Develop Reference

Adding Multiple Panels with Different Sizes in One Frame

I am trying to add more panels to my frame, but the program seems to ignore all the other panels than the first one I added. How should I add the panels?
I have checked other people's questions and their answers, but none of them seemed to be the solution to mine.
frame = new JFrame("Hey");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel mid = new JPanel(new GridLayout(7,7));
JPanel top = new JPanel();
frame.add(top);
frame.add(mid);
frame.pack();
frame.setVisible(true);
The program ignores the "top" panel, along with the buttons I added to it.

From the JFrame documentation:
The default content pane will have a BorderLayout manager set on it.
So you should use the BorderLayout regions in order to add your JPanels to the JFrame's content pane like this:
frame.add(top, BorderLayout.NORTH);
frame.add(mid, BorderLayout.CENTER);
Otherwise, the BorderLayout will default to adding everything to the CENTER region:
As a convenience, BorderLayout interprets the absence of a string specification the same as the constant CENTER:
Panel p2 = new Panel();
p2.setLayout(new BorderLayout());
p2.add(new TextArea()); // Same as p.add(new TextArea(), BorderLayout.CENTER);
and you will only see the JPanel added last because:
Each region may contain no more than one component

How to add a JPanel to a JFrame with Runnable method

When i create a JPanel and add it to my JFrame and add my canvas to it (space) it will show just the JPanel and not the any of the graphics. Why is it only showing the JPanel when i want it to show both of them at the same time?
Source Code:http://pastebin.com/Cw9E0a8j

If youre intent was to add the your canvas inside the jPanel you try change the following lines in your source
Original Code :
frame.add(p);
frame.add(space, BorderLayout.CENTER);
Suggested Code :
p.add(space);
frame.add(p, BorderLayout.CENTER);
If You are willing to view both JPanel and the canvas in the JFrame try giving positioning to the canvas also.But a different layout will do better. Try out the given example.
Original Code :
frame.setLayout(new BorderLayout());
frame.add(p);
frame.add(space, BorderLayout.CENTER);
Suggested Code 1 :
By providing the position to the JPanle in the Border Layout.
frame.setLayout(new BorderLayout());
frame.add(p, BorderLayout.NORTH);
frame.add(space, BorderLayout.CENTER);
Suggested Code 2 :
By Changing the Layout of the JFrame.
frame.setLayout(new GridLayout(0,2));
frame.add(p);
frame.add(space);
For more information please refer official documentation[1].
[1]. https://docs.oracle.com/javase/tutorial/uiswing/layout/index.html

The solution is very simple. In your code you are placing the 'space' in the center of the window, therefore you are telling it to take up the whole screen. What you should do is this.
frame.add(p, BorderLayout.EAST);//EAST for the rigth
frame.add(space, BorderLayout.WEST);//WEST for the left

How to add Swing Components to another JFrame?

Please help me to add Swing Components like JTable to already created JFrame Form using Netbeans

Take a look at this
JFrame frame = new JFrame();
frame.setSize(300,300);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTable table = new JTable(5, 5);
table.setBackground(Color.GRAY);
frame.setLayout(new FlowLayout());
frame.add(table);
The last two lines are the key in adding a component to a JFrame. You need to set a Layout that the Swing would be following in adding the component to the frame, then add the component.

Window size is wrong or not setting in Swing

This is my first swing application. I'm trying to create an window and add a button. On clicking the button, it should display some value on the console. Everythign works fine, but the window is very small. I've specified 800*600, but then also the window size is small, that is its wrapping the button size only.
Here is my code snippet:
JFrame frame = new JFrame("My Application");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container contentPane = frame.getContentPane();
contentPane.setLayout(new BorderLayout());
contentPane.add(new MyClass(), BorderLayout.CENTER);
frame.setSize(800, 600);
frame.pack();
frame.setVisible(true);
Snippet from MyClass.java:
setLayout(new GridBagLayout());
JButton button = new JButton("Button");
button.addActionListener(this);
add(button);
How to make the window size as 800*600?

The pack() method should always be called on a GUI based on a JFrame, so leave that in. It reduces the GUI to the smallest size needed to display the components in it. But don't go calling setSize(Dimension) after that, before checking it is larger than the minimum size.

Remove frame.pack(); from your code.
More information:
http://docs.oracle.com/javase/tutorial/uiswing/components/frame.html
http://docs.oracle.com/javase/6/docs/api/java/awt/Window.html#pack%28%29

You are calling pack method. The api said: "It causes this Window to be sized to fit the preferred size and layouts of its subcomponents"
You haven't specified the preferred size. Try it doing this:
frame.setPreferredSize(new Dimension(800,600));

Component on JPanel not showing in original size

I made a basic game on a JFrame and I'm currently trying to add a scoreboard on top my frame by using two separate JPanels. I tried to do it with WindowBuilder but the problem is that my GameFrame class component isn't shown fully in the game frame. It looks like this:
The code is as follows:
JFrame frame = new JFrame("Game");
frame.setSize(500, 700);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setResizable(false);
frame.setLocationRelativeTo(null);
frame.getContentPane().setLayout(null);
JPanel panel = new JPanel();
panel.setBounds(0, 100, 500, 600);
panel.add(new GameFrame());
frame.getContentPane().add(panel);
frame.setVisible(true);
How can I solve the problem?

A JPanel uses FlowLayout by default which respects preferred sizes. As its unlikely that this is currently overridden for your GameFrame component class, you need to use a layout manager which uses the maximum area available
panel.setLayout(new BorderLayout());

I think setting the layout to null is this issue. Set a proper Layout as shown below
frame.setLayout(new GridLayout(1,1));)

Have you tried one of these: http://docs.oracle.com/javase/tutorial/uiswing/layout/visual.html ?
If so, what's not working?
A BorderLayout could be useful if you want the scoreboard along the top, by using panel.add(new ScoreBoard(), BorderLayout.PAGE_START) for example.