Develop Reference

Jframe is setting everything in the middle of the screen

My Jframe is setting every component at the middle of the screen even if i set a specific location...
for exmaple, the button and the searchbar are right next to each other.
Here is the image of the program:
thanks!
It really seems easy but i can't figure out why it doesn't work
private String msg;
private JFrame frame;
private JButton button;
private JPanel panel;
private JTextField searchBar;
private JLabel name;
private JLabel logo;
public GUI() {
this.frame = new JFrame();
this.panel = new JPanel();
this.panel.setBorder(BorderFactory.createEmptyBorder(300, 300, 300, 300));
//this.panel.setLayout(new GridLayout(10, 10));
this.frame.add(panel, BorderLayout.CENTER);
this.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.frame.setTitle("emdb (ezon's movie database)");
Icon icon = new ImageIcon("images/search.png");
this.button = new JButton(icon);
this.button.setBounds(100, 20, 25, 25);
this.button.addActionListener(this);
this.searchBar = new JTextField(30);
this.searchBar.setBounds(100, 20, 200, 25);
this.name = new JLabel();
this.name.setBounds(50, 20, 80, 25);
ImageIcon log = new ImageIcon("images/logo.png");
this.logo = new JLabel(log);
this.logo.setBounds(100, 0, 300, 150);
}
public void clearScreen() {
this.panel.removeAll();
this.panel.revalidate();
this.panel.repaint();
}
public void searchScreen() {
this.panel.add(this.searchBar);
this.panel.add(this.button);
this.panel.add(this.logo);
this.frame.pack();
this.frame.setVisible(true);
}
public void searchedScreen() {
this.panel.add(this.name);
}
public String getMsg() {
return(this.msg);
}
#Override
public void actionPerformed(ActionEvent e) {
System.out.println("Searched: " + this.searchBar.getText());
this.name.setText(this.searchBar.getText());
this.msg = this.searchBar.getText();
clearScreen();
searchedScreen();
}

Swing was designed to be used with layout managers.
even if i set a specific location.
The job of the layout manager is to set the size and location of the component based on the rules of the layout manager. So your setBounds() statements will be overridden. Don't attempt to use setBounds().
the button and the searchbar are right next to each other
The default layout manager for a JPanel is the FlowLayout, which does exactly that.
this.frame.add(panel, BorderLayout.CENTER);
Change the above statement to:
this.frame.add(panel, BorderLayout.PAGE_START);
to see a difference.
Read the section from the Swing tutorial on Layout Managers for more information and examples. Decide which layout manager (or combination of layout managers on different panels) will achieve your desired layout.

how to make jpanel in jframe visible

I try to write a menue for a little game in Java. I thought it would be a good idea to have a Window class (extending JFrame) and then put a JPanel in it for the different Screens (Menue, Game, GameOver etc)
If I put the buttons and stuff directly in the JFrame everything is shwown correct, but when I try to put a JPanel into the JFrame it doesn't work. Here is the code:
public class Window extends JFrame{
private final int WIDTH = 800;
private final int HEIGTH = 600;
private final int QUADRAT = 50;
JButton startButton;
JButton exitButton;
JButton anleitungButton;
JLabel gameTitle;
public Window() {
super("Study Run");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(null);
setSize(WIDTH, HEIGTH);
setResizable(false);
getContentPane().add(new MenuePanel());
setVisible(true);
setLocationRelativeTo(null);
}
And this is my Panel:
public class MenuePanel extends JPanel{
JButton startButton;
JButton exitButton;
JButton anleitungButton;
JLabel gameTitle;
public MenuePanel() {
super();
setBackground(Color.CYAN);
gameTitle = new JLabel("StudyRun", SwingConstants.CENTER);
gameTitle.setBounds(200, 25, 400, 75);
gameTitle.setFont(new Font("Arial", Font.ITALIC, 36));
add(gameTitle);
startButton = new JButton("start");
startButton.setBounds(325, 125, 150, 50);
add(startButton);
anleitungButton = new JButton("anleitung");
anleitungButton.setBounds(325, 200, 150, 50);
add(anleitungButton);
exitButton = new JButton("exit");
exitButton.setBounds(325, 450, 150, 50);
add(exitButton);
CloseListener closeListener = new CloseListener();
StartListener startListener = new StartListener();
AnleitungListener anleitungListener = new AnleitungListener();
startButton.addActionListener(startListener);
anleitungButton.addActionListener(anleitungListener);
exitButton.addActionListener(closeListener);
}
The only help I found online was, that I needed to add the panel before I set the frame visible. That didn't work. Putting pack() or revalidate() anywhere in the code didn't work either. Also setting the Panel on opaque or visible didn't do anything. I don't know what else to try?!

