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Removing JFrame Border?

I have a Java Swing GUI and everything in my JFrame is offset by a few pixels. On MacOS, I had to offset everything by 12 pixels downward to account for it. On Windows, everything is shifted to the left and downward as well. I discovered that
setUndecorated(true);
removes the JFrame border (which I suspect is the cause of my problems) but it also removes the title bar.
Is there a way I can remove the JFrame border (or some other alternative to make sure everything is centered) and still keep the title bar? I need the title bar so that I can move the JFrame around and have the maximize/minimize/close functions.
Also, the layout is set to null in case that matters. (Everything I'm doing is pixel - based so I cannot set it to anything else).
Thanks.

I found a solution after Googling a bit more. Calling
getContentPane().setPreferredSize(...)
pack();
inside the JFrame constructor will adjust everything so that the titlebar and borders will not impact the view of the content pane.
For anyone else that may need this, you have to set the preferred size of the content pane specifically as that is what you want to appear correctly.
This way you can keep the titlebar and all the normal functionality of a JFrame window that you would otherwise lose with setUndecorated(true);.

The reason why you are adding 12px is because this is consume by the Title and border.
If you use setUndecorated(true) You will loose the title bar and you have to implement the addWindowListener to add a location changing of of an application.
The best way to do is:
Class Main{
public static void main(String[] args){
//JFrame
JFrame frame = new JFrame();
//Create a Main Panel and setPreferred Size and not set Size or set Bound
JPanel mainPanel = new JPanel(); //You value down
mainPanel.setPrefferedSize(new Dimension(x, y));
frame.add(mainPanel);
//and then in last add
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//the pack method help you to setSize of the JFrame According to the
//Component size
frame.pack();
frame.setVisible(true);
}
}

How to jump from a JFrame class after a specific time

I would like to go to jump from my progress bar (which is not an entirely progress just a gif) to another JFrame that would take me to the Login Frame after 5seconds but i don't want to use splash nor use buttons.
My Loading Frame source code :
public static void main(String[] args) {
JFrame frame = new JFrame("Loading");
frame.getContentPane().setBackground(Color.white);
ImageIcon loading = new ImageIcon("loading.gif");
frame.add(new JLabel("", loading, JLabel.CENTER));
frame.setSize(400,400); // dimensions of the gif.(800x600)
frame.setUndecorated(true); // removing the minimize and shit..
frame.setResizable(false);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
So basically after this code is executed for about 10 seconds it would jump to another class that contains another frame called login.java .

In general you can use a Swing Timer to schedule an event.
Read the section from the Swing tutorial on How to Use Swing Timers.
However, this is not the best solution!
i don't want to use splash
Why are you trying to reinvent the wheel? Use Swing the way it was designed to be used.
A splash screen is designed for this purpose and will initially load faster.
The splash screen can be configured to automatically close after the specified time.
Read the section from the Swing tutorial on How to Create a Splash Screen for a working example.

Java GUI Resize form after you create it

public static void main(String[] args) {
JFrame frame = new JFrame("Fantasy Football Toolkit");
frame.setContentPane(new GUI().mainPanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(350, 475);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
Above is the main method to my GUI application. I'm wondering if I can change the size of the form after this main method runs. What if I want to change the size when I click a button? The problem is that I can't access frame. This has to be possible one way or another. I have looked all over for a solution but can't find one. Thanks.

You can always access the top level JFrame from any component that it holds via SwingUtilities.getWindowAncestor(yourComponent). This method returns a Window object, but if you are 100% sure that it's a JFrame, you can always cast it (or test it first that this is so).
Once obtained, you can always call pack() on it to resize it to the preferred sizes of the components that it contains. In general you will want to avoid setting sizes directly as that can lead to bugs later on when you modify your program.

How to use JFrame properly?

So I started working on a project, and after some research of JFrame, I tried this to get my window for the project:
ImageIcon hello = new ImageIcon("C:\\Users\\JP\\Desktop\\hello.jpeg");
JFrame frame = new JFrame("Test");
frame.setSize(640,480);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
frame.setBackground(Color.GREEN);
frame.setIconImage(hello.getImage());
The frame comes up in it's correct size, but does not display the icon or have the correct background color.

If you are looking to change the background of your frame, you should take a look at this Setting background color of JFrame, but either way I recommend you use the design tab of window builder, because that can make your life much easier, and such stuff can be manipulated easily. (How to open a Java form in design view?)

How to make a window smaller than 125 x 50 in Java?

I'm trying to create a 50x50 window in Java but the window won't go smaller than 125x50, even if I try to manually resize it.
Here's my code currently:
import javax.swing.*;
public class smallwindow {
public static void main(String args[]) {
JFrame frame = new JFrame("");
frame.setSize(50, 50);
frame.setVisible(true);
}
}
I am running this with the latest version of Java on Mac OS X.
Is there any way to do this with a JFrame, or would I need to use something else, like maybe AWT?
**edit: is there a way to do this while retaining the titlebar, window management buttons, etc.?

You would have to do the following on the JFrame:
frame.setUndecorated(true);

Guys, I did a little more looking into it, apparently there is a method called setMinimumSize
Basically, all you need to do is add
Dimension minimumSize = new Dimension(50, 50);
frame.setMinimumSize(minimumSize);`
I've found that if the size is less than about 75x75, then resizing it will suddenly change the minimum width to around 75. The solution is to just to do frame.setResizable(false)
But anyways, thanks for all your help!

but is there anyway to do this such that you still retain the tilebar, window management buttons, etc.?
You can use the Metal LAF which includes the title bar:
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame(...);