evt) {
System.out.println("Button pressed");
}
});
You state:
but the website is not letting me post it (I'm new to this).
This site will let you post any reasonable amount of code. If you're having problems posting it, tell us the specifics of what's wrong, and maybe we can help you. Again, if you're trying to post code as an image, don't. It should be text that is formatted as code, not an image. But most important, don't keep us in the dark, or we can't help you.
like Hovercraft said, you will need to set ImagIcon(String image_name)
The code below will help you in embedding image on JButton. Give me a shout if you still find it difficult to integrate
import javax.swing.*;
import java.awt.*;
public class IconButton{
public static void main(String[] args){
JFrame frame = new JFrame("Icon on button");
JButton button = new JButton("Image button fro Sectona");
Icon imgicon = new ImageIcon("sectona.gif");
JPanel panel = new JPanel();
button.setIcon(imgicon);
panel.add(button);
frame.add(panel, BorderLayout.NORTH);
frame.setSize(400, 400);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
I'm a beginner in Java, especially in the GUI Design area. I created a simple Java Swing interface to accept a string from the user and display it using a JOptionPane (ActionListener not yet implemented.)
The main problem I'm facing is with the alignment of the objects in the output. No matter what bounds I give to the objects, they always appear in one line. Also, sometimes, the output Frame will show absolutely nothing. After multiple runs, it will finally show me the objects, but not in the layout I expected them to be.
This is my code:
package guiapp;
import javax.swing.*;
import java.awt.*;
public class GUIApp {
private static JFrame frame;
private static JPanel panel;
private static JLabel label;
private static JTextField text;
private static JButton click;
public static void CreateGUI(){
frame = new JFrame("Hello to NetBeans!");
frame.setSize(750, 750);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
panel = new JPanel();
panel.setBackground(Color.BLUE);
label = new JLabel("Enter a string: ");
label.setBounds(50,35,150,40);
label.setVisible(true);
text = new JTextField();
text.setBounds(250,35,150,40);
text.setVisible(true);
click = new JButton("Click here!");
click.setBounds(150,80,150,40);
click.setVisible(true);
panel.add(text);
panel.add(label);
panel.add(click);
frame.add(panel);
frame.setVisible(true);
}
public static void main(String[] args) {
CreateGUI();
}
}
Can someone please tell me where I'm going wrong? I seem to have got the layout syntax wrong.
No matter what bounds I give to the objects, they always appear in one
line.
This is probably because of the default layout manager of JPanel: FlowLayout. On the other hand Swing is designed to be used with layout managers and the use of methods such as setBounds(...), setLocation(...) and setSize(...) is discouraged. See Laying out Components within a Container lesson.