Your problem is here:
setLayout(null);
When you use null layouts, you the coder are completely responsible for the location and size of all added components. Your added component has no size and so defaults to 0, 0.
A (bad) solution: give the MenuePanel a size or bounds
A much better solution: learn and use the layout managers (as all your searches most assuredly already told you).

It's best to remember that Java uses Flowlayout() as a default.
public Window() {
setLayout(new FlowLayout());
}
So your basically overwriting the layout to null as explained in the previous answer.Also if you plan to use different class and panels to add to a JFrame from different classes use a getter
class SomePanel{
public JComponent getPanel(){
return panel;
}
}
Then add to JFrame..
class MyFrame{
add(new SomePanel().getPanel());
}

JAVA JTextField doesnt show up

So Im trying to make a little program to calculate the area of a specific shape.
The user should be able to make a input via a textfield (Like the height and stuff of the shapes). The he should press a button and the price should get printed.
But it doesnt show up.
Code:
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class Rechner extends JFrame implements ActionListener{
private static JButton button1;
private static JButton button2;
private static JButton button3;
private static JButton button4;
private static JTextField numberField;
private JPanel jpanel;
public Rechner(String titel){
super(titel);
jpanel = new JPanel();
numberField = new JTextField(1500);
add(numberField, BorderLayout.CENTER);
button1 = new JButton("Rechteck");
button1.setBounds(10, 10, 150, 30);
button1.addActionListener(this);
add(button1);
button2 = new JButton("Dreieck");
button2.setBounds(170, 10, 150, 30);
button2.addActionListener(this);
add(button2);
button3 = new JButton("Trapez");
button3.setBounds(330, 10, 150, 30);
button3.addActionListener(this);
add(button3);
button4 = new JButton("Parallelogramm");
button4.setBounds(490, 10, 150, 30);
button4.addActionListener(this);
add(button4);
setResizable(false);
}
public static void main(String[] args) {
Rechner frame = new Rechner("Menu");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(660, 400);
frame.setLayout(null);
frame.setVisible(true);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() == button1){
System.out.println("fff");
}
String numberStr = numberField.getText();
}
}

The default layout manager of a JFrame (well, of its content pane in fact) is BorderLayout.
Without specified constraints , the component is added to BorderLayout.CENTER, so
add(component);
is the same as
add(component, BorderLayout.CENTER);
and each component added this way will replace the last component added to the center.
Also note that setBounds will have no effect if there is a layout manager, and that you create a JPanel that you never use.
Finally, you may want to have a look at this guide : A Visual Guide to Layout Managers

This line is mainly the problem:
add(numberField, BorderLayout.CENTER);
Is causing the TextField to fill the entire space. Then, the next time you add a component to the JFrame with BorderLayout.CENTER, the JTextField gets replaced. To fix this:
super(titel);
jpanel = new JPanel();
add(jpanel, BorderLayout.NORTH); //adding the jpanel
button1 = new JButton("Rechteck");
jpanel.add(button1);
button1.setBounds(10, 10, 150, 30);
//adding the other buttons to the JPanel...
//...
//...
button4.addActionListener(this);
button3.addActionListener(this);
button2.addActionListener(this);
button1.addActionListener(this);
numberField = new JTextField(1500);
add(numberField);//this will cause it to fill the remaining space
setResizable(false);
Explanation:
The buttons should go into the JPanel you created, and the JPanel should go into the JFrame's NORTH. That way they don't cover the JFrame

Java Open a new window by clicking a button

Been sitting here at my computer for about 13 hours and I think my eyes are bleeding.
I found a little gui editor I love called GuiGenie.
It works perfect for creating the window with the buttons and all that good stuff.
The problem is i want to click a button in my first menu and have it open my other menu i made.
I just starting programming 4 weeks ago so I'm a complete noob.
I have a feeling its messing up because of the main methods but I have no idea and 13 hours of sitting here trying millions of things is making me go crazy : )
here is what i got so far
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class MyPanel extends JPanel {
private JTextField How;
private JLabel jcomp2;
private JLabel jcomp3;
private JButton jcomp4;
public MyPanel() {
//construct components
How = new JTextField (1);
jcomp2 = new JLabel ("How long were you parked?");
jcomp3 = new JLabel ("Minutes");
jcomp4 = new JButton ("openNewWindow");
//adjust size and set layout
setPreferredSize (new Dimension (315, 85));
setLayout (null);
//add components
add (How);
add (jcomp2);
add (jcomp3);
add (jcomp4);
//set component bounds (only needed by Absolute Positioning)
How.setBounds (245, 50, 60, 25);
jcomp2.setBounds (35, 30, 185, 50);
jcomp3.setBounds (250, 30, 60, 20);
jcomp4.setBounds (0, 0, 315, 25);
jcomp4.addActionListener( new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
}
});
}
public static void main (String[] args) {
JFrame frame = new JFrame ("MyPanel");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add (new MyPanel());
frame.pack();
frame.setVisible (true);
}
}
When the button is pressed, I want it to open this new window
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class MyPanel2 extends JPanel {
private JButton jcomp1;
private JButton jcomp2;
private JButton jcomp3;
private JTextField jcomp4;
public MyPanel2() {
//construct components
jcomp1 = new JButton ("test1");
jcomp2 = new JButton ("test2");
jcomp3 = new JButton ("test3");
jcomp4 = new JTextField (5);
//adjust size and set layout
setPreferredSize (new Dimension (395, 156));
setLayout (null);
//add components
add (jcomp1);
add (jcomp2);
add (jcomp3);
add (jcomp4);
//set component bounds (only needed by Absolute Positioning)
jcomp1.setBounds (20, 45, 100, 25);
jcomp2.setBounds (135, 60, 100, 25);
jcomp3.setBounds (260, 35, 100, 25);
jcomp4.setBounds (105, 115, 100, 25);
}
public static void main (String[] args) {
JFrame frame = new JFrame ("MyPanel");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add (new MyPanel2());
frame.pack();
frame.setVisible (true);
}
}
If anyone could help I would appreciate it greatly!!
I have a lot of respect for you pros out there because if you are a pro at this, you are probably smarter than 99.9% of the world.
This stuff hurts my brain.

Here is something you can do, for this situation, where you have multiple Forms or Windows what you can do is to use a JPanel which can have this CardLayout set as it's LayoutManager and then you can add the two JPanels to it and access them with the methods provided by the same.
Don't use setBounds() when using Absolute Positioning this is really not the right way of putting components to the parent container. Instead use setLocation(...) and setSize(...) methods. Consider not to use Absolute Positioning as much as possible for you. Certain lines in favour of the before said line taken from Java Docs are as follows :
Although it is possible to do without a layout manager, you should use a
layout manager if at all possible. A layout manager makes it easier to
adjust to look-and-feel-dependent component appearances, to different
font sizes, to a container's changing size, and to different locales.
Layout managers also can be reused easily by other containers, as well as
other programs.
Since the output of your program is really not a soothing experience in any sense. Atleast LayoutManager, can make that work a lot more easier for you, since you need not have to specify position and size for each and every component. Try walking through the Layout Mangers Tutorials, and get accustomed to them as soon as possible. They are the real life savers :-)
Here is a modified code taken from your SOURCE CODE
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CardLayoutExample
{
private JPanel contentPane;
private MyPanel panel1;
private MyPanel2 panel2;
private void displayGUI()
{
JFrame frame = new JFrame("Card Layout Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel contentPane = new JPanel();
contentPane.setBorder(
BorderFactory.createEmptyBorder(5, 5, 5, 5));
contentPane.setLayout(new CardLayout());
panel1 = new MyPanel(contentPane);
panel2 = new MyPanel2();
contentPane.add(panel1, "Panel 1");
contentPane.add(panel2, "Panel 2");
frame.setContentPane(contentPane);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new CardLayoutExample().displayGUI();
}
});
}
}
class MyPanel extends JPanel {
private JTextField How;
private JLabel jcomp2;
private JLabel jcomp3;
private JButton jcomp4;
private JPanel contentPane;
public MyPanel(JPanel panel) {
contentPane = panel;
//construct components
How = new JTextField (1);
jcomp2 = new JLabel ("How long were you parked?");
jcomp3 = new JLabel ("Minutes");
jcomp4 = new JButton ("openNewWindow");
//adjust size and set layout
setPreferredSize (new Dimension (315, 85));
setLayout (null);
//set component bounds (only needed by Absolute Positioning)
How.setBounds (245, 50, 60, 25);
jcomp2.setBounds (35, 30, 185, 50);
jcomp3.setBounds (250, 30, 60, 20);
jcomp4.setLocation(0, 0);
jcomp4.setSize(315, 25);
jcomp4.addActionListener( new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
CardLayout cardLayout = (CardLayout) contentPane.getLayout();
cardLayout.next(contentPane);
}
});
//add components
add (How);
add (jcomp2);
add (jcomp3);
add (jcomp4);
}
}
class MyPanel2 extends JPanel {
private JButton jcomp1;
private JButton jcomp2;
private JButton jcomp3;
private JTextField jcomp4;
public MyPanel2() {
//construct components
jcomp1 = new JButton ("test1");
jcomp2 = new JButton ("test2");
jcomp3 = new JButton ("test3");
jcomp4 = new JTextField (5);
//adjust size and set layout
setPreferredSize (new Dimension (395, 156));
setLayout (null);
//set component bounds (only needed by Absolute Positioning)
jcomp1.setBounds (20, 45, 100, 25);
jcomp2.setBounds (135, 60, 100, 25);
jcomp3.setBounds (260, 35, 100, 25);
jcomp4.setBounds (105, 115, 100, 25);
//add components
add (jcomp1);
add (jcomp2);
add (jcomp3);
add (jcomp4);
}
}

Here is the code for myPanel class, use this one:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class MyPanel extends JPanel {
private JTextField How;
private JLabel jcomp2;
private JLabel jcomp3;
private JButton jcomp4;
public MyPanel() {
//construct components
How = new JTextField (1);
jcomp2 = new JLabel ("How long were you parked?");
jcomp3 = new JLabel ("Minutes");
jcomp4 = new JButton ("openNewWindow");
jcomp4.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
JFrame frame = new JFrame ("MyPanel");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add (new MyPanel2());
frame.pack();
frame.setVisible (true);
}
});
//adjust size and set layout
setPreferredSize (new Dimension (315, 85));
setLayout (null);
//add components
add (How);
add (jcomp2);
add (jcomp3);
add (jcomp4);
//set component bounds (only needed by Absolute Positioning)
How.setBounds (245, 50, 60, 25);
jcomp2.setBounds (35, 30, 185, 50);
jcomp3.setBounds (250, 30, 60, 20);
jcomp4.setBounds (0, 0, 315, 25);
jcomp4.addActionListener( new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
}
});
}
public static void main (String[] args) {
JFrame frame = new JFrame ("MyPanel");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add (new MyPanel());
frame.pack();
frame.setVisible (true);
}
}

How to place an object in a specific location (x,y) on a JFrame?

How can I place an object in a specific location (x,y) on a JFrame?

Here find the Absolute Positioning Tutorials. Please do read carefully, as to why this approach is discouraged over using LayoutManagers
To add say a JButton to your JPanel, you can use this :
JButton button = new JButton("Click Me");
button.setBounds(5, 5, 50, 30);
panel.add(button);
Here try this example program :
import java.awt.*;
import javax.swing.*;
public class AbsoluteLayoutExample
{
private void displayGUI()
{
JFrame frame = new JFrame("Absolute Layout Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel contentPane = new JPanel();
contentPane.setOpaque(true);
contentPane.setBackground(Color.WHITE);
contentPane.setLayout(null);
JLabel label = new JLabel(
"This JPanel uses Absolute Positioning"
, JLabel.CENTER);
label.setSize(300, 30);
label.setLocation(5, 5);
JButton button = new JButton("USELESS");
button.setSize(100, 30);
button.setLocation(95, 45);
contentPane.add(label);
contentPane.add(button);
frame.setContentPane(contentPane);
frame.setSize(310, 125);
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new AbsoluteLayoutExample().displayGUI();
}
});
}
}

Try these 2... in combination with each other...
setLocation() and setBounds()
Its even better to use GroupLayout, developed by NetBeans team in 2005. WindowsBuilder Pro is a good tool for Building Gui in java

Check out this absolute layout code sample:
Absolute Layout demo

In the class inheriting the frame:
setLayout(null);
In your component:
setLocation(x,y